FINAL REPORT TRN 0892

ANNUAL ENVIRONMENTAL REPORT TO THE DEPARTMENT OF WATER AND ENVIRONMENTAL REGULATION - LICENCE NO. 6498/1995/11 1 JANUARY TO 31 DECEMBER 2017

Fisher In-Pit Tailings Storage Facility Jundee Tailings Storage Facility and Nimary Tailings Storage Facility

JUNDEE OPERATIONS

REPORT NUMBER: N0103-19 - ver C

Prepared For

Northern Star Resources Limited Jundee Operations

March 2018

SAPROLITE PTY LTD (ACN 135 590 724) PO Box 2234 Ellenbrook WA 6069 Copies of Final Reports to: 52B Mornington Parkway Ellenbrook WA 6069 Department of Water and Environmental Regulation (1) Ph: 6296 7760 www.saprolite.com.au Northern Star Resources Ltd (e-copy) Fax: 6296 7762 [email protected] Saprolite Environmental (e-copy)

27 March 2018 Project No. N0103-19

Northern Star Resources Limited PO Box 2008 Subiaco WA 6904

Attention: Abraham van Niekerk – Senior Advisor Environment and Social Responsibility

Dear Abraham:

Subject: Northern Star Resources’ Jundee Operations Annual Environmental Report to the DWER, Licence No. 6498/1995/11 (Fisher In-Pit TSF, Jundee TSF and Nimary TSF) 1 January to 31 December 2017

We are pleased to provide Northern Star Resources’ Jundee Operations with the above final report, as per the distribution list on the cover.

On your behalf we have forwarded one hard copy (text double sided) of the report for the Department of Water and Environmental Regulation– Industry Regulation, attention Louise Lavery.

We thank you for the opportunity in working on this project and look forward to being of assistance in the future.

Should you have any queries about the report or any other matter, please do not hesitate to contact the undersigned

Yours faithfully SAPROLITE ENVIRONMENTAL

Rob Hollis Garth Richards Rob Hollis Garth Richards Project Environmental Scientist Senior Principal Consultant Managing Director cc.

Saprolite Pty Ltd ABN 43 135 590 724 PO Box 2234 Ellenbrook WA 6069 52B Mornington Parkway Ellenbrook WA 6069 Ph: (+61 8) 6296 7760 I Fax: (+61 8) 6296 7762 I Email: [email protected] 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

EXECUTIVE SUMMARY

Northern Star Resources’ Jundee Operation (Jundee) is located approximately 50km north-east of the Wiluna Township, in the North Eastern Goldfields of Western Australia, Figure 1. Jundee is owned and operated by Northern Star Resources Ltd (NSR), who acquired the operation in July 2014 from Newmont Mining Pty Ltd.

The project originally comprised two gold operations, Jundee and Nimary, which were amalgamated in 2001. The operation comprised two separate CIP processing plants, located within 4km of each other until the Nimary Plant was decommissioned on 3 July 2007.

Monitoring is undertaken to detect any impacts on the groundwater, to enable the operations to investigate and implement management strategies where required. As part of Jundee’s environmental and legal obligations routine water monitoring is undertaken at locations that have the potential to impact the environment. These locations include the Fisher In-Pit TSF, Jundee TSF, Nimary TSF, Mine Dewatering Discharge and the Bioremediation Landfarm. In addition, representative soil sampling at the Bioremediation Landfarm and at Jundee TSF1 is undertaken.

Water levels in monitoring bores around the Fisher In-pit TSF have risen historically, a pattern expected to be associated with groundwater mounding in response to tailings deposition. Monitoring bores have shown relatively stable water levels during the review period with the exception of FMB10, which had an unusually high groundwater measurement in September. Results from water chemistry analysis of bores around Fisher TSF showed pH ranging from 6.44 to 7.76, TDS values ranging from 301 to 14,240mg/L and WADCN was up to 0.008mg/L with some samples below the Practical Quantification Limit (PQL).

Water levels in monitoring bores around the Jundee TSF have fluctuated historically when in proximity to recovery bores likely a response to drawdown. Monitoring bores have exhibited a predominately stable water level trends in the majority of monitoring bores during 2017. Results from water chemistry analysis of bores around Jundee TSF showed pH ranging from 6.58 to 7.66; TDS values ranging from 263 to 5,160mg/L and WADCN was below the PQL for all analyses

All Nimary bores except NMB08 showed declining water levels during the review period, a continuation of the long term trend in Nimary bores. Results from water chemistry analysis of bores around Nimary TSF showed pH ranging from 6.97 to 7.5, TDS values ranging from 510 to 3,480mg/L and WADCN was up to 0.005mg/L with most analyses too low to be measured.

All monitoring was conducted in accordance with the licence conditions during the review period. A few monitoring omissions due to operational limitations such as bores being dry. The exception was an administration error that omitted the analysis of fluoride at two locations in March.

SAPROLITE ENVIRONMENTAL I 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations TABLE OF CONTENTS

EXECUTIVE SUMMARY ...... 1 1. INTRODUCTION ...... 1 1.1 Background and General Site Description ...... 1 1.2 Monitoring Background ...... 2 2. LICENSING...... 3 2.1 Monitoring Requirements ...... 3 3. PRODUCTION VOLUMES ...... 7 3.1 Tailings Recovery Water ...... 7 3.2 Seepage Recovery Bores ...... 8 4. WATER LEVELS ...... 10 4.1 Fisher In-Pit Tailings Storage Facility ...... 10 4.2 Jundee Tailings Storage Facility ...... 11 4.3 Nimary Tailings Storage Facility Monitoring Bores ...... 13 5. ANALYTICAL RESULTS – WATER AND SOIL ...... 14 5.1 Fisher In-Pit Tailings Storage Facility Water Monitoring ...... 14 5.2 Jundee Tailings Storage Facility Water Monitoring ...... 16 5.3 Nimary Tailings Storage Facility Water Monitoring ...... 20 5.4 Mine Dewatering Monitoring ...... 21 5.5 Jundee Bioremediation Landfarm Water Monitoring ...... 23 5.6 Jundee Bioremediation Landfarm Soil Sampling ...... 23 6. GAS GENERATOR EMISSIONS ...... 24 7. LICENCE COMPLIANCE ...... 25 7.1 Incident and Exceedance Reporting...... 25 7.2 Monitoring Requirement ...... 26 7.3 Improvements ...... 27 7.4 Complaints ...... 27 8. RECOMMENDATIONS ...... 28 8.1 Licence Requirements and definitions ...... 28 8.2 Fisher In-Pit Tailings Storage Facility ...... 28 8.3 Jundee Tailings Storage Facility ...... 28 8.4 Nimary Tailings Storage Facility ...... 28 8.5 Barton Mine Dewatering ...... 28 8.6 Jundee Bioremediation Landfarm Soil Sampling ...... 28 9. REFERENCES ...... 29

SAPROLITE ENVIRONMENTAL 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations LIST OF TABLES, FIGURES AND APPENDICES TABLES Table 2.1 Jundee Licensing ...... 3 Table 2.2 Groundwater Monitoring Requirements ...... 4 Table 2.3 Inputs and Outputs Monitoring Requirements ...... 5 Table 2.4 Soil Monitoring ...... 5 Table 2.5 Air Emissions ...... 6 Table 3.1 TSF Deposition and Tailings Return (kL) – 2017 ...... 7 Table 3.2 Fisher TSF – Recovery Bore Abstraction 2017(kL) ...... 8 Table 3.3 Jundee TSF – Recovery Bore Abstraction 2017(kL) ...... 9 Table 4.1 Fisher In-Pit Tailings Storage Facility Water Levels ...... 10 Table 4.2 Jundee TSF Bores – Potentiometric Levels ...... 12 Table 4.3 Nimary TSF Bores - Potentiometric Levels...... 13 Table 5.1 Fisher In-Pit TSF – Laboratory Analysis (mg/L) ...... 15 Table 5.2 Fisher In-Pit TSF – Field Measurements ...... 15 Table 5.3 Jundee Compliance Bores – Laboratory Analysis (mg/L) ...... 17 Table 5.4 Jundee Compliance Bores – Field Measurements ...... 18 Table 5.5 Nimary TSF Compliance Bores – Laboratory Analysis (mg/L) ...... 20 Table 5.6 Nimary TSF Compliance Bores – Field Measurements ...... 20 Table 5.7 Mine Dewatering Water Quality Laboratory Analysis* ...... 22 Table 5.8 Bioremediation Bores Water Quality Laboratory Analysis (μg/L) ...... 23 Table 5.9 Bioremediation Soil Analysis - 2017 (mg/kg) ...... 23 Table 6.1 Gas Generator Emissions Testing ...... 24 Table 7.1 Annual Environmental Report Inclusions ...... 25 Table 7.2 Site Incidents 2017 ...... 25 Table 7.3 Monitoring Compliance Summary ...... 26 Table 7.4 Monitoring Omissions ...... 27

FIGURES Figure 1 Regional Location Plan ...... N0100-001 Figure 2 Project Area Plan ...... N0100-002 Figure 3 Fisher In-Pit Tailings Storage Facility – Bore Location Plan ...... N0100-010 Figure 4 Jundee Tailings Storage Facility – Bore Location Plan ...... N0100-007 Figure 5 Nimary Tailings Storage Facility – Bore Location Plan ...... N0100-008 Figure 6 Jundee-Nimary Mining Area Plan ...... N0100-005 Figure 7a Jundee Plant Raw and Potable Water Schematic ...... N0100-068 Figure 7b Jundee-Nimary Mine Dewatering Circuit Schematic...... N0100-127 Figure 8 Fisher In-Pit Tailings Storage Facility – Potentiometric Levels as at Dec 2017 ...... N0100-316 Figure 9 Fisher In-Pit Tailings Storage Facility – Water Depths (mbgl) - Dec 2017...... N0100-317 Figure 10 Jundee Tailings Storage Facility – Potentiometric Levels as at Dec 2017 ...... N0100-319 Figure 11 Jundee Tailings Storage Facility – Water Depths (mbgl) - Dec 2017 ...... N0100-320 Figure 12 Nimary Tailings Storage Facility – Potentiometric Levels as at Dec 2017...... N0100-322 Figure 13 Nimary Tailings Storage Facility – Water Depths (mbgl) - Dec 2017...... N0100-323 Figure 14 Fisher In-Pit Tailings Storage Facility – Groundwater Salinity as at Dec 2017 ...... N0100-318 Figure 15 Jundee Tailings Storage Facility – Groundwater Salinity as at Dec 2017 ...... N0100-321 Figure 16 Nimary Tailings Storage Facility – Groundwater Salinity as at Dec 2017 ...... N0100-324

APPENDICES Appendix A Glossary Appendix B Bore Construction Details Appendix C DER Licence 6498/1995/11 Appendix D Jundee Plant Description Appendix E Bore Hydrographs Appendix F Historical Water Levels Appendix G Historical Water Chemistry Appendix H Point Sour Air Emissions Report Appendix I Field Equipment Calibration Records and Procedures

SAPROLITE ENVIRONMENTAL 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

DOCUMENT REVISION HISTORY Revision Status Revision Revision Comments Primary Reviewer Approved Number Date Author A Draft 15/03/2018 First pass internal review R.Hollis G.Richards - A Draft 16/03/2018 Report issued for client review R.Hollis A. Shelton G.Richards B Draft 26/03/2018 Addressed client comments R.Hollis A. vanNiekerk G.Richards C Final 27/03/2018 Report issued as final R.Hollis - G.Richards

STATEMENT OF LIMITATIONS Aquifer materials and groundwater flow systems are a product of continuing natural and man- made processes and thus exhibit a variety of characteristics and properties that vary from place to place and can change with time. Geology/hydrogeology involves gathering and assimilating limited facts about these characteristics and properties in order to understand and predict the behaviour of the ground on a particular site under certain conditions. This report may contain such facts obtained by inspection, drilling, excavation, probing, sampling, testing or other means of investigation, particularly pumping and drawdown data. If so, they are directly relevant only to the groundwater system at the place where, and the time when the investigation was carried out. Any groundwater modelling predictions presented should not be regarded as matters of fact.

This report and other reports referred to contain comments on works being carried out by others. Saprolite Environmental cannot and will not take responsibility for works carried out by others on site to date. We do not guarantee the performance of the project in any respect, only that our work and judgement meet the standard of care of our profession at this time.

Any interpretation or recommendation given in this report shall be understood to be based on judgement and experience, not on greater knowledge of facts other than those reported. The interpretation and recommendations are therefore opinions provided for the Client's sole use in accordance with a specific brief. As such they do not necessarily address all aspects of the groundwater system on the subject site.

© Saprolite Pty Ltd, 2018.

This document may not be reproduced in part or whole by electronic, mechanical or chemical means, including photocopying, recording or any information storage system, without the express approval of Saprolite Pty Ltd and/or Northern Star Resources Ltd (Jundee Operations). Neither this document nor its contents may be referred to or quoted in any manner, report or other document without the express approval of Saprolite Pty Ltd and/or Northern Star Resources Ltd (Jundee Operations).

Additional copies and or enquiries about this document should be addressed to The Principal, Saprolite Environmental, PO Box 2234 Ellenbrook, WA, 6069 or by email to [email protected] SAPROLITE ENVIRONMENTAL 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

1. INTRODUCTION

Northern Star Resources’ Jundee Operation (Jundee) is located approximately 50km north- east of the Wiluna Township, in the North Eastern Goldfields of Western Australia, Figure 1. Jundee is owned and operated by Northern Star Resources Ltd (NSR), who acquired the operation in July 2014 from Newmont Mining Pty Ltd. In accordance with licence condition, 5.2.1, an Annual Environmental Report (AER) is to be submitted to the Department of Water and Environmental Regulation (DWER) by 31 March 2018. Saprolite Environmental were engaged by Jundee to compile and prepare such a report, to assess Jundee’s performance in relation to the licence, and report any variations to the monitoring, and any non-compliance. The review period of this AER is 12-months from 1 January to 31 December 2017. This report presents all required monitoring data collected at the site during the review period as per the prescribed monitoring schedules outlined within the licence 6498/1995/11 and its subsequent amendment dated 4 August 2016. All incident or licence breach reports are also summarised including feedback and discussions to address the likelihood of reoccurrence. All monitoring data presented in this report has not been verified for accuracy against original data sheets or laboratory reports. The data is presented ‘as is’ and is sourced by Jundee from their Monitor Pro 5 (MP5) database, electronic files, and field data sheets. A glossary of units and terms is presented in Appendix A, and basic bore details (including new and former bore nomenclature) are provided in Appendix B.

1.1 Background and General Site Description

The project originally comprised two gold operations, Jundee and Nimary, which were amalgamated in 2001. The operation comprised two separate CIP processing plants, located within 4km of each other until the Nimary Plant was decommissioned on 3 July 2007. Raw water is supplied to the Jundee Plant from the Sandhill Well and Dingo Borefields, located 14km northeast of the Plant, as well as from water abstracted during mine dewatering activities. Potable water for the Jundee Plant and Village is supplied from a number of bores located on the north, east and south eastern side of the mining areas, known as the Village Potable Borefield, Figures 1 and 2. Tailings from the Jundee processing facility are discharged to three Tailing Storage Facilities (TSFs): the Fisher In-Pit TSF; and two paddock style TSFs, TSF1 and TSF2. The Fisher In- Pit TSF, Figure 3 is an abandoned open pit that was commissioned as a TSF in July 2004. It had an initial projected capacity to the year 2008, however due to selective discharge at the facility during summer months it is still in use as an alternative discharge point. TSFs 1 and 2 are paddock style upstream embankment TSFs, Figure 4. TSF1 commenced operation in December 1996 and ceased operation in November 1999. An embankment lift on TSF1 was approved and constructed in 2016 and TSF1 was recommissioned on 6 August 2017. TSF2 commenced operation in November 1999 and underwent two wall lifts in 2012 and 2015. TSF2 was utilised as the primary TSF until TSF1 was recommissioned in 2017.

SAPROLITE ENVIRONMENTAL 1 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Prior to closure, the Nimary Plant undertook gold processing and refining activities and tailings wastes were discharged to the nearby Nimary Tailings Storage Facility. The Nimary TSF was fully rehabilitated in 2009, Figure 5. Mine dewatering has been ongoing as part of the normal mining activities for a number of years. Dewatering of Barton Underground (Barton Level 4 Clean Dam) is discharged via the Main Pit to two areas: x Barton Turkey Nest for water to be returned to the Barton Underground for mining activities, x Water pumped to the Main Line where it is distributed to the Raw Water Tank or Jundee Process Water Dam.

The Jundee-Nimary Mining Area Plan is presented as Figure 6.

The disposal of hydrocarbon contaminated soil wastes occurs at the Jundee Bioremediation Landfarm – 600m north east of the Jundee Plant. Soil sampling sites are required to be monitored as part of the DWER licence conditions. In addition three shallow piezometers are installed around the perimeter of the landfarm which are also required to be monitored as part of DWER licence conditions. These are located as follows: x JHMB1 – southern side of landfarm, next to entrance; depth 9.9m x JHMB2 – eastern side of landfarm; depth 11.1m x JHMB3 - northern side of landfarm, closest to the TSF1; depth 10.1m

1.2 Monitoring Background

The monitoring of groundwater and surface water at Jundee is undertaken by personnel from the Jundee Environment Department. The monitoring data and laboratory results are collated and entered into Jundee’s environmental data management database Monitor Pro 5 (MP5).

Jundee Operations prepared a Standard Operating Procedure (SOP) in 2009 for Monitor Bore Sampling based on information contained within a previously prepared Sampling Measurement and Analysis Plan (SMAP) (Rich Consulting Services, 2006). The SOP was reviewed and updated throughout 2015 and the final document controlled version was uploaded to NSR’s system in January 2016. This SOP provides specific work instructions for the types of equipment used on site, and complies with site requirements in addressing all elements of the sampling procedure, including linking to other documents, such as plans, field sheets, checklists, equipment use procedures and equipment calibration. The procedure is tracked on NSR’s INX document control system to be reviewed every 2 years.

Water and soil sampling are carried out in accordance with standards, as per Condition 3.1.1 of the Licence to Operate Amendment: x AS/NZS 5667.1 for water sampling and standards x AS/NZS 5667.10 for waste water sampling x AS/NZS 5667.11 for groundwater sampling x AS 4482.1 and AS 4482.2 for soil sampling,

Point source air emission sampling is carried out in accordance with standards, as per Condition 3.2.2 of the Licence to Operate Amendment: x AS 4323.1

SAPROLITE ENVIRONMENTAL 2 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

2. LICENSING

The Department of Water and Environmental Regulation (DWER) was established by the Government of Western Australia on 1 July 2017. It is a result of the amalgamation of the Department of Environment Regulation (DER), Department of Water (DoW) and the Office of the Environmental Protection Authority.

The current licence to operate (LTO) (6498/1995/11) was issued as an amendment on 04 August 2016 and is presented in Appendix C. The licence is summarised in Table 2.1, and covers monitoring requirements for Jundee TSF2, Nimary TSF and Fisher In-Pit TSF.

Table 2.1 Jundee Licensing Licence Location Date Expiry Classification of Premises Allowable No. Granted Date Throughput Licence to NSR Jundee 22-Nov-13 21-Nov-24 Category 05 – Processing or Beneficiation of 3.0 Mtpa Operate Operations Metallic and Non Metallic Ore Category 06 – Mine dewatering 3.0 Mtpa 6498/1995/ 11 Category 52 – Electric Power Generation 42.21MW

Category 54 – Sewage Facility 150m3/d Category 64 – Class II or III Putrescible 600tpa Landfill Site Category 73 – Bulk Storage of Chemicals 10,000m3

2.1 Monitoring Requirements

The Licence to Operate L6498/1995/11 prescribes monitoring requirements under Section 3 which relates to groundwater monitoring, mine dewatering discharge and soil monitoring.

Groundwater Monitoring – Jundee TSF, Fisher In-Pit TSF, Nimary TSF

There are three areas listed in the licence that require groundwater levels and water quality to be monitored: x Jundee TSF (Recovery Bores, Seepage Indication Bores, Compliance Bores); x Fisher Pit Tailings Storage Facility (Monitoring bores, Recovery Bores); and x Nimary TSF (Seepage Indication Bores, Compliance Bores).

Groundwater quality analysis is also required from three shallow piezometers located around the bioremediation land-farm. Table 3.4.1 of L6498/1995/11 (August 2016 amendment) is reproduced below as Table 2.2 and describes the sites, measurements and frequencies of groundwater monitoring required.

SAPROLITE ENVIRONMENTAL 3 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 2.2 Groundwater Monitoring Requirements (Table 3.4.1 Monitoring of ambient groundwater quality3) Monitoring point reference and Averaging Parameter Limit Units Frequency location period Jundee (TSF1 & 2 ) Recovery Bores JRB01, JRB02, JRB03, JRB05, SWL1 - m(AHD) Spot Monthly JRB06, JRB07, JRB08, JRB09, sample JRB10, JRB11, JRB12, JRB13, JRB14, JRB15 Jundee (TSF1 & 2 ) Seepage Indication Bores JMB17, JMB01-D, JMB04-D, SWL1 - m(AHD) Spot Quarterly JMB07-D, JMB08-D, JMB09-D, sample JMB10-S, JMB10-D, JMB14-D, JMB15-D, JMB16-D Jundee (TSF1 & 2 ) Compliance Bores JMB05-S, JMB05-D, JMB06-S, SWL1 - mbgl Spot Quarterly JMB06-D, JMB23A, JMB24 sample JMB11-S, JMB11-D, JMB19, >1 JMB20 JMB12-S, JMB12-D, JMB13-S, >1 JMB13-D, JMB25, JMB26, JMB27, JMB28, JMB29 JMB05-D, JMB06-D, JMB11-D, pH2 6.0 - 9.0 - JMB12-D, JMB13-D, JMB19, Total dissolved solids2 <14 000 mg/L JMB20, JMB21, JMB22, Weak Acid Dissociable <0.5 mg/L JMB23A, JMB24, JMB25, Cyanide (WAD CN) JMB26, JMB27, JMB28, JMB29 Dissolved metals - As, Cd, - mg/L Cu, Hg, Ni, Pb, Zn Fisher In-Pit TSF Monitoring Bores FMB04, FMB05, FMB09, SWL1 - m(AHD) Spot Quarterly FMB10, FMB11 pH2 - - sample Total dissolved solids2 - mg/L Weak Acid Dissociable - mg/L Cyanide (WAD CN) Dissolved metals - As, Cd, - mg/L Cu, Hg, Ni, Pb, Zn FMB12 SWL1 - m(AHD) Spot Quarterly sample Fisher In-Pit TSF Seepage Recovery Bores FRB01, FRB04, FRB05 SWL1 - m(AHD) Spot Quarterly sample Nimary TSF Seepage Indication Bores NMB01-D, NMB02-D, NMB03-D SWL1 - m(AHD) Spot Annually sample Nimary TSF Compliance Bores NMB04-D, NMB07-D, NMB08- SWL1 - m(AHD) Spot Annually D, NMB09-D, NMB10-D, pH2 6.0 - 9.0 - sample NMB10-S Total dissolved solids2 <14 000 mg/L Weak Acid Dissociable <0.5 mg/L Cyanide (WAD CN) Dissolved metals - As, Cd, - mg/L Cu, Hg, Ni, Pb, Zn Bioremediation Landfarm JHMB01, JHMB02, JHMB03 TRH - mg/L Spot Annually Sample Note 1: SWL shall be determined prior to collection of other water samples. Note 2: Non-NATA in field measurement of pH and TDS permitted. Note 3: A minimum of 90% of all bores listed in Table 3.3.1 will be sampled during any quarterly period to allow for maintenance and operational constraints.

SAPROLITE ENVIRONMENTAL 4 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Water Monitoring – Mine Dewatering Discharge

Dewatering discharge into Barton Level 4 Clean Dam and Main Pit Receiving Water Body from the underground mining areas is required to be sampled, for laboratory analysis, quarterly. The monitoring requirements are as per Table 3.3.1 in Section 3 of L6498/1995/11, reproduced as Table 2.3 below.

Table 2.3 Inputs and Outputs Monitoring Requirements (Table 3.3.1 Monitoring of inputs and outputs) Averaging Input/Output Parameter Units Frequency period Tailings deposition Volume of tailings deposited to TSF2 and m3 monthly Cumulative Fisher In-pit TSF monthly total Volume of tailings supernatant liquor returned to process plant from TSFs Volume of seepage recovered Mine dewater Volume m3 monthly Cumulative discharged to monthly total dam/pit Barton Level 4 pH - spot sample Quarterly Clean Dam Total dissolved solids mg/L Total recordable hydrocarbons mg/L Total phosphorus, total nitrogen mg/L Sodium, potassium, calcium, magnesium, mg/L chloride, carbonate, bicarbonate, sulfate, nitrate, fluoride, silica Aluminium, arsenic, boron, cadmium, mg/L iron, mercury, nickel, lead, zinc Main pit receiving pH - spot sample Quarterly water body Total dissolved solids mg/L Total recoverable hydrocarbons mg/L Total phosphorus, total nitrogen mg/L Sodium, potassium, calcium, magnesium, mg/L chloride, carbonate, bicarbonate, sulfate, nitrate, fluoride, silica Aluminium, arsenic, boron, cadmium, mg/L iron, mercury, nickel, lead, zinc

Condition 3.4.1, Table 3.4.2 outlines the requirement for soil sampling and analysis from the Bioremediation Landfarm. Sampling is to be conducted in accordance with AS 4482.1 and AS 4482.2 and to be sampled at the frequencies and for the parameters listed in Table 3.4.2, reproduced as Table 2.4 below.

Table 2.4 Soil Monitoring (Table 3.4.2 Monitoring of ambient soil quality) Monitoring point reference and location Parameter Units Averaging period Frequency Landfarm TRH mg/kg Spot Sample Six Monthly TSF1 TRH mg/kg Spot Sample Six Monthly

SAPROLITE ENVIRONMENTAL 5 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Section 3.2 outlines the requirement for monitoring of point source emissions once the new power house is commissioned. Specific analysis are outlined in section 3.2.1, Table 3.2.1, reproduced as Table 2.5 below.

Table 2.5 Air Emissions (Table 3.2.1: Monitoring of point source emissions to air) Emission point Parameter Units1 Frequency2 Method reference

New Gas Gensets Volumetric flow rate m3/s n/a USEPA Method 2 Quarterly for first Modified USEPA Oxides of nitrogen (NOx) 12 months of Method 7E mg/m3 operation Modified USEPA Carbon monoxide (CO) Method 10 Note 1: All units are referenced to STP dry. Note 2: Monitoring shall be undertaken to reflect normal operating conditions and any limits or conditions on inputs or production.

SAPROLITE ENVIRONMENTAL 6 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

3. PRODUCTION VOLUMES

3.1 Tailings Recovery Water

Water discharged to the TSFs as tailings slurry is recovered through decant of tailings ponds, and recovery bores. Water recovery is also undertaken from a seepage interception drain and pond system at TSF2. Recovered water is pumped back to the process water dam either directly or indirectly via the seepage ponds or recovery dams. Flow diagrams of the Jundee water circuits are provided as Figures 7a and 7b. A description of the Jundee Plant is provided in Appendix D.

Fisher TSF was only utilised in April and May 2017, TSF2 was utilised from January until August 2017 and TSF1 was utilised from August to December 2017. Tailings discharge water content and tailings return water volumes are presented in Table 3.1.

A total of 1,683,640 tonnes of ore (dry weight) was milled and discharged as waste to TSFs during 2017, which is 56% of the 3,000,000 tonnes allocated within the licence 6498/1995/11. Tailings discharge water content and tailings return water volumes are presented in Table 3.1.

Table 3.1 TSF Deposition and Tailings Return (kL) – 2017 Jundee TSF1 Jundee TSF2 Fisher In-Pit TSF Combined Tailings Tailings Tailings Tailings Discharge: Tailings Discharge: Tailings Discharge: Tailings Discharge: Tailings % Month Water Return Water Return Water Return Water Return Recovery Content Content Content Content January 0 0 215,754 76,363 0 2,130 215,754 78,493 36% February 0 0 188,652 93,479 0 1,970 188,652 95,449 51% March 0 0 211,374 47,431 0 2,180 211,374 49,611 23% April 0 0 53,840 36,884 138,444 75,610 192,284 112,494 59% May 0 0 139,992 23,816 72,696 112,850 212,688 136,666 64% June 0 0 228,783 113,045 0 5,850 228,783 118,895 52% July 0 0 190,145 88,904 0 2,530 190,145 91,434 48% August 219,526 0 0 96,663 0 2,540 219,526 99,203 45% September 219,396 133,351 0 0 0 2,330 219,396 135,681 62% October 228,463 135,046 0 0 0 2,530 228,463 137,576 60% November 212,379 139,842 0 0 0 2,490 212,379 142,332 67% December 258,415 120,541 0 0 0 2,580 258,415 123,121 48% TOTAL 1,138,179 528,780 1,228,539 576,585 211,140 215,590 2,577,859 1,320,955 51% # Tailings return includes decant and groundwater recovery.

In 2017, 16% of the total tailings discharge water was reclaimed from Fisher TSF, 40% was reclaimed from TSF1 and 44% was reclaimed from TSF2. It should be noted that water reclaimed from recovery bores does not necessarily reflect seepage from recent deposition. Furthermore, the volume of water abstracted does not take into account interception of rainfall or evaporation losses. A total of 1,320,955kL of water was recovered during the review period.

SAPROLITE ENVIRONMENTAL 7 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 3.2 Seepage Recovery Bores

There are currently two equipped recovery bores (FRB05, and FRB04) located on the western perimeter of the Fisher In-Pit TSF. These replaced FRB02 and FRB03 which collapsed in 2007 and 2008 respectively. A third recovery bore (FRB01) partially collapsed in July 2011 and is unable to be equipped. An intended replacement bore, drilled in November 2012, was dry and abandoned (Saprolite, 2012c). FRB01 is currently in use as a monitor bore.

Abstraction volumes from FRB04 and FRB05 for 2017 are presented in Table 3.2. FRB04 averaged 80kL/d during 2017. FRB05 averaged 4kL/d during 2017. No abstraction from FRB05 was recorded between January and August 2017.

Table 3.2 Fisher TSF – Recovery Bore Abstraction 2017(kL) Month FRB05 (FMB2A) FRB04 (FMB3A) Total January 0 2,291 2,291 February 0 2,075 2,075 March 0 2,141 2,141 April 0 2,459 2,459 May 0 2,960 2,960 June 0 2,851 2,851 July 0 2,766 2,766 August 0 2,672 2,672 September 5 2,345 2,350 October 609 2,146 2,755 November 487 2,119 2,606 December 525 2,372 2,897 Totals (kL) 1,626 29,197 30,823 Daily Av kL/d 4 80 84

Seepage recovery from Jundee TSFs 1 and 2 is currently via 15 recovery bores JRB01 to JRB15. JRB01, JRB02 and JRB03 are located on the eastern wall of TSF1 and have been used for recovery since 2003. JRB04, JRB05, JRB06, JRB07 and JRB08 were converted from seepage monitoring bores in 2008. JRB09 and JRB10 were constructed in 2007 and commenced abstracting in 2008 at the same time as JRB04 to JRB08. Five additional recovery bores were commissioned in June 2014, JRB11, JRB12, JRB13, JRB14 and JRB15, with original drilling completed in 2012 as part of the Groundwater Recovery Seepage Mitigation Plan (GRSMP). All recovery bores are solar operated, with the exception of JRB1, 2 and 3.

Seepage recovery from Jundee TSF bores JRB01 to JRB15 in 2017 was 32% lower than seepage recovery from 2016. Average abstraction rates ranged from 4kL/d (JRB01) to 54kL/d (JRB03). Monthly recovery volumes ranged from 10,691kL (average 345kL/d) in May 2017 to 15,951kL (average 515kL/d) in December 2017. Six bores (JRB02, JRB04, JRB05, JRB08. JRB09 and JRB11) all had months of zero abstraction during 2017.

Monthly abstraction from recovery bores are presented on hydrographs, Appendix E, for comparison with water levels.

SAPROLITE ENVIRONMENTAL 8 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 3.3 Jundee TSF – Recovery Bore Abstraction 2017(kL) JRB01 JRB02 JRB03 JRB04 JRB05 JRB06 JRB07 JRB08 Month (JTP2) (JTP3) (JTP4) (JTP6) (JTP7) (JTP10) (JTP11) (JTP12) January 79 0 1,377 535 1,537 1,294 903 1,036 February 73 0 1,542 410 1,759 1,130 303 1,049 March 88 0 1,713 477 1,043 599 209 1,078 April 79 0 1,615 316 1,143 1,043 621 1,018 May 86 0 1,731 0 0 1,286 394 1,116 June 79 0 1,619 382 750 1,168 747 930 July 81 0 1,627 495 1,286 1,304 792 1,060 August 91 0 1,788 518 1,193 792 836 1,052 September 90 0 1,762 277 1,065 576 933 1,179 October 93 760 1,798 643 93 1,703 994 885 November 96 1,001 1,366 0 613 1,551 888 0 December 406 2,561 1,759 511 913 1,615 929 986 Totals (kL) 1,341 4,322 19,697 4,564 11,395 14,061 8,549 11,389 Daily Av kL/d 4 12 54 13 31 39 23 31

Table 3.3 Jundee TSF – Recovery Bore Abstraction 2017(kL) continued JRB09 JRB10 Total Month JRB11 JRB12 JRB13 JRB14 JRB15 (JTP15) (JTP16) Jundee January 747 1,839 1,320 473 1,594 1,295 388 14,417 February 0 1,771 1,262 441 1,495 1,244 375 12,854 March 776 1,867 1,282 534 1,465 748 381 12,260 April 1,038 1,763 1,026 503 1,156 1,135 355 12,811 May 1,072 1,365 1,276 511 1,423 65 366 10,691 June 776 1,141 1,141 425 1,188 1,008 331 11,685 July 325 1,659 1,248 647 1,341 1,116 381 13,362 August 1,026 1,306 1,279 792 1,357 1,128 420 13,578 September 1,160 1,442 809 584 1,503 855 460 12,695 October 1,246 571 54 981 1,591 420 504 12,336 November 1,123 624 0 919 1,494 990 446 11,111 December 1,128 81 796 975 1,552 1,275 464 15,951 Totals (kL) 10,417 15,429 11,493 7,785 17,159 11,279 4,871 153,751 Daily Av kL/d 29 42 31 21 47 31 13 421

SAPROLITE ENVIRONMENTAL 9 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

4. WATER LEVELS

4.1 Fisher In-Pit Tailings Storage Facility

Water levels were measured quarterly from bores FMB04, FMB05, FMB09, FMB10, FMB11, FRB01, FRB05, FRB04 and FMB12 in compliance with the licence to operate, Table 2.2.

Water levels in metres above the Australian Height Datum (mAHD) are plotted on time-series hydrographs, Appendix E, and historical water measurements in metres below top of casing (mbtoc) and mAHD are presented in Appendix F. Interpreted potentiometric contours of water levels in metres below ground level (mbgl) and mAHD are presented as Figures 8 and 9 respectively. Table 4.1 shows comparative water level measurements after initial construction (2004), in December 2016 and December 2017.

Hydrographs show water levels in monitoring bores around the Fisher In-pit TSF have historically risen, A pattern expected to be associated with groundwater mounding in response to tailings deposition.

Waters levels in recovery bores have historically fluctuated with abstraction, demonstrated most notably in FRB01, which has shown a consistent trend since abstraction ceased in 2011. FRB05 was dry in June and September and FRB04 was dry in March. Historically FRB05 and FRB04 have had similar water level trends and water levels in FRB04 were substantially lower in June, September and November. The close proximity of FRB04 and FRB05 increases the likelihood of interference between them and abstraction rates in either bore could be affected by pump efficiencies in both.

Monitoring bores have shown relatively stable water levels during the review period, hydrographs E4 to E12, with the exception of FMB10, which had an unusually high groundwater measurement in September. It is expected that water level changes within monitoring bores are more representative of groundwater changes as they are not subject to direct pumping influence. However, individual measurements can be influenced by pumping activity in nearby recovery bores.

Table 4.1 Fisher In-Pit Tailings Storage Facility Water Levels Initial Change to December 2016 December 2017 2017 WL (m) Ground +Rise/- Fall Bore Level RL Water Water Water Water Water Water Since (mAHD) Since Date Depth Level Depth Level Depth Level Dec Initial (mbgl) (mAHD) (mbgl) (mAHD) (mbgl) (mAHD) 2016 FRB01 554.36 Jul 2004 81.90 472.46 34.70 519.66 34.61 519.75 47.29 0.09 FRB05 554.26 Jul 2004 71.18 483.08 N/A N/A 60.78 493.48 10.40 N/A FRB04 551.95 Jul 2004 55.75 496.20 N/A N/A 61.07 490.88 -5.32 N/A FMB04 553.55 Jul 2004 66.24 487.31 14.82 538.73 12.90 540.65 53.34 1.92 FMB05 555.92 Mar 2006 57.98 497.94 44.22 511.70 48.97 506.95 9.01 -4.75 FMB09 552.82 Jul 2004 50.46 502.36 19.28 533.54 18.28 534.54 32.18 1.00 FMB10 553.06 Oct 1997 69.50 483.56 23.09 529.97 21.88 531.18 47.62 1.21 FMB11 553.04 Jan 2005 44.46 508.58 23.30 529.74 19.85 533.19 24.61 3.45 FMB12 554.73 Jan 2005 47.41 507.32 12.07 542.66 11.83 542.90 35.58 0.24 N/A not available

SAPROLITE ENVIRONMENTAL 10 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 4.2 Jundee Tailings Storage Facility

Water levels were measured quarterly (in February, June, September and December) at Jundee TSF seepage indication and compliance bores and monthly at recovery bores, as per the licence conditions outlined in Table 2.2. Of 30 monitoring bores measured, only one shallow bore (JMB06-S) was dry during 2017.

Water levels in metres above the Australian Height Datum (mAHD) are plotted on time-series hydrographs, Appendix E, and historical water measurements in metres below top of casing (mbtoc) and mAHD are presented in Appendix F. Interpreted potentiometric contours of water levels in metres below ground level (mbgl) and mAHD are presented as Figures 10 and 11 respectively. Table 4.2 shows comparative water level measurements shortly after construction (initial), in December 2016 and December 2017.

Hydrographs show predominately stable water level trends in the majority of monitoring bores during 2017. Recovery bore hydrographs show greatly variable water levels, which are likely a result of measurements taken at different rates of pumping.

SAPROLITE ENVIRONMENTAL 11 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 4.2 Jundee TSF Bores – Potentiometric Levels Change to 2017 Ground Initial Dec-16 Dec-17 WL (m) +Rise / - Level Fall Bore RL Water Water Water Water Water Water (mAHD) Since Since Date Depth Level Depth Level Depth Level Initial 2016 (mbgl) (mAHD) (mbgl) (mAHD) (mbgl) (mAHD) JRB01 546.44 Jul 1998 6.52 539.92 11.38 535.06 5.64 540.80 0.88 5.74 JRB02 546.28 Jul 1998 10.17 536.11 8.81 537.47 36.10 510.18 -25.93 -27.29 JRB03 546.17 Jul 1998 4.57 541.60 6.60 539.57 2.05 544.12 2.52 4.55 JRB04 547.55 Jul 1998 5.64 541.90 31.75 515.80 37.12 510.44 -31.46 -5.36 JRB05 546.03 Jul 1998 4.64 541.38 19.35 526.68 15.31 530.73 -10.65 4.05 JRB06 543.38 Jul 1998 1.57 541.81 3.48 539.90 26.37 517.01 -24.80 -22.89 JRB07 543.62 Jul 1998 1.86 541.76 3.80 539.82 36.22 507.40 -34.36 -32.42 JRB08 544.54 Jul 1998 4.96 539.58 9.98 534.56 36.41 508.13 -31.45 -26.43 JRB09 545.16 Mar 2008 3.44 541.72 10.27 534.89 34.31 510.85 -30.87 -24.04 JRB10 554.53 Mar 2008 10.12 544.41 30.88 523.65 32.22 522.31 -22.10 -1.34 JRB11 544.34 Mar 2013 2.49 541.85 6.82 537.52 5.87 538.47 -3.38 0.95 JRB12 544.13 Mar 2013 2.58 541.55 5.87 538.26 45.36 498.77 -42.78 -39.49 JRB13 544.39 Mar 2013 1.43 542.96 3.66 540.73 15.79 528.60 -14.36 -12.13 JRB14 547.75 Mar 2013 3.83 543.92 33.90 513.85 28.90 518.85 -25.07 5.00 JRB15 545.48 Mar 2013 6.65 538.83 Dry Dry 32.30 513.18 -25.65 N/A JMB17 545.98 Jul 1998 4.13 541.85 3.66 542.32 2.29 543.69 1.84 1.37 JMB01-D 546.91 Jul 1998 5.22 541.69 1.07 545.84 0.11 546.80 5.11 0.96 JMB04-D 546.38 Jul 1998 6.10 540.28 6.44 539.94 5.35 541.04 0.76 1.10 JMB07-D 544.32 Jul 1999 4.73 539.59 5.23 539.09 3.68 540.64 1.05 1.55 JMB08-D 543.92 Jul 1999 3.49 540.43 1.46 542.46 0.42 543.50 3.07 1.04 JMB09-D 543.83 Jul 1999 2.03 541.80 1.26 542.57 0.97 542.86 1.06 0.29 JMB10-D 543.88 Jul 1999 2.26 541.62 1.97 541.91 1.60 542.28 0.66 0.37 JMB10-S 543.88 Jul 1999 2.25 541.63 1.74 542.14 1.23 542.65 1.02 0.51 JMB14-D 542.35 Oct 2004 2.60 539.75 3.27 539.08 2.63 539.72 -0.03 0.64 JMB15-D 555.15 Dec 2008 14.08 541.07 18.86 536.29 17.01 538.14 -2.93 1.85 JMB16-D 548.41 Mar 2010 6.33 542.08 8.10 540.31 7.93 540.48 -1.60 0.17 JMB05-D 554.08 Jul 1998 7.92 546.16 8.70 545.38 10.14 543.94 -2.22 -1.44 JMB05-S 554.08 Jul 1998 5.55 548.53 7.70 546.38 Dry Dry N/A N/A JMB06-D 557.67 Jul 1998 13.56 544.11 13.34 544.33 13.15 544.52 0.41 0.19 JMB06-S 557.67 Jul 1998 5.58 552.09 Dry Dry Dry Dry N/A N/A JMB23A 547.44 Aug 1998 7.53 539.91 6.77 540.67 5.81 541.63 1.72 0.96 JMB24 547.48 Aug 1998 7.99 539.49 6.77 540.71 5.91 541.57 2.08 0.86 JMB11-D 545.02 Sep 2004 1.26 543.76 2.89 542.13 1.59 543.43 -0.33 1.30 JMB11-S 545.01 Sep 2004 1.33 543.68 2.94 542.07 Dry Dry N/A N/A JMB19 543.21 Oct 1998 2.52 540.69 4.95 538.26 4.54 538.67 -2.02 0.41 JMB20 543.78 Oct 1998 3.38 540.40 4.94 538.84 4.13 539.65 -0.75 0.81 JMB12-D 542.97 Sep 2004 2.48 540.49 3.17 539.80 2.55 540.42 -0.07 0.62 JMB12-S 542.95 Sep 2004 2.43 540.52 3.21 539.74 2.53 540.42 -0.10 0.68 JMB13-D 545.49 Sep 2004 2.92 542.57 3.41 542.08 2.13 543.36 0.79 1.28 JMB13-S 545.78 Sep 2004 3.18 542.60 3.28 542.50 2.12 543.66 1.06 1.16 JMB25 546.83 Aug 1998 6.08 540.75 3.57 543.26 4.84 541.99 1.24 -1.27 JMB26 542.48 Aug 1998 3.91 538.57 4.45 538.03 3.86 538.62 0.05 0.59 JMB27 543.58 Aug 1998 4.44 539.14 4.93 538.65 4.28 539.30 0.16 0.65 JMB28 545.77 Aug 1998 5.48 540.29 1.95 543.82 0.97 544.80 4.51 0.98 JMB29 544.85 Aug 1998 5.34 539.51 10.32 534.53 8.96 535.89 -3.62 1.36 N/A Not Available

SAPROLITE ENVIRONMENTAL 12 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 4.3 Nimary Tailings Storage Facility Monitoring Bores

Water levels were measured at annually from seven monitoring bores around the Nimary TSFs in compliance with the licence to operate, Table 2.2. Two monitoring bore (NMB07-D and NMB10-S) were dry during the review period.

Water levels in metres above the Australian Height Datum (mAHD) are plotted on time-series hydrographs, Appendix E, and historical water measurements in metres below top of casing (mbtoc) and mAHD are presented in Appendix F. Interpreted potentiometric contours of water levels in metres below ground level (mbgl) and mAHD are presented as Figures 12 and 13 respectively. Table 4.3 shows comparative water level measurements after initial construction, in 2016 and in 2017.

NMB08 has historically had incremental rising water levels a trend that has continued during the review period with water levels showing a very slight rise as indicated by the annual change values in Tables 4.3. All other Nimary bores have a long term trend of declining water levels as shown on hydrographs, Appendix E.

Table 4.3 Nimary TSF Bores - Potentiometric Levels Change to 2017 Initial (Jul 1996) 2016 December 2017 WL (m) +Rise / - Ground Fall Bore Level RL Water Water Water Water Water Water (mAHD) Since Since Depth Level Date Depth Level Depth Level Initial 2016 (mbgl) (mAHD) (mbgl) (mAHD) (mbgl) (mAHD)

NMB01-D 561.57 14.5 547.07 Nov-16 14.21 547.37 14.53 547.05 -0.03 -0.33 NMB02-D 562.7 17.27 545.43 Nov-16 19.45 543.25 20.39 542.31 -3.12 -0.94 NMB03-D 565.74 21.28 544.46 Nov-16 25.09 540.65 26.98 538.76 -5.70 -1.89 NMB04 578.84 11.35 567.49 Dec-16 51.79 527.05 54.72 524.12 -43.37 -2.93 NMB07-D 571.76 29.35 542.41 Sep-16 Dry Dry Dry Dry N/A N/A NMB08 563.04 19.5 543.54 Dec-16 17.38 545.66 16.95 546.09 2.55 0.43 NMB09-D 562.02 17.34 544.68 Dec-16 14.45 547.57 14.56 547.46 2.78 -0.11 NMB10-D 558.62 7.21 551.41 Sep-16 12.32 546.30 12.88 545.74 -5.67 -0.56 NMB10-S 558.61 7.02 551.59 Sep-16 12.31 546.30 Dry Dry N/A N/A NA: Not Available.

SAPROLITE ENVIRONMENTAL 13 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

5. ANALYTICAL RESULTS – WATER AND SOIL

The collection of water samples was undertaken in accordance with AS5667.1 and all sampling is conducted according to the Jundee Water Sampling scheduled matrix and procedural documents. Field data sheets were completed by Jundee’s Environment Department at the time of sampling including date and time of sample collection. Field readings for pH and TDS were recorded. Quality control data is stored in NSR’s internal database, and necessary information is transferred to Saprolite for analysis and review.

The water samples collected were submitted to MPL Environmental Laboratories (a NATA certified testing laboratory) for water quality analyses.

5.1 Fisher In-Pit Tailings Storage Facility Water Monitoring

Water quality analyses was carried out on groundwater sampled from five monitoring bores (FMB04, FMB05, FMB09, FMB10 and FMB11) in March, July, September and December 2017, as required by the licence to operate. Laboratory analysis results are presented in Table 5.1 and field measurements are presented in Table 5.2. A plan showing interpreted contours and spot values of groundwater salinity from laboratory results for the Fisher TSF as at December 2017 is presented in Figure 14.

Water quality parameters: salinity (as TDS), field pH and WADCN are presented graphically on time-series hydrographs, Appendix E. Complete water chemistry for the review period is presented in Appendix G.

Table 3.3.1 of the Licence, Table 2.2, does not specify any limits on the results of the monitoring criteria.

During the review period, pH values ranged from 6.44 to 7.76, TDS values ranged from 301 to 14,240mg/L and WADCN was up to 0.008mg/L with some concentrations unable to be measured as they were below the Practical Quantification Limit (PQL).

Laboratory analyses had variable PQL’s during the review period particularly in September. This had led to some analytes being detected where previously they would have been below detectable limits. However none of the analytes exceeded the Livestock Watering Criteria, ANZECC 2000.

SAPROLITE ENVIRONMENTAL 14 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 5.1 Fisher In-Pit TSF – Laboratory Analysis (mg/L) BORE DATE As Cd Cu Hg Ni Pb Zn WADCN 17-Mar-17 <0.05 <0.01 <0.01 0.00029 <0.02 <0.03 <0.02 0.007 15-Jul-17 <0.05 <0.01 0.01 <0.00005 0.13 <0.03 0.04 0.005 FMB04 23-Sep-17 <0.001 0.0003 0.001 <0.00005 0.007 <0.001 0.005 <0.004 17-Dec-17 <0.05 <0.01 <0.01 0.00032 <0.02 <0.03 0.02 <0.004 17-Mar-17 N/A N/A N/A N/A N/A N/A N/A N/A 15-Jul-17 <0.05 <0.01 <0.01 0.0002 <0.02 <0.03 <0.02 0.008 FMB05 23-Sep-17 <0.001 0.0002 <0.001 0.00013 <0.001 <0.001 0.005 <0.004 17-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Apr-17 <0.05 <0.0001 <0.01 <0.00005 <0.02 <0.03 0.05 <0.004 15-Jul-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 FMB09 23-Sep-17 <0.001 <0.0001 <0.001 <0.00005 0.002 <0.001 0.003 <0.004 17-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Apr-17 <0.05 <0.0001 <0.01 <0.00005 <0.02 <0.03 <0.02 0.006 15-Jul-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 0.007 FMB10 23-Sep-17 <0.001 <0.0001 <0.001 <0.00005 <0.001 <0.001 0.003 <0.004 17-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 17-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 15-Jul-17 <0.05 <0.01 <0.01 0.0001 <0.02 <0.03 <0.02 0.005 FMB11 23-Sep-17 0.001 <0.0001 <0.001 <0.00005 0.002 <0.001 0.005 <0.004 17-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 N/A Not Available

Table 5.2 Fisher In-Pit TSF – Field Measurements Field pH Field TDS BORE DATE (pH units) (mg/L) 17-Mar-17 6.93 14,240 15-Jul-17 6.44 5,920 FMB04 23-Sep-17 7.08 9,340 17-Dec-17 6.98 14,020 17-Mar-17 N/A N/A 15-Jul-17 6.64 9,210 FMB05 23-Sep-17 6.98 5,760 17-Dec-17 6.97 5,490 3-Apr-17 7.23 5,620 15-Jul-17 7.76 301 FMB09 23-Sep-17 7.17 12,540 17-Dec-17 7.47 7,460 3-Apr-17 7.11 3,160 15-Jul-17 6.44 2,270 FMB10 23-Sep-17 6.95 2,210 17-Dec-17 7.55 3,170 17-Mar-17 7.30 1,137 15-Jul-17 7.13 3,420 FMB11 23-Sep-17 6.64 3,800 17-Dec-17 7.12 1,630 N/A Not Available

SAPROLITE ENVIRONMENTAL 15 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 5.2 Jundee Tailings Storage Facility Water Monitoring

Water quality analyses were carried out on groundwater sampled from Jundee Compliance Bores quarterly, as required by the licence to operate. A summary of the water quality laboratory analyses for the Compliance Bores carried out during the review period is presented in Table 5.3 and field measurements are presented in Table 5.4. A plan showing interpreted contours and spot values of groundwater salinity from laboratory results for the Jundee TSFs as at December 2017 is presented in Figure 15.

Water quality parameters: salinity (as TDS), field pH and WADCN are presented graphically on time-series hydrographs, Appendix E. Complete water chemistry for the review period is presented in Appendix G.

Table 3.4.1 in the licence, Table 2.2, specifies 16 monitoring bores near the Jundee TSFs to be compliance bores with laboratory and field chemistry sampling requirements. None of the compliance bores exceeded the limits presented in Table 3.4.1.

During the review period, pH values ranged from 6.58 to 7.66, TDS values ranged from 263 to 5,160mg/L and WADCN was below the PQL for all analyses. All measurements for cadmium, mercury and lead recorded concentrations below PQL for all bores during all four quarterly monitoring events. Some measurements for other analytes returned values above the PQL in September however, this was due to the lower PQL during this quarter. None of the values detected were above the PQL in the other three quarters.

SAPROLITE ENVIRONMENTAL 16 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 5.3 Jundee Compliance Bores – Laboratory Analysis (mg/L) BORE DATE As Cd Cu Hg Ni Pb Zn WADCN LTO Criteria <0.5 5-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB5-D 24-Sep-17 N/A N/A N/A N/A N/A N/A N/A N/A 15-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 5-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB6-D 24-Sep-17 <0.001 <0.0001 0.002 <0.00005 0.002 <0.001 0.002 <0.004 15-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 2-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 8-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB11-D 16-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 2-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 8-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB12-D 16-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB13-D 30-Sep-17 0.001 <0.0001 <0.001 <0.00005 <0.001 <0.001 0.002 <0.004 15-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 8-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB19 14-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 2-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 8-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB20 14-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB21 16-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 8-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB22 14-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 15-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 5-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB23A 24-Sep-17 N/A N/A N/A N/A N/A N/A N/A N/A 15-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 5-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB24 24-Sep-17 0.004 <0.0001 0.002 <0.00005 0.002 <0.001 <0.001 <0.004 15-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 5-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB25 24-Sep-17 0.004 <0.0001 0.001 <0.00005 0.002 <0.001 <0.001 <0.004 15-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Mar-17 N/A N/A N/A N/A N/A N/A N/A N/A 8-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB26 14-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 N/A Not Available

SAPROLITE ENVIRONMENTAL 17 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 5.3 Jundee Compliance Bores – Laboratory Analysis (mg/L) continued BORE DATE As Cd Cu Hg Ni Pb Zn WADCN LTO Criteria <0.5 3-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 8-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB27 14-Sep-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 3-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB28 24-Sep-17 0.002 <0.0001 <0.001 <0.00005 <0.001 <0.001 <0.001 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 5-Mar-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 9-Jun-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 JMB29 24-Sep-17 <0.001 <0.0001 <0.001 <0.00005 0.001 <0.001 0.006 <0.004 14-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004

Table 5.4 Jundee Compliance Bores – Field Measurements Field pH Field TDS BORE DATE (pH units) (mg/L) LTO Criteria 6.0 – 9.0 <14,000 5-Mar-17 7.25 671 9-Jun-17 7.23 263 JMB5-D 30-Sep-17 N/A N/A 15-Dec-17 7.31 1,430 5-Mar-17 7.39 1,730 9-Jun-17 7.43 1,640 JMB6-D 24-Sep-17 7.57 908 15-Dec-17 7.37 1,640 2-Mar-17 6.92 2,640 8-Jun-17 6.78 2,870 JMB11-D 16-Sep-17 7.02 2,870 14-Dec-17 7.08 2,240 2-Mar-17 7.03 4,160 8-Jun-17 6.92 4,540 JMB12-D 16-Sep-17 7.15 4,440 14-Dec-17 7.00 4,210 3-Mar-17 7.36 1,710 9-Jun-17 7.33 1,690 JMB13-D 30-Sep-17 7.49 1,640 15-Dec-17 7.66 1,620 3-Mar-17 7.45 1,117 8-Jun-17 7.44 1,123 JMB19 14-Sep-17 7.47 1,084 14-Dec-17 7.55 663 2-Mar-17 7.15 1,780 8-Jun-17 7.02 1,780 JMB20 14-Sep-17 7.15 1,820 14-Dec-17 7.25 1,056 N/A Not Available

SAPROLITE ENVIRONMENTAL 18 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 5.4 Jundee Compliance Bores – Field Measurements continued Field pH Field TDS BORE DATE (pH units) (mg/L) LTO Criteria 6.0 – 9.0 <14,000 3-Mar-17 7.36 1,650 9-Jun-17 7.47 1,720 JMB21 16-Sep-17 7.32 1,730 14-Dec-17 7.45 1,510 3-Mar-17 6.98 5,160 8-Jun-17 6.79 5,070 JMB22 14-Sep-17 7.02 4,830 15-Dec-17 7.17 4,950 5-Mar-17 7.28 1,024 9-Jun-17 7.23 1,390 JMB23A 30-Sep-17 N/A N/A 15-Dec-17 N/A N/A 5-Mar-17 7.04 778 9-Jun-17 6.99 735 JMB24 24-Sep-17 7.66 306 15-Dec-17 7.20 1,008 5-Mar-17 7.28 1,107 9-Jun-17 7.23 1,650 JMB25 24-Sep-17 7.19 424 15-Dec-17 7.12 765 3-Mar-17 N/A N/A 8-Jun-17 7.09 1,093 JMB26 14-Sep-17 7.30 1,096 14-Dec-17 7.38 1,067 3-Mar-17 7.18 2,200 8-Jun-17 6.83 3,380 JMB27 14-Sep-17 7.20 2,330 14-Dec-17 7.25 2,250 3-Mar-17 7.35 1,281 9-Jun-17 7.13 4,950 JMB28 24-Sep-17 7.50 1,400 14-Dec-17 7.60 1,700 3-Mar-17 6.73 1,490 9-Jun-17 6.58 1,460 JMB29 16-Sep-17 7.34 1,185 14-Dec-17 6.75 3,230 N/A Not Available

SAPROLITE ENVIRONMENTAL 19 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 5.3 Nimary Tailings Storage Facility Water Monitoring

A summary of the water quality laboratory analyses for the Nimary bores carried out during the review period is presented in Table 5.5. A plan showing spot values of groundwater salinity from laboratory results for the Nimary TSF as at December 2017 is presented in Figure 16.

Water quality parameters: salinity (as TDS), field pH and WADCN are presented graphically on time-series hydrographs, Appendix F. Complete water chemistry for the review period is presented in Appendix G.

Table 3.4.1 in the licence, Table 2.2, specifies six monitoring bores near the Nimary TSF to be compliance bores (NMB04-D, NMB07-D, NMB08, NMB09-D, NMB10-S and NMB10- D) with annual laboratory and field chemistry sampling requirements. None of the Nimary Compliance Bores exceeded the limits outlined in the licence to operate. Laboratory analysis results and field measurements are presented in Tables 5.5 and 5.6 respectively.

During the review period pH values ranged from 6.97 to 7.5, TDS values ranged from 510 to 3,480mg/L and WADCN was up to 0.005mg/L with most analyses below the PQL. All concentrations for arsenic, nickel, zinc, copper, lead, cadmium and mercury were below PQL for all bores.

Table 5.5 Nimary TSF Compliance Bores – Laboratory Analysis (mg/L) BORE DATE As Cd Cu Hg Ni Pb Zn WADCN DER Criteria 0.5 NMB04-D 16-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 0.005 NMB07-D 16-Dec-17 Dry Dry Dry Dry Dry Dry Dry Dry NMB08-D 16-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 NMB09-D 16-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 NMB10-D 16-Dec-17 <0.05 <0.01 <0.01 <0.00005 <0.02 <0.03 <0.02 <0.004 NMB10-S 16-Dec-17 Dry Dry Dry Dry Dry Dry Dry Dry N/A: Not Available

Table 5.6 Nimary TSF Compliance Bores – Field Measurements Field pH Field TDS BORE DATE (pH units) (mg/L) DER Criteria 6.0 – 9.0 <14,000 NMB04-D 16-Dec-17 7.01 3,480 NMB07-D 16-Dec-17 Dry Dry NMB08-D 16-Dec-17 6.97 2,620 NMB09-D 16-Dec-17 7.48 510 NMB10-D 16-Dec-17 7.50 546 NMB10-S 16-Dec-17 Dry Dry N/A: Not Available

SAPROLITE ENVIRONMENTAL 20 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 5.4 Mine Dewatering Monitoring

Water quality analyses were undertaken on groundwater sampled from the Barton Level 4 Clean Dam (Barton Dam) and Main Pit Receiving Water Body (Main-Pit) as a requirement under Condition 3.3.1. A summary of the laboratory results including the analysis for ions, metals and hydrocarbons are presented on Tables 5.7.

Barton Level 4 Clean Dam

Water pumped from the Barton Underground to Barton Dam during the review period had a pH ranging from 6.61 to 7.6. Salinity as TDS decreased from March (20,000mg/L) to July (14,690mg/L) then increased to the December quarter (18,000mg/L).

All analytes remained relatively stable and show no significant variation from previous years. Analyte concentrations were above ANZECC Livestock Watering Criteria (2000) for calcium, fluoride, sulphate, silica and TDS at various points during the review period. However, water quality from Barton L4CD is not considered a concern as it is not utilised as livestock drinking water or disposed of near other water sources of better quality, Figure 7b.

Main Pit Receiving Water Body

During the review period water at Main Pit had a relatively stable pH (ranging from 7.3 in June to 7.6 in March and December) and salinity (ranging from 12,000mg/L TDS in September to 18,000mg/L TDS in March).

Analyte concentrations were above ANZECC Livestock Watering Criteria (2000) for calcium (in March and December), sulphate (all quarters), TDS (all quarters) and silica (all quarters). Unusually high concentrations of aluminium, arsenic, cadmium, iron, nickel, lead and zinc were recorded in September with arsenic, cadmium, nickel and lead exceeding ANZECC Criteria. Theses analytes returned to lower levels during the December monitoring event. TRH results in September and December were also unusually high across all fractions. Water quality from Main Pit is not considered an immediate concern as it is not utilised as livestock drinking water or disposed of near other water sources of better quality.

SAPROLITE ENVIRONMENTAL 21 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 5.7 Mine Dewatering Water Quality Laboratory Analysis* Site Barton Level 4 Clean Dam Main Pit Receiving Water Body Quarter Mar-17 Jul-17 Sep-17 Dec-17 Mar-17 Jun-17 Sep-17 Dec-17 pH (Lab) 7.4 6.61 7.6 7.2 7.6 7.3 7.5 7.6 TDS (Lab) 20,000 14,690 17,000 18,000 18,000 14,000 12,000 16,000 # (C6-C9) <10 <10 <10 <10 <10 <10 22 22 # (C10-C14) 63 230 220 120 <50 <50 2,900 3,000 # TRH (C15-C28) 1,200 450 1,400 340 100 <100 5,400 4,700 # (C29-C36) 510 200 600 160 <100 <100 3,200 2,700 Total P 0.13 0.81 0.12 <0.05 <0.05 <0.05 <0.05 0.11 Total N 39 38 48 42 40 42 18 9.9 Na 4,600 4,100 4,000 3,600 4,500 3,100 2,600 3,700 K 57 45 53 52 64 37 62 52 Ca 1,800 1,500 1,300 1,400 1,600 1,000 780 1,200 Mg 390 330 400 360 410 350 290 330 Cl 8,900 7,000 7,600 7,500 8,400 6,100 5,200 6,500

CO3 <5 <5 <5 <5 <5 <5 <5 <5

HCO3 <5 <5 <5 <5 140 84 190 230

SO4 2,500 2,400 2,400 2,300 2,500 1,500 2,000 2,300

NO3 100 110 140 75 110 140 37 <10 F N/A <2 2.2 <2 N/A 1 1.1 <2

SiO2 17 19 17 16 17 15 20 20 Al <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 2.3 <0.1 As 0.11 0.09 0.09 0.09 0.095 0.092 2.3 0.07 B 3.5 3.6 3.6 3.3 3.8 1.8 4.7 3.4 Cd <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 1.8 <0.01 Fe 0.32 0.09 0.19 0.29 0.27 <0.02 2 0.15 Hg <0.00005 <0.00005 <0.00005 <0.00005 <0.00005 <0.00005 <0.00005 <0.00005 Ni <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 1.9 <0.02 Pb <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 1.8 <0.03 Zn 0.04 <0.02 0.03 <0.02 <0.02 0.03 1.9 <0.02 *All units in mg/L, except pH (no units) and TRH μg/L N/A: Not Available # Reanalysed 29 January 2018

SAPROLITE ENVIRONMENTAL 22 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 5.5 Jundee Bioremediation Landfarm Water Monitoring

Water quality analyses were undertaken from the three shallow piezometers located around the perimeter of the landfarm near the Jundee TSF. Water samples were collected and analysed in December 2017 as required by Condition 3.3.1 of the licence. Results are presented in Table 5.8.

The analyses were below the PQL for TRH fractions in all bores during the review.

Table 5.8 Bioremediation Bores Water Quality Laboratory Analysis (μg/L) TRH Site Date C16

5.6 Jundee Bioremediation Landfarm Soil Sampling

Soil sampling and analysis is carried out from the Bioremediation Landfarm (North and South). Soil Samples were collected in June/December 2017 at the Bioremediation Facility. Analysis results are presented in Table 5.9. TSF1 was recommissioned during the review period which prevented soil sampling from TSF North and TSF South.

TRH fractions were below the PQL in June at both Bioremediation Landfarm sites. December samples returned values for fractions C10-C24, C15-C28 and C29-C36.

Table 5.9 Bioremediation Soil Analysis - 2017 (mg/kg) TRH Site Date C6-C9 C10-C14 C15-C28 C29-C36 09-Jun-17 <25 <50 <100 <100 BIOREM Soil North 10-Dec-17 <25 71 2,000 2,100 09-Jun-17 <25 <50 <100 <100 BIOREM Soil South 10-Dec-17 <25 140 4,800 510 N/A N/A N/A N/A N/A TSF North Soil N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A TSF South Soil N/A N/A N/A N/A N/A N/A: Not Available

SAPROLITE ENVIRONMENTAL 23 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

6. GAS GENERATOR EMISSIONS

Analysis of gas generator emissions was undertaken by Complete Envirotest Pty Ltd on 23 November 2017. Results are presented in Table 6.1 below and the complete report is included in Appendix H.

Table 6.1 Gas Generator Emissions Testing

Engine Number CO (ppm) NO (ppm) NO2 (ppm) NOX (ppm) 1 309 140 2 142 2 295 72 2 74 3 399 139 1 140 4 405 105 0 105 5 388 108 0 108 6 332 86 0 86

SAPROLITE ENVIRONMENTAL 24 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

7. LICENCE COMPLIANCE

Conditions 5.2.1 and 5.5.2 set out the information required in this Annual Environmental Report. Condition 5.2.1 specifies that: …The report shall contain the information listed in Table 5.2.1 in the format or form specified in that table. Table 5.2.1 has been reproduced as Table 6.1 below.

Table 7.1 Annual Environmental Report Inclusions (Table 5.2.1: Annual Environmental Report) Condition or table Parameter Format or form1 (if relevant) - Summary of any failure or malfunction of None specified any pollution control equipment and any environmental incidents that have occurred during the annual period and any action taken Table 3.2.1 Stack testing results of emissions from new None specified gas generators Table 3.3.1 Volumes of tailings deposited, supernatant None specified liquor returned to process plant and seepage water recovered. Volume of mine dewater discharge and surface water parameters Tables 3.4.1 – 3.4.2 Groundwater quality parameters None specified Soil quality sampling 5.1.3 Compliance Annual Audit Compliance Report (AACR) 5.1.4 Complaints summary None specified Note 1: Forms are in Schedule 2

7.1 Incident and Exceedance Reporting

No exceedances of groundwater quality parameter limits occurred during the 2017 review period.

NSR sought advice from DWER regarding a controlled spill not causing pollution in the processing plant. The incident was reported to the DWER during the review period. A summary of the incident and the remedial action taken are outlined in Table 6.2 below.

Table 7.2 Site Incidents 2017 Date Incident Site Response A spill of process water from the Jundee ball Incident was reported via email to the DER on mill sump at the processing plant occurred 2 February 2017. after a powerhouse outage. The spill was Spill area was cleaned up. As the spill was 01-Feb-2017 contained within the secondary containment contained on the hardstand within bund. containment DER advised no further action would be taken and the incident did not breach its licence conditions.

SAPROLITE ENVIRONMENTAL 25 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations 7.2 Monitoring Requirement

Under L6498/1995/11, conditions 3.2 (monitoring of point source emissions to air), 3.3 (monitoring of inputs and outputs) and 3.4 (ambient environmental quality monitoring) specifies the types, locations and limits of monitoring measurements required. Condition 3.2 relates to recently commissioned gas gensets. A summary of compliance compared to conditions 3.3 and 3.4 is presented below. A record of field equipment calibration procedures are presented in Appendix I.

Tables 6.3 summarises compliance with Condition 3.4.1, Table 3.4.1, Note 3 which specifies A minimum of 90% of all bores listed in Table 3.3.1 will be sampled during any quarterly period to allow for maintenance and operational constraints. The reference to Table 3.3.1 in the footnote of Table 3.4.1 is suspected to be a typographical error and should reference Table 3.4.1. Three quarters recorded more than 90% of required information with 89% recorded in March. The majority of unrecorded parameters were due to dry, blocked or silted bores that could not be sampled. Table 6.3 summarises non-operational omissions to monitoring that occurred during the review period.

Table 7.3 Monitoring Compliance Summary Q1 Q2 Q3 Q4 of

Categories o N of Locations of Locations

Frequency o Recorded Recorded Recorded Recorded Prescribed Prescribed Prescribed Prescribed Measurements N Jundee Recovery 14 1 Monthly 35 42 36 42 36 42 36 42 WLs Jundee Seepage 11 1 Quarterly 10 11 10 11 11 11 11 11 WLs Jundee Compliance 19 1 Quarterly 17 19 18 19 18 19 16 19 WLs Fisher Inpit TSF 6 1 Quarterly 6 6 6 6 6 6 6 6 Monitoring WL Fisher Inpit TSF Seepage 3 1 Quarterly 2 3 2 3 2 3 3 3 Recovery WL Nimary Seepage 3 1 Annually 0 0 0 0 0 0 3 3 Indication WLs Nimary Compliance 6 1 Annually 0 0 0 0 0 0 4 6 WLs Jundee Compliance 16 10 Quarterly 150 160 160 160 140 160 158 160 Chemistry Fisher In Pit TSF Monitoring 5 10 Quarterly 40 50 50 50 50 50 50 50 Chemistry Nimary Compliance 6 10 Annually 0 0 0 0 0 0 40 60 Chemistry Bioremediation 3 1 Annually 0 0 0 0 0 0 2 3 Total 260 291 282 291 263 291 329 363 % Recorded 89% 97% 90% 91%

SAPROLITE ENVIRONMENTAL 26 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations Table 7.4 Monitoring Omissions Monitoring Parameter Requirement Event Reason Point Barton Level Quarterly Fluoride Missing March Error in CoC 4 Clean Dam laboratory analysis Main Pit Quarterly Receiving Fluoride Missing March Error in CoC laboratory analysis Water Body

7.3 Improvements

Table 4.1.1 in Licence L6498/1995/11 Condition 4.1.1 lists four improvements (IR1 to IR4) required by the Jundee site. x IR1 refers to the commissioning of the gas generators in the new powerhouse at Jundee that occurred in November 2017. A commissioning report is yet to be submitted to DWER. x IR2 and IR3 refer to a water quality monitoring program to test the concentration of selenium. The program occurred throughout all sampling periods in 2016. x IR4 refers to the requirement of a report detailing the results of the monitoring programs as listed in IR2 and IR3. The report, “Submission of IR4 Report detailing results of selenium monitoring programs”, was submitted to the DER on 30 November 2016.

7.4 Complaints

No complaints have been received by Jundee during the 2017 review period.

SAPROLITE ENVIRONMENTAL 27 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

8. RECOMMENDATIONS

8.1 Licence Requirements and definitions It is recommended the licence be altered in the following ways: x Replace the text “Table 3.3.1” with “Table 3.4.1” in Condition 3.4.1, Table 3.4.1, Note 3. 8.2 Fisher In-Pit Tailings Storage Facility x Continue routine groundwater monitoring for all monitoring points as per the recommended schedule, Table 2.3. x Continue with existing seepage management practices, including: o minimising the size and extent of the supernatant pond through decantation of tailings liquor back to the Plant; o continued pumping from recovery bores; and o optimisation of the pumping arrangement of surface water within the Pit.

8.3 Jundee Tailings Storage Facility x Continue routine groundwater monitoring for all monitoring points as per the recommended schedule, Table 2.3. x Continue with existing seepage management practices, including: o Maintain continuous operation of the recovery bores. o Maximising returns from seepage interception trenches into the tailings return pond.

8.4 Nimary Tailings Storage Facility x Continue routine groundwater monitoring for all monitoring points as per the recommended schedule, Table 2.3. x Remove NMB07-D from Table 3.4.1 as it has been dry for over 2 years.

8.5 Barton Mine Dewatering x Continue routine groundwater monitoring for all monitoring points at the required frequency as per the recommended schedules, including the monitoring of the Main-Pit receiving water body, Table 2.3.

8.6 Jundee Bioremediation Landfarm Soil Sampling x Remove TSF1 from soil sampling requirements as it is now an active TSF.

SAPROLITE ENVIRONMENTAL 28 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations

9. REFERENCES

AQUATERRA, 2009, Seepage Management – Jundee TSF2, unpublished memorandum to Newmont Jundee Operations, June, 2009. AUSTRALIA AND NEW ZEALAND ENVIRONMENT AND CONSERVATION COUNCIL & AGRICULTURE AND RESOURCE MANAGEMENT COUNCIL OF AUSTRALIA AND NEWZEALAND, 2000, National Water Quality Management Strategy, Australian and New Zealand Guidelines for Fresh and Marine Water Quality, October 2000. COFFEY MINING, 2013, Geotechnical Assessment Report – Tailing Storage Facility 2, draft unpublished report for Newmont Yandal Operations – Jundee Gold Operations, February 2013, report MINEWPER00006AT-AA rev B. NEWMONT JUNDEE OPERATIONS, 2013, Groundwater Recovery Seepage Management Plan, unpublished report for the DER in relation to works approval for 2012 TSF2 tailings dam lift, August 2013. RICH CONSULTING SERVICES, 2005a, Annual Environmental Report to the Department of Environment – Licence No 6498/8, 1 July 2003 to 31 December 2004, Jundee Tailings Storage Facility and Fisher In-Pit Tailings Storage Facility; unpublished report for Newmont Yandal Operations Ltd, Mar 05, RCS Report No N0103-01-D. RICH CONSULTING SERVICES, 2005b, Water Monitoring Management Jundee-Nimary Water Monitoring Audit, June 2005, Newmont Jundee Operations; unpublished report for Newmont Yandal Operations Ltd, November 2005, RCS Report No N0107-01-Ver-A. RICH CONSULTING SERVICES, 2006, Fisher In-Pit Tailings Storage Facility Monitor Bore Drilling Report, January 2006, Newmont Jundee Operations; unpublished report for Newmont Yandal Operations Ltd, March 2006, RCS Report No N0108-01-Ver-B. RICH CONSULTING SERVICES, 2006, Sampling, Measurement and Analysis Plans (SMAP) – Guideline NJO- DEWATERING-EMSG001-A, Newmont Jundee Operations – GWL 107143 Mine Dewatering Monitoring, DRAFT report for Newmont Yandal Operations Ltd, July 2006, RCS Report No. N0101-1 RICH CONSULTING SERVICES, 2006, Sampling, Measurement and Analysis Plans (SMAPS) – Overview Document, Newmont Jundee Operations – Complete Site Monitoring Requirements Groundwater and Surface Water, DRAFT report for Newmont Yandal Operations Ltd, August 2006, RCS Report No. N0101-5 RICH CONSULTING SERVICES, 2007, Annual Environmental Report to the Department of Environment and Conservation – Licence No 6498/9, 1 January 2006 to 31 December 2006, Fisher In-Pit Tailings Storage Facility and Jundee Tailings Storage Facility; unpublished report for Newmont Yandal Operations Ltd, April 2007, RCS Report No. N0103-05-ver-A. RICH CONSULTING SERVICES, 2008, Tailings Storage Facility Seepage Recovery System – Recovery Bore and Monitor Bore Drilling Completion Report, Newmont Yandal Operations, Jundee Tailings Storage Facility, Fisher In-Pit Tailings Storage Facility and Plant Site CN Monitoring, unpublished report for Newmont Yandal Operations Ltd, January 2008, RCS Report No. N0107-06-Ver-A. RICH CONSULTING SERVICES, 2008, Annual Environmental Report to the Department of Environment and Conservation – Licence No 6498/9, 1 January 2007 to 31 December 2007, Fisher In-Pit Tailings Storage Facility and Jundee Tailings Storage Facility; unpublished report for Newmont Yandal Operations Ltd, April 2007, RCS Report No. N0103-07-ver-B. RICH CONSULTING SERVICES, 2009, Annual Environmental Report to the Department of Environment and Conservation – Licence No 6498/9, 1 January 2008 to 31 December 2008, Fisher In-Pit Tailings Storage Facility and Jundee Tailings Storage Facility; unpublished report for Newmont Yandal Operations Pty Ltd, March 2009, RCS Report No. N0103-09-ver-C. RICH CONSULTING SERVICES, 2009, Annual Environmental Report to the Department of Environment and Conservation – Licence No 6458/9, 1 January 2008 to 31 December 2008,Nimary Tailings Storage Facility; unpublished report for Newmont Yandal Operations Pty Ltd, March 2009, RCS Report No. N0103-10-ver-C. ROBERTSON GEOCONSULTANTS INC, 2007, V2 Draft – Initial Design of Seepage Recovery System for Jundee TSF 1 & 2 (TSF Expansion). Unpublished report for Newmont Yandal Operations, June 2007. SAPROLITE ENVIRONMENTAL, 2010, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2009, unpublished report for Newmont Yandal Operations Pty Ltd, Mar 2010. SAPROLITE ENVIRONMENTAL, 2011, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2010, unpublished report for Newmont Yandal Operations Pty Ltd, Mar 2011. SAPROLITE ENVIRONMENTAL, 2012a, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2011, unpublished report for Newmont Yandal Operations Pty Ltd, Mar 2012.

SAPROLITE ENVIRONMENTAL 29 27 March 2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Northern Star Resources - Jundee Operations SAPROLITE ENVIRONMENTAL, 2012b, Jundee Tailings Storage Facilities, Seepage Estimations 2011, unpublished memo to Newmont Yandal Operations Pty Ltd, March 2012. SAPROLITE ENVIRONMENTAL, 2012c, Groundwater Recovery Seepage Management Plan (GRSMP), ver C 2012, unpublished report for the DER works approval, written for Newmont Yandal Operations Pty Ltd, August 2012. SAPROLITE ENVIRONMENTAL, 2013a, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2012, unpublished report for Newmont Yandal Operations Pty Ltd, Mar 2013. SAPROLITE ENVIRONMENTAL, 2013b, Groundwater Recovery and Seepage Management Plan – Phase 2 Hydrogeological Investigations and Assessment, ver B 2013, unpublished report for Newmont Yandal Operations Pty Ltd, June 2013. SAPROLITE ENVIRONMENTAL, 2014, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2013, unpublished report for Newmont Yandal Operations Pty Ltd, Mar 2014. SAPROLITE ENVIRONMENTAL, 2015, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2014, unpublished report for Northern Star Resources Ltd, Mar 2015. SAPROLITE ENVIRONMENTAL, 2016, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2015, unpublished report for Northern Star Resources Ltd, Mar 2016. SAPROLITE ENVIRONMENTAL, 2017, Annual Environmental Review for Jundee Operations Jundee TSF, Nimary TSF and Fisher In-Pit TSF, Jan to Dec 2016, unpublished report for Northern Star Resources Ltd, Mar 2017.

SAPROLITE ENVIRONMENTAL 30 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations

FIGURES

SAPROLITE ENVIRONMENTAL 250000mE 275000mE 300000mE 225000mE Location

N Broome

Newman Western Australia 7125000mN 7125000mN Jundee SCALE 1 : 500 000 yu Kalgoorlie Perth 1049 0 25 Millrose L 3114/960 Kilometres MAP GRID OF AUSTRALIA Grid based on Transverse Mercator Projection

7100000mN 7100000mN

Dingo Well Sandhill Well Borefield Jundee Borefield L 3114/1253

Nimary-Jundee Lake Ward Harry Hill Well Borefield llie 607075000mN Village 7075000mN Potable Borefield

Millbillillie Wiluna L 3114/1260

7050000mN 7050000mN

Lake Violet Lake Violet L 3114/472

Lake Way

Lake Way L 3114/1164

7025000mN 7025000mN 225000mE 250000mE 275000mE Barwidgee 300000mE L 3114/772

Client: NORTHERN STAR Project: Date: March 2015 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:500 000

Author: G.R. / S.C. Checked: G.Richards REGIONAL LOCATION PLAN Figure No. 1 Approved: G.Richards A4 Plan No. N0100-001 255000mE 260000mE 265000mE Legend N Production Bore Seepage Recovery Bore

L53/70 270000mE

7095000mN Cork Bore Dingo Well 7095000mN SCALE 1 : 100 000 Jundee L53/153 L53/102 0 5 L 3114/1253

Kilometres M53/537 MAP GRID OF AUSTRALIA L53/71 Grid based on Transverse Mercator Projection Dingo Well Sandhill Well 560 Borefield Borefield L53/68 L53/72 550 L53/137 M53/538 L53/117 7090000mN L53/100 7090000mN

M53/235 L53/69 540 Lake L53/72

M53/236 Ward Bogada Bore Sandalwood Dam L53/73 L53/153

L53/138

540 530

M53/461 M53/451 7085000mN Harry Hill Well 7085000mN

TSF 2 Gum Well M53/446 Nimary M53/193 M53/552 "Jundee" Camp Jundee Soak Plover Bore TSF 1 L53/138 L53/72 M53/929 L53/099 Jundee Plant L/G L53/153 M53/414 Harry Hill Well Nimary

Plant Borefield 550 7080000mN TSF M53/874 7080000mN M53/191

Camel Bore M53/413 Munday Bore Nimarry Bore

550 M53/192 Jundee Camp Millrose Ronnies Bore M53/412 L53/136 L 3114/960

Village M53/477 560 L53/143 M53/707 Potable Elliot Borefield M53/478 53/113

7075000mN M53/940 M53/708 7075000mN 560 L53/112 M53/226 255000mE 260000mE 265000mE 270000mE

Strife Bore 590 L53/136 M53/199

560

560 580 580 M53/479

Client: NORTHERN STAR Project: Date: March 2015 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:100 000

Author: G.R. / S.C. Checked: G.Richards PROJECT AREA PLAN Figure No. 2 Approved: G.Richards A4 Plan No. N0100-002 260500mE 261000mE Legend Clay Seepage Recovery Bore Stockpile Seepage Recovery Bore Destroyed Monitoring Bore

W6 & W7 Note: Previous Bore Names in grey with smaller text size. 261500mE

7082000mN 7082000mN

W3

Barton

FMB10 (JFP4)

(FMB8) FRB03 (FMB3) FMB08 Collapsed FMB09 (JFP3) W4 (FMB7) FMB07 FRB04 (FMB3A) FMB11 FRB05 (JFP10) 7081500mN FRB02 Collapsed (FMB2) 7081500mN Fisher IPTSF

FRB01 (FMB1) FMB06 Lyons (FMB6) FMB12 (JFE10) (FMB5) FMB04 (JFP10) FMB05

7081000mN 7081000mN

Main

Nim 3 N

7080500mN Hughes 7080500mN

SCALE 1 : 10 000 0 500

Metres MAP GRID OF AUSTRALIA Grid based on Transverse Mercator Projection 261000mE 261500mE 260500mE W1 & W2 7080000mN 7080000mN

Client: NORTHERN STAR Project: Date: March 2015 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:10 000

Author: G.R. / S.C. FISHER IN-PIT TAILINGS STORAGE FACILITY Checked: G.Richards Figure No. 3 BORE LOCATION PLAN Approved: G.Richards A4 Plan No. N0100-010 262500mE 262000mE 263000mE 264000mE 264500mE Legend 263500mE JMB13-S MB13-S N SP18 Monitoring Bore JMB13-D MB13-D JMB26 7085000mN JMB29 SP22 SP19 JMB27 Compliance Bore SP17 JMB25 JMB28 SP21 JRB08 JTP12 Seepage Indication / Recovery Bore JRB14 JMB43 SP16 JMB24 JRB09 JTP15 GRSMP Seepage Indication / Recovery Bore

L53/72 Bioremediation Monitoring Bore Bores destroyed and / or removed JMB07-S MB7-S SCALE 1 : 10 000 JMB07-D MB7-D from monitoring schedule 0 500 JMB21 JTP13 Soil Sampling Site Metres MAP GRID OF AUSTRALIA Bioremediation Area Grid based on Transverse Mercator Projection SP15A JMB23A M53/552 Note: D = Deep Piezometer JRB11 JTP7 JRB05 S = Shallow Piezometer JMB44 7084500mN SP15 JMB23 7084500mN Note: Previous Bore Names in Grey with smaller text size. JMB40 SP26 TSF 2 261000mE 261500mE L53/153 JMB08-S MB8-S MB1-S JMB01-S JMB08-D MB8-D MB1-D JMB01-D JTP6 JRB04

JMB22 JTP14

MB9-S JMB09-S MB14 JMB14 JMB09-D MB9-D 7084000mN JMB46 7084000mN JMB47 JMB12-S MB12-S JRB06 JTP10 JMB12-D MB12-D

JRB12 JMB10-S MB10-S M53/193 JMB10-D MB10-D

JRB07 JTP11

JRB13 JRB03 JTP4 JMB45 JMB03-S MB3-S 7083500mN JMB03-D MB3-D 7083500mN JMB17 JTP1 JMB36 SP9

TSF 1 JMB35 JRB15 SP8 JMB11-S MB11-S JMB11-D MB11-D JRB02 JTP3

MB6-S JMB06-S MB6-D JMB06-D JMB04-S MB4-S JMB04-D MB4-D JMB19 JTP8 JTP9 JMB20 JRB01 JTP2 "Jundee" L53/72 M53/929 7083000mN JMB37 7083000mN SP14 Biorem3 JHMB3 STATION BORE 263500mE 264000mE 264500mE Station Bore JHMB2 Biorem2 M53/552 Old Camp Bore OLD CAMP BORE Bioremediation L53/153 Landfarm Client: JUNDEE OPERATIONS Plover Bore M53/874 JMB05-S JTP16 Project: W6 & W7 JRB10 MB16 JMB16 NORTHERN STAR JMB05-D JHMB1 Biorem1 Author: G.Richards Checked: G.Richards MB5-S JMB05-S RESOURCES LTD. UG Drawn: S.Coleman Approved: G.Richards MB5-D JMB05-D MB15 JMB15 M53/191 Date: March 2015 261000mE 261500mE 262000mE 263000mE JUNDEE TAILINGS STORAGE FACILITY Scale: 1:10 000 BORE LOCATION PLAN Figure No. 4 L/G A3 Plan No. N0100-007 7079500mN 7080500mN 7080000mN MB5 259000mE NMB05 259000mE Author: G.R. / S.C. Date: March 2015 Scale: 1:10 000 Figure No. 5 Plan No. N0100-008 A4 Seepage Bore Seepage Reclaim Bore Decommissioned Compliance Bore Compliance Bore Monitoring Hydrocarbon Bore Monitoring Note: D = Deep Piezometer S = Shallow Piezometer Legend Note: Previous Bore Names text size. in Grey with smaller JUNDEE OPERATIONS 258500mE 258500mE JHM5 Project: NMB04-D MB7-D NSF02 MB4-D NHMB02 NMB07-D NRB02 NSFE7 MB6 NMB14 NMB03-S NMB03-D NMB06 BORE LOCATION PLAN MB3-S MB3-D NMB10-D NMB10-S NRB03 NMB02-D NMB02-S NSFP4 NMB15 500 NORTHERN STAR NMB01-S NMB01-D RESOURCES LTD. NIMARY TAILINGS STORAGE FACILITY NSFP6 MB2-D MB2-S MB10-S(2) NRB01 MB10-D(2)

258000mE NMB12 258000mE MB1-S MB1-D NMB11 NHMB01 CL3/2 NSF01 Client: CL3/3 JHM4 MB10(1) NMB09-D NMB09-S N Metres NMB13 MB9-D MB9-S MB8 SCALE 1 : 10 000 NMB08 MAP GRID OF AUSTRALIA Grid based on Transverse Mercator Projection 0 7081000mN 7079500mN 7080000mN 7080500mN 7081500mN 257500mE Checked: G.Richards Approved: G.Richards 262500mE 267500mE 265000mE 257500mE 260000mE Legend Production Bore M53/461 TSF 2 Inactive M53/193 Production Bore M53/446 L53/153 Monitoring Bore JEW42 M53/552 Hydrocarbon Keating TSF 1 Monitoring Bore Jundee Nimary M53/191 L53/138 Camp Cook L53/72 Soak Bioremediation Menzies JHMB03 Monitoring Bore COOK Plover Bore JHMB02 Bores destroyed Reid W10 W6 & W7 "Jundee" 7082500mN JHMB01 M53/929 and / or removed N1P4 Curtin Jundee from monitoring JBRP2 Bioremediation Clay Plant L/G schedule Nim 1&2 Stockpile Landfarm NM1/12 North West JBRP1 JBP5 Soil Sampling NM1/13 N6P1 W3 L53/099 Nim 1/2 JCSP1 FMB10 Site Waste NM6X7 Barton FMB09 Bioremediation Dump Nim 6 JBP6 FMB11 NIM 6 NM6X4 Fisher W4 Area Waste Deakin M53/414 Dump N6P2 Lyons FMB12 OS M53/193 NHMB02 Moore NHMB01 JMP10 FMB13 Nim 7 NM6X9 N Nimary NM3/18 Main Plant JMP8 Nim 3 Hughes W1 N3P11A M53/191 TSF N3P10 T/N JMP7 7080000mN M53/874 7080000mN NM4/14 Nim 4 W1 & W2 N4P3 Kestrel M53/413 Nim 4 NM4/12 Waste N4P6 N4P7 Munday Bore Camel Bore SCALE 1 : 50 000 Dump 0 2.5 NIM Kilometres Waste M53/192 Dump MAP GRID OF AUSTRALIA

257500mE 260000mE Grid based on Transverse Mercator Projection Nimary Bore M53/412 Jundee Camp

L53/143 L53/136 Client: NORTHERN STAR 7077500mN RESOURCES LTD.

Author: G.Richards Checked: G.Richards Project: JUNDEE OPERATIONS M53/477 Drawn: S.Coleman Approved: G.Richards

Date: March 2015 M53/226 262500mE 265000mE 267500mE JUNDEE - NIMARY Scale: 1:50 000 M53/478 M53/707 Elliot MINING AREA PLAN Figure No. 6 EWE4 EWE8 A4 Plan No. N0100-005 Sandhill Well JEW 31 From Pits: Deacon Hughes Borefield Dingo Well Nim 3 Keating Northwest Borefield 1 JSP3 Midas Cook Gateway (Nim 4) 56 TP2 2 JSP4 Coreshed W1 JEW 15 Barton Sump (Jundee and Nimary) 57 TP3 3 JSP5 (including ERT) 4 JSP8A Coreshed Underground 5 JSP9 Tank Byrnecut 3 Showers 6 JSP11 195m U/G Workshop Mine Area 7 TP4 11 7 JSP12 Dewatering Strickland BCM Surface Henry Ward 59 8 JSP14 Washpad 9 JSP15A Plant 14 Nimary Work Area 10 JSP16A Fire Water Rehabilitation U/G Admin Hamptons Contractor Crib Room Offices & SGS Raw Water Toilets Tank Workshop Facilities 72 Hamptons Overflow Emergency Raw / Fire Use Line Low TDS Water Only 13 Tank

Powerhouse Jundee Process FRB01 HWE (77) Elution Ore Water Dam 22 85 Moisture Fisher Recovery FRB05 Collection Tank 23 Water Potable Tank Softening Potable 61 FRB04 Elution & Electro Treatment 24 Stripping Whining Plant R/O Plant 76 15 25

Tails Magflow Plant and Fresh From TSF 2 TSF 1 Offices Drinking Water Fisher Pit Acid Wash Recovery Recovery & Domestic Tank Recovery Dam Dam 20 Production Bore TSF 2 84 60 JRB10 JRB11 Flow Meter 80 JRB06 21 63 JRB01 JRB12 Valve JVP 1 (JEW 272) 18 64 JRB02 JRB13 Industrial Water JRB07 81 Seepage Seepage Interception Interception Trench Pond (skipark) 65 JRB03 JRB15 Waste Water JEW 13 JRB08 82 JRB04 Recycled Water 17 78 Potable Water MZ1 JRB09 83 JRB14 JRB05 16 79 Fresh Water

Client: NORTHERN STAR Date: March 2015 RESOURCES LTD. JUNDEE PLANT RAW AND POTABLE Scale: NTS Author: R.Hollis Checked: G.Richards Project: Figure No. 7a JUNDEE OPERATIONS WATER CIRCUIT SCHEMATIC Drawn: S.Coleman Approved: G.Richards A4 Plan No. N0100-068 Area 7 Henry Ward Strickland

Invicta UG 14 75 28 Rainfall Evaporation JBRP1 Dust Suppression 34 Raw Water Tank Northwest Invicta Rainfall Evaporation TN JCSP1 25 29 33 Rainfall Evaporation 26 73 Byrnecut Main Workshop TN Cook / Keating W1 Jundee Process Deakin New Central 31 Water Dam 27 Storage Point

46 S/P for Dust Suppression

? Barton 36 69 Underground 70 Main PIt

Rainfall Evaporation Evaporation 38 Rainfall 68 Gateway Nim 3 TN U/G Barton TN 43 Overflow from 47 45 Barton Sump Production Bore to Fisher Pit 42 Barton Level 4 Gateway Midas Clean Water Surface Water Tanks Monitoring Points Dam 44 Flow Meter Nim 4 Nim 3 Barton Recommended Runoff Dam Flow Meter

Industrial Water

Client: NORTHERN STAR Date: March 2015 RESOURCES LTD. JUNDEE - NIMARY Scale: NTS Author: D.Reissen Checked: G.Richards Project: Figure No. 7b JUNDEE OPERATIONS MINE DEWATERING WATER CIRCUIT SCHEMATIC Drawn: S.Coleman Approved: G.Richards A4 Plan No. N0100-127 Legend Recovery Bore 434.20 Water Levels - December 2017 (metres AHD) Monitoring Bore -1.47 Annual Change - December 2017 (metres rise / fall since December 2016) Flow Direction NA Not Available Note: - denotes fall, + denotes rise 260500mE 261500mE

N Clay SCALE 1 : 10 000 Stockpile 0 500

Metres MAP GRID OF AUSTRALIA Grid based on Transverse Mercator Projection GDA 1994 MGA Zone 51

W6 & W7

7082000mN 7082000mN

525 520 530

515 W3 510 535 505 500

531.18 FMB10 BARTON 1.21 495 534.54 FMB08 FMB09 1.00 540 W4

FMB07 FRB04 490.88 FMB11 500 8.92 533.19 7081500mN 7081500mN FRB05 3.45 493.48 N/A FISHER IPTSF FRB01 FMB06 525 519.75 0.09 542.90 FMB12

0.24 LYONS 495 FMB04 506.95 FMB05 N/A 540.65 E 1.92 540

7081000mN 7081000mN 535

530

525

520

500 MAIN

515

505 NIM 3 510

7080500mN 7080500mN

HUGHES 261000mE 261500mE 260500mE W1 & W2

Client: NORTHERN STAR Project: Date: February 2018 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:10 000

A4 Author: R.H. / S.C. FISHER INPIT TSF - INTERPRETED Checked: S.Wimbridge Figure No. 8 POTENTIOMETRIC LEVELS AS AT DECEMBER 2017 Approved: G.Richards Plan No. N0100-316 Legend Recovery Bore 15.32 Water Depths - December 2017 (mbgl) Monitoring Bore NA Not Available 260500mE 261500mE

N Clay SCALE 1 : 10 000 Stockpile 0 500

Metres MAP GRID OF AUSTRALIA Grid based on Transverse Mercator Projection GDA 1994 MGA Zone 51

W6 & W7

7082000mN 7082000mN

W3

40

35 30

45 25

50 20 55 21.88 FMB10

BARTON 15 60 N/A

FMB08 FMB09 18.28 W4 N/A FMB07 FRB04 61.07 FMB11 19.85 7081500mN 60.78 FRB05 7081500mN 50 FISHER IPTSF N/A FMB06 FRB01 34.61 25

FMB12 11.83 LYONS FMB04

48.97 FMB05

12.90 E 15 60

7081000mN 7081000mN

20

25 30

MAIN 35

55 NIM 3 40

45 50 7080500mN 7080500mN

HUGHES 261000mE 261500mE 260500mE W1 & W2

Client: NORTHERN STAR Project: Date: February 2018 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:10 000

A4 Author: R.H. / S.C. FISHER INPIT TSF - WATER DEPTHS (mbgl) Checked: S.Wimbridge Figure No. 9 AS AT DECEMBER 2017 Approved: G.Richards Plan No. N0100-317 262500mE 262000mE 263000mE 264000mE 264500mE 543.36 263500mE

535.89 540 Legend Flow Direction 535 530 1.28 1.36 N

Monitoring Bore Compliance Bore 541.99

535 JMB26 540 540 7085000mN 540 JMB13-D 530 -1.27 520 JMB29 GRSMP Seepage Indication / Recovery Bore 525 538.62 JMB25 JMB28 JRB08 JMB27 JRB09 0.59

Seepage Indication / Recovery Bore JRB14 544.80 539.30 JMB24 540 JMB43 515 508.13

0.98 510.85 -26.43 0.65

Water Levels 518.85 541.57 520 L53/72 434.20 5.00 -24.04 December 2017 (metres AHD) 0.86

SCALE 1 : 10 000 Annual Change - December 2017 525 -1.47 540 JMB07-D (metres rise / fall since December 2016) 0 500

540.64 JMB21 N/A Not Available 541.63 530 1.55 540.29 Metres 0.96 538.47 1.12 MAP GRID OF AUSTRALIA

530.73

Note: - denotes fall, + denotes rise JMB23A 0.95 Grid based on Transverse Mercator Projection 4.05 535 GDA 1994 MGA Zone 51 D = Deep Piezometer JRB11 S = Shallow Piezometer JRB05

7084500mN JMB44 7084500mN 261000mE 540 261500mE 535 TSF 2

546.80 L53/153 0.96 JMB08-D 543.50 530 JMB01-D 1.04 545 525 JRB04 520 510.44 -5.36 M53/552 539.72 JMB22 0.64 539.80 542.86 JMB14 0.69 0.29 540 JMB46 7084000mN JMB09-D 7084000mN JMB12-D 540.42 0.62 JMB47 JRB06

535 535 517.01 JRB12 498.77 -22.89 -39.49

530 520

M53/193 JMB10-D 542.28 525 525 JRB07 0.37

530

520 515 507.40 544.12 -32.42 4.55

JRB13 528.60

JRB03 -12.13 535 540 JMB45 7083500mN JMB03-D 7083500mN 540 JMB17 513.18 543.69 N/A 1.37 TSF 1 JRB15 535 515

JRB02 JMB11-D 543.43 520 510.18 1.30

530 525 -27.29 539.65 541.04 0.81 JMB06-D JMB04-D 1.10 JMB19 JMB20 544.52 JRB01

0.19 538.67

545 540.80 L53/72 0.41 5.74 540 M53/929 7083000mN 7083000mN 263500mE 264000mE 264500mE

M53/552 M53/874 Bioremediation L53/153 Landfarm 540.48 Client: JUNDEE OPERATIONS Plover Bore 543.94 0.17 -1.44 Project: W6 & W7 NORTHERN STAR JMB16 Author: R.Hollis Checked: S.Wimbridge

JMB05-D 535 RESOURCES LTD. UG 530 M53/191 522.31 Drawn: S.Coleman Approved: G.Richards -1.34 Date: February 2018 261000mE 261500mE 545 262000mE 263000mE JUNDEE TAILINGS STORAGE FACILITY

JRB10 538.14 Scale: 1:10 000 1.85 540 INTERPRETED POTENTIOMETRIC LEVELS

Figure No. 10 535 JMB15 AS AT DECEMBER 2017 540 L/G A3 Plan No. N0100-319 262500mE 262000mE 263000mE 264000mE 264500mE 263500mE

Legend 20 2.13 10 15 8.96 N 10

5 JMB26

Monitoring Bore 20

7085000mN 15 5 JMB13-D 10 4.84 JMB29 25 3.86

Compliance Bore JMB25 JMB28 JRB08 36.41 5 JMB27 GRSMP Seepage Indication / Recovery Bore 0.97 JRB09 4.28 JMB24 JRB14 N/A JMB43 34.31 Seepage Indication / Recovery Bore 28.90 30

5.91 L53/72 Note: D = Deep Piezometer 25 S = Shallow Piezometer SCALE 1 : 10 000

20 JMB07-D

15.32 Water Depths - December 2017 (mbgl) 0 500 10 3.68 JMB21 N/A Not Available 15 3.59 Metres MAP GRID OF AUSTRALIA 261000mE 261500mE Grid based on Transverse Mercator Projection JMB23A 5.87 15.30 GDA 1994 MGA Zone 51

5.81 10 JRB11

JRB05 7084500mN 15 JMB44 N/A 7084500mN

TSF 2 5 L53/153

0.11 20 JMB08-D 0.42 JMB01-D

JRB04 25

30 37.11 M53/552 JMB22 2.63 2.70

N/A JMB14 5 0.97 JMB46 7084000mN JMB09-D 7084000mN JMB12-D

JMB47 2.55 10 JRB06 N/A 26.37 30 JRB12 45.36 15 10 35 M53/193 JMB10-D 1.60 30 JRB07 25 25 36.22

5 2.05 20 JRB13 15.79

10 JRB03 JMB45 N/A 15 7083500mN JMB03-D N/A 7083500mN JMB17 10 15 2.29 32.30 TSF 1 JRB15 5 30 JMB11-D 1.59 JRB02 20 36.10 10 5 4.13 JMB06-D JMB04-D 5.34 JMB19 JMB20 13.15 JRB01 4.54 5.64 L53/72 M53/929 7083000mN 7083000mN 263500mE 264000mE 264500mE

M53/552 M53/874 Bioremediation L53/153 Landfarm Client: JUNDEE OPERATIONS Plover Bore 7.93 10.14 Project: W6 & W7 NORTHERN STAR JMB16 Author: R.Hollis Checked: S.Wimbridge JMB05-D RESOURCES LTD. M53/191 UG Drawn: S.Coleman Approved: G.Richards

Date: February 2018

20 10 15 261000mE 261500mE 262000mE 263000mE

15 32.22 JRB10 5 JUNDEE TSF2 - WATER DEPTHS (mbgl) Scale: 1:10 000

20 17.01 AS AT DECEMBER 2017 Figure No. 11 25 JMB15 L/G A3 Plan No. N0100-320 Legend Flow Direction 434.20 Water Levels - December 2017 (metres AHD) Compliance Bore Seepage Bore -1.47 Annual Change - December 2017 (metres rise / fall since December 2016) Monitoring Bore Note: - denotes fall, + denotes rise Reclaim Bore Decommissioned 259000mE 258500mE 258000mE NIM 6 WASTE DUMP

Nimary Plant (Decommissioned)

NIM 7 540 7081000mN 7081000mN

535 545 NMB07-D

NMB12

NRB01 NMB03-D 538.76 530 -1.89

7080500mN NMB08 7080500mN 546.09 0.43

NMB14 TSF NRB03

NMB13 NMB02-D T/N 542.31 -0.94 NMB09-D 547.46 -0.11 NMB15 540 530 7080000mN 7080000mN NMB01-D 547.05 -0.32 525

NMB04 524.12 NIM 4 -2.93

N N4P6 545.74 N/A 7079500mN NMB10-D 7079500mN

SCALE 1 : 10 000 NIM 4

WASTE 0 500 530 DUMP Metres

MAP GRID OF AUSTRALIA 258500mE 535 Grid based on Transverse Mercator Projection 259000mE 545 GDA 1994 MGA Zone 51

540

Client: NORTHERN STAR Project: Date: February 2018 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:10 000 NIMARY TAILINGS STORAGE FACILITY Author: R.H. / S.C. Checked: S.Wimbridge INTERPRETED POTENTIOMETRIC LEVELS Figure No. 12 Approved: G.Richards AS AT DECEMBER 2017 A4 Plan No. N0100-322 Legend Compliance Bore Seepage Bore 15.32 Water Depths - December 2017 (mbgl) Monitoring Bore NA Not Available Reclaim Bore Decommissioned 259000mE 258500mE 258000mE NIM 6 WASTE DUMP

Nimary Plant (Decommissioned)

25 NIM 7 30 7081000mN 7081000mN

20 35 N/A NMB07-D

N/A

NMB12 40

NRB01 N/A NMB03-D

15 26.98 7080500mN NMB08 7080500mN45 16.95

NMB14 N/A TSF N/A NRB03 N/A NMB13 NMB02-D T/N 20.39 NMB09-D

14.56 NMB15 N/A

7080000mN 7080000mN 50 10 NMB01-D 14.52

NMB04 54.72 50NIM 4

N

N4P6

10 12.88 7079500mN NMB10-D 7079500mN 45 SCALE 1 : 10 000 NIM 4 0 500 WASTE DUMP 40 Metres 35

15 30 MAP GRID OF AUSTRALIA 20 25 258500mE Grid based on Transverse Mercator Projection 259000mE GDA 1994 MGA Zone 51

Client: NORTHERN STAR Project: Date: February 2018 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:10 000

Author: R.H. / S.C. NIMARY TSF - WATER DEPTHS (mbgl) Checked: S.Wimbridge Figure No. 13 AS AT DECEMBER 2017 Approved: G.Richards A4 Plan No. N0100-323 Legend Recovery Bore 1900 Groundwater Salinity - December 2017 (mg/L TDS) Field Results Monitoring Bore N/A Not Available 260500mE 261500mE

N Clay SCALE 1 : 10 000 Stockpile 0 500

Metres MAP GRID OF AUSTRALIA Grid based on Transverse Mercator Projection GDA 1994 MGA Zone 51

W6 & W7

7082000mN 7082000mN

W3 3000

FMB10 3170

BARTON

5000 3000 4000 N/A FMB08

FMB09 7460 4000 W4 N/A FMB07 FRB04 N/A FMB11

N/A FRB05 1630

7081500mN 5000 7081500mN

FISHER 6000 IPTSF 7000

N/A FMB06 FRB01 10000 N/A 8000

FMB12 N/A

LYONS FMB04 14020 9000 5490 FMB05 12000

E 11000 10000

7081000mN 7081000mN 5000 10000

9000

MAIN

8000

6000 NIM 3 7000

7080500mN 7080500mN

HUGHES 261000mE 261500mE 260500mE W1 & W2

Client: NORTHERN STAR Project: Date: February 2018 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:10 000

A4 Author: R.H. / S.C. FISHER INPIT TSF Checked: S.Wimbridge Figure No. 14 GROUNDWATER SALINITY AS AT DECEMBER 2017 Approved: G.Richards Plan No. N0100-318 262500mE 262000mE 263000mE 264000mE 264500mE 263500mE

2000 2500 1500 Legend 3000

1620 3230 Monitoring Bore JMB13-D 2000 JMB26

7085000mN 765 JMB29 2500 1000 1067 Compliance Bore JMB25 JMB28 JRB08 JMB27 GRSMP Seepage Indication / Recovery Bore 1700 JRB09 2250 JMB24 JRB14 JMB43 Seepage Indication / Recovery Bore 1008

L53/72

Note: D = Deep Piezometer S = Shallow Piezometer 2000 JMB07-D Groundwater Salinity - December 2017 1520 JMB21 (mg/L TDS) Field Results 2000

1510 JMB23A 2500 M53/552 261000mE 261500mE JRB11 JRB05 7084500mN JMB44 7084500mN

TSF 2 3000

L53/153 JMB08-D

JMB01-D 3500

JRB04 3500

JMB22 4950

3000 JMB14 JMB46 7084000mN JMB09-D 4500 7084000mN JMB12-D JMB47 4210 4000 2500 JRB06 3500

JRB12 1500 M53/193 JMB10-D JRB07 3000

2000

N JRB13 2500 JRB03 JMB45 7083500mN JMB03-D 7083500mN JMB17 2000 TSF 1 SCALE 1 : 10 000 JRB15 JMB11-D 2240 1500 0 500 JRB02

Metres MAP GRID OF AUSTRALIA 1056 Grid based on Transverse Mercator Projection JMB06-D JMB04-D JMB19 1000 GDA 1994 MGA Zone 51 1640 JMB20 JRB01 663 L53/72 M53/929 7083000mN 7083000mN 263500mE 1500 264000mE 264500mE M53/552

Bioremediation L53/153 Landfarm Client: JUNDEE OPERATIONS Plover Bore M53/874 1430 Project: W6 & W7 NORTHERN STAR JMB16 Author: R.Hollis Checked: S.Wimbridge JMB05-D RESOURCES LTD. M53/191 UG Drawn: S.Coleman Approved: G.Richards Date: February 2018 261000mE 261500mE 262000mE 263000mE JUNDEE TAILINGS STORAGE FACILITY JRB10 Scale: 1:10 000 GROUNDWATER SALINITY Figure No. 15 JMB15 AS AT DECEMBER 2017 1000 L/G A3 Plan No. N0100-321 Legend Compliance Bore 1900 Groundwater Salinity - December 2017 (mg/L TDS) Field Results Seepage BoreN/A Not Analysed Note: D = Deep Piezometer 259000mE 258500mE 258000mE NIM 6 WASTE DUMP

Nimary Plant (Decommissioned) NIM 7

7081000mN 7081000mN

N/A NMB07-D

NMB03-D N/A

7080500mN NMB08 7080500mN 2620

TSF

NMB02-D

N/A T/N

NMB09-D 510

7080000mN 7080000mN NMB01-D N/A

NMB04 3480 NIM 4

N

546 7079500mN NMB10-D 7079500mN

SCALE 1 : 10 000 NIM 4 0 500 WASTE DUMP Metres MAP GRID OF AUSTRALIA Grid based on Transverse Mercator Projection 258500mE 259000mE GDA 1994 MGA Zone 51

Client: NORTHERN STAR Project: Date: February 2018 JUNDEE OPERATIONS RESOURCES LTD. Scale: 1:10 000 NIMARY TAILINGS STORAGE FACILITY Author: R.H. / S.C. Checked: S.Wimbridge GROUNDWATER SALINITY Figure No. 16 Approved: G.Richards AS AT DECEMBER 2017 A4 Plan No. N0100-324 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations

APPENDIX A

GLOSSARY - Units & Terms

SAPROLITE ENVIRONMENTAL Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations GLOSSARY

Units km Kilometre ha Hectare = 10,000m2 kL Kilolitre = 1m3 ML Megalitre = 1,000m3 GL Gigalitre = 1,000,000m3 MTPA Million Tonnes Per Annum mg/L Milligrams per litre

Terms

Abstraction Pumping groundwater from an aquifer

Alluvium (alluvial) Detrital material transported by streams and rivers

Aquifer A geological formation or group of formations able to receive, store and transmit significant quantities of water Basin A discrete Phanerozoic age (less than 545Ma) geological structure containing sedimentary and sometimes volcanic rocks and groundwater resources with porous, permeable formations Bedrock General term for solid rock underlying unconsolidated materials

Bore Drilled small diameter well, usually lined with steel or plastic casing for the purpose of obtaining or monitoring groundwater Brackish Water containing between 1,500 and 3,000 mg/L total dissolved solids (TDS), tasting slightly salty Cavitation A phenomena of cavity formation, or formation and collapse, especially in regard to pumps, when the absolute pressure within the water reaches the vapour pressure causing the formation of vapour pockets Colluvium (colluvial) Detrital material transported by gravity down slopes

Confined aquifer An aquifer located between upper and lower layers of low permeability

Dewatering Removal of free-draining water resulting in lowering the watertable and reduction of groundwater in storage Drawdown The distance between the static water level and the surface of the cone of depression

Formation A lithological distinctive stratum or sequence of rocks deposited during a finite period and constituting a mappable unit Fractured rock aquifer Crystalline rocks that yield economic supplies of groundwater from fractures or weathering profiles Fresh Water containing less than 500mg/L TDS, and generally suitable for drinking

Groundwater Water occurring below the land surface in the saturated zone in pores and fissures, generally in motion and part of the hydrologic cycle Hydraulic conductivity A measure of the rate at which water moves through a porous medium

Hydrogeology Science concerned with the study of groundwater occurrence and movement and its relation to the geological environment

SAPROLITE ENVIRONMENTAL Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations Inferred A geological boundary or resource estimate that is based on experience, comparisons to geological relationships, and has not necessarily been ground truthed or verified from field investigations or drilling. Karst A type of topography produced by solution and collapse of limestone formations

Leakage Vertical (and or horizontal) flow of groundwater from one aquifer to another, generally through a less permeable layer Marginal quality Water containing between 500 and 1,500mg/L TDS, in the upper range of acceptability for drinking Outcrop Portion of land surface occupied by a particular geological formation

Permeability A measure of the rate at which fluid or gas can move through a porous medium

Potentiometric surface The level to which water from a confined aquifer will rise

Recharge The water that infiltrates the watertable originating from rainfall and streamflow

Renewable resources The amount of groundwater that accrues each year from recharge

Saline Water containing more than 3,000mg/L TDS

Salinity A measure of the concentration of total dissolved solids (TDS)

Specific capacity The rate of discharge of a water well per unit of drawdown, commonly expressed in m3/day/m. It varies with duration of discharge

Specific yield The volume of water that an unconfined aquifer releases from storage per unit surface area of the aquifer per unit decline in the watertable Storage coefficient The volume of water that a confined aquifer releases from storage per unit surface area of aquifer per unit decline in the potentiometric surface Sustainable yield The amount of groundwater that may be abstracted from an aquifer in perpetuity without adverse impact Transmissivity The rate at which water is transmitted through a unit width of an aquifer under a unit hydraulic gradient; in the International System, transmissivity is given in m3/day through a vertical section of an aquifer one meter wide and extending the full saturated height of an aquifer under a hydraulic gradient of 1. Throughflow The process or amount of groundwater flowing through an aquifer

Unconfined aquifer An aquifer overlying a relatively impermeable layer which is saturated from the watertable (at atmospheric pressure) downwards and generally with free vertical infiltration of recharge from the surface Weathering Process whereby surface rock materials are broken down and chemically altered by exposure and biological agents Well A hole or dug excavation designed to facilitate the abstraction of groundwater (term also applied to drilled bores) Wellfield (borefield) A group of wells or bores used together to provide a groundwater supply

Yield The amount of water that can practically be pumped from a well/bore or aquifer

SAPROLITE ENVIRONMENTAL Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations

APPENDIX B

Bore Construction Details

SAPROLITE ENVIRONMENTAL Northern Star Resources Ltd BORE CONSTRUCTION DETAILS Jundee Operations JUNDEE TSF BORES Annual Environmental Report

Topof EOH Casing Slotted DER StickͲUp WaterDepth NewBoreName Easting(MGA) Northing(MGA) CasingRL Depth Depth Status Interval Comments Type (magl) (mbRP) (mAHD) (mbgl) (mbgl) (mbgl) JundeeTailingsStorageFacilityͲRecoveryBores JRB01 RB 262870.99 7083139.07 546.96 0.52 TopofPVCPipe JRB02 RB 262803.11 7083321.16 546.55 0.27 TopofPVCPipe JRB03 RB 262700.15 7083587.61 547.07 0.90 TopofPVCPipe JRB05 SI 262408.62 7084556.02 546.68 0.65 Topofcasing JRB06 SI 263414.34 7083959.15 543.90 0.52 Topofcasing JRB07 SI 263349.07 7083761.35 544.12 0.50 Topofcasing JRB08 CB 263271.12 7084990.40 545.06 0.52 Topofcasing JRB09 RB 263169.52 7084950.79 545.49 44.00 43.70 0.33 3.94 1.70Ͳ43.70 Topofcasing JRB10 RB 262674.46 7082647.06 555.40 48.00 45.77 0.87 10.98 3.77Ͳ45.77 Topofcasing JRB11 Rec 263478 7084544 544.97 48.00 48.00 0.63 2.74 3.52Ͳ48.00 JRB12 Rec 263514 7083872 544.77 48.00 48.00 0.64 2.53 2.52Ͳ48.00 JRB13 Rec 263197 7083626 545.63 48.00 48.00 1.24 1.37 2.83Ͳ48.00 JRB14 Rec 262280 7084937 548.65 48.00 48.00 0.90 4.31 1.60Ͳ48.00 JRB15 Mon 262925 7083387 546.18 42.00 42.00 0.70 2.80 0.00Ͳ42.00 JundeeTailingsStorageFacilityͲSeepageIndication JMB17 SI 262756.33 7083483.30 546.22 0.24 RLfromsiteDatabase(CollarRL) JMB1ͲD SI 262416.55 7084287.71 547.17 0.26 TopofPVCPipe JMB4ͲD SI 262862.35 7083160.20 546.74 0.36 TopofPVCPipe JMB7ͲD SI 263502.03 7084775.18 544.62 0.30 TopofPVCPipe JMB8ͲD SI 263423.84 7084327.46 544.29 0.37 TopofPVCPipe JMB9ͲD SI 263403.85 7083984.30 544.39 0.56 TopofPVCPipe JMB10ͲD SI 263387.14 7083792.54 544.38 0.50 TopofPVCPipe JMB10ͲS SI 263384.80 7083791.92 544.42 TopofPVCPipe JMB14 Mon 263872.78 7084081.01 542.89 31.00 28.90 0.54 3.10 4.9Ͳ28.9 JMB15 Mon 262749.21 7082556.65 555.51 48.00 47.35 0.36 11.40 5.35Ͳ47.35 TopofPVCPipe JMB16 Mon 262938.97 7082640.99 548.67 48.00 47.47 0.26 5.75 5.47Ͳ47.47 TopofPVCPipe

SAPROLITE ENVIRONMENTAL Page 1 of 4 16/03/2018 Northern Star Resources Ltd BORE CONSTRUCTION DETAILS Jundee Operations JUNDEE TSF BORES Annual Environmental Report

Topof EOH Casing Slotted DER StickͲUp WaterDepth NewBoreName Easting(MGA) Northing(MGA) CasingRL Depth Depth Status Interval Comments Type (magl) (mbRP) (mAHD) (mbgl) (mbgl) (mbgl) JundeeTailingsStorageFacilityͲComplianceBores JMB5ͲD CB 262161.00 7082639.00 554.78 0.70 TopofPVCPipe JMB5ͲS CB 262163.00 7082639.00 554.78 0.70 TopofPVCPipe JMB6ͲD CB 261732.57 7083223.30 558.06 0.39 1 TopofPVCPipe JMB6ͲS CB 261732.66 7083223.39 558.06 0.39 TopofPVCPipe JMB11ͲD CB 263033.82 7083336.26 545.52 36.00 35.70 0.50 1.72 17.7Ͳ35.7 JMB11ͲS CB 263035.76 7083333.52 545.50 7.10 7.10 0.49 1.69 1.1Ͳ7.1 JMB12ͲD CB 263717.91 7084000.89 543.52 36.00 35.80 0.55 3.00 17.8Ͳ35.8 JMB12ͲS CB 263718.79 7083998.30 543.52 7.10 7.10 0.57 2.97 1.1Ͳ7.1 JMB13ͲD CB 262739.69 7085019.90 546.00 42.00 41.70 0.51 4.01 23.7Ͳ41.7 JMB13ͲS CB 262742.43 7085019.68 546.30 7.10 7.10 0.52 4.54 1.1Ͳ7.1 JMB19 CB 264145.10 7083189.92 543.64 0.43 RLfromsiteDatabase(CollarRL) JMB20 CB 263604.87 7083154.34 544.42 0.64 TopofPVCPipe JMB21 CB 263759.37 7084737.04 543.93 0.05 TopofPVCPipe JMB22 CB 264157.03 7084159.02 542.54 0.04 Topofcasing JMB23A CB 262215.41 7084617.61 547.44 0.00 TopofPVCPipe JMB24 CB 262080.70 7084923.67 547.48 0.00 TopofPVCPipe JMB25 CB 262570.39 7084980.66 546.83 0.00 TopofPVCPipe JMB26 CB 264662.24 7085039.81 542.75 0.27 TopofPVCPipe JMB27 CB 263970.31 7085005.18 543.80 0.22 TopofPVCPipe JMB28 CB 262922.76 7084983.06 545.87 0.10 TopofPVCPipe JMB29 CB 263327.37 7085026.70 544.85 0.00 TopofPVCPipe JundeeHydrocarbonMonitoring JHMB1 HCͲMon 262476.19 7081955.03 550.70 31.000 30.10 0.87 5.18 12.1Ͳ30.1 JHMB2 HCͲMon 262314.10 7081967.54 550.54 31.000 28.90 0.60 4.63 10.9Ͳ28.9 JHMB3 HCͲMon 262341.25 7082136.73 550.78 31.000 19.30 0.51 4.78 7.3Ͳ19.3

SAPROLITE ENVIRONMENTAL Page 2 of 4 16/03/2018 Northern Star Resources Ltd BORE CONSTRUCTION DETAILS Jundee Operations FISHER IN-PIT TSF BORES Annual Environmental Report

NewBore DER TopofCasingRL EOHDepth CasingDepth StickͲUp WaterDepth SWL SlottedInterval Easting(MGA) Northing(MGA) Comments Name Type (mAHD) (mbgl) (mbgl) (magl) (mbRP) mAHD (mbgl)

FisherInpitTailingsStorageFacilityͲRecoveryBores FRB01 RB 260914.60 7081361.43 554.560 100 97.00 0.20 82.10 472.460 7Ͳ97 155mmCased FRB02 Aban 260835.60 7081543.43 554.480 100 99.00 71.40 483.080 3Ͳ99 Collapsed,155mmCased FRB03 Aban 260907.60 7081618.43 552.840 84 84.00 56.68 496.160 6Ͳ84 COLLAPSED,155mmCased FRB04 RB 260910.20 7081618.14 552.880 80 79.67 0.93 25.50 527.380 7.67Ͳ79.67 FMB3Replacement FRB05 RB 260835.60 7081543.43 554.480 90 89.70 0.22 37.40 517.080 59.7Ͳ77.7;83.7Ͳ89.7 FMB2Replacement FisherInpitTailingsStorageFacilityͲMonitorBores FMB04 MB 261144.60 7081220.42 554.150 103 102 0.60 66.84 487.310 7Ͳ102 155mmCased FMB09 MB 261169.31 7081625.83 552.867 84 0.05 24Ͳ60 FMB10 MB 261056.41 7081792.63 553.470 89 0.41 42Ͳ90 FMB11 MB 261253.00 7081590.00 553.090 >105 0.05 FMB12 MB 261200.00 7081250.00 554.780 0.05

SAPROLITE ENVIRONMENTAL Page 3 of 4 16/03/2018 Northern Star Resources Ltd BORE CONSTRUCTION DETAILS Jundee Operations NIMARY TSF BORES Annual Environmental Report

Casing NewBore Northing TopofCasing EOHDepth StickͲUp WaterDepth SWL SlottedInterval DERType Easting(MGA) Depth Comments Name (MGA) RL(mAHD) (mbgl) (magl) (mbRP) mAHD (mbgl) (mbgl) NimaryTailingsStorageFacilityͲSeepageIndicationBores NMB1ͲD SI 258228.66 7080028.17 562.065 0.5 TopofPVCPipe NMB2ͲD SI 258277.69 7080291.85 563.329 0.63 TopofPVCPipe NMB3ͲD SI 258405.66 7080703.46 566.062 0.32 TopofPVCPipe NimaryTailingsStorageFacilityͲComplianceBores NMB4ͲD CB 258592.1 7079863.81 579.290 0.45 TopofPVCPipe NMB7ͲD CB 258355.61 7080887.73 572.009 0.25 TopofPVCPipe NMB8 CB 257827.29 7080535.24 563.492 0.45 TopofPVCPipe NMB9ͲD CB 258019.93 7080160.2 562.642 0.62 TopofPVCPipe RLfromsiteDatabase(CollarRL).Coordinatesstill NMB10ͲD CB 258233.01 7079489.86 559.181 76.000 75.30 0.56 7.77 45.3Ͳ75.3 required NMB10ͲS CB 258230.87 7079492.67 559.170 12.700 12.700 0.56 7.170 0.7Ͳ12.7

SAPROLITE ENVIRONMENTAL Page 4 of 4 16/03/2018 Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations

APPENDIX C

DER Licence 6498/1995/11

SAPROLITE ENVIRONMENTAL

Licence

Environmental Protection Act 1986, Part V

Licensee: Northern Star Resources Ltd

Licence: L6498/1995/11

Registered office: Level 1 388 Hay St SUBIACO WA 6008

ACN: 092 832 892

Premises address: Jundee Operations SHIRE OF WILUNA WILUNA WA 6646 Mining tenements: G53/20, L53/52, L53/60, L53/68, L53/69, L53/70 - L53/73, L53/75, L53/99, L53/100, L53/102, L53/112, L53/113, L53/117, L53/136 - L53/138, L53/142, L53/143, L53/153, L53/169, L53/174, M53/155, M53/156, M53/182, M53/191, M53/192, M53/196 - M53/198, M53/199, M53/221, M53/226, M53/228 - M53/230, M53/235 - M53/237, M53/245 - M53/250, M53/326, M53/347, M53/372, M53/412 - M53/414, M53/441, M53/446, M53/451, M53/452, M53/461, M53/477 - M53/480, M53/492, M53/535 - M53/541, M53/552, M53/588, M53/589, M53/611, M53/707, M53/708, M53/711, M53/712, M53/836, M53/874, M53/895, M53/911, M53/929, M53/935, M53/940, M53/966, PL34 as depicted in Schedule 1.

Issue date: Thursday, 21 November 2013

Commencement date: Friday, 22 November 2013

Expiry date: Thursday, 21 November 2024

Prescribed premises category Schedule 1 of the Environmental Protection Regulations 1987

Category production or Approved Premises Category Category description design capacity production or design number capacity 05 Processing or beneficiation of metallic or 50 000 tonnes or more 3,000,000 tonnes per non-metallic ore per year annual period 06 Mine dewatering 50 000 tonnes or more 3 000 000 tonnes per per year annual period 52 Electric power generation 10MW or more in 42.21 MW aggregate (using a fuel other than natural gas) 54 Sewage Facility 100 cubic metres or 150m3 per day more per day 64 Class II or III Putrescible Landfill 20 tonnes or more per 600 tonnes per annual year 73 Bulk storage of chemicals 1000 cubic metres in 10 000m3 aggregate

Environmental Protection Act 1986 Page 1 of 32 Licence: L6498/1995/11 Amendment date: Thursday 4 August, 2016 File Number: 2012/006868 IRLB_TI0672 v2.9

Conditions This Licence is subject to the conditions set out in the attached pages.

Date signed: 4 August 2016 ...... Tim Gentle Officer delegated under section 20 of the Environmental Protection Act 1986

Environmental Protection Act 1986 Page 2 of 32 Licence: L6498/1995/11 Amendment date: Thursday 4 August, 2016 File Number: 2012/006868 IRLB_TI0672 v2.9

Contents

Licence 1 Contents 3 Introduction 3 Licence conditions 7 1 General 7 2 Emissions 12 3 Monitoring 13 4 Improvements 16 5 Information 17 Schedule 1: Maps 20 Schedule 2: Reporting & notification forms 28

Introduction

This Introduction is not part of the Licence conditions.

DER’s industry licensing role The Department of Environment Regulation (DER) is a government department for the state of Western Australia in the portfolio of the Minister for Environment. DER’s purpose is to advise on and implement strategies for a healthy environment for the benefit of all current and future Western Australians.

DER has responsibilities under Part V of the Environmental Protection Act 1986 (the Act) for the licensing of prescribed premises. Through this process DER works with the business owners, community, consultants, industry and other representatives to prevent, control and abate pollution and environmental harm to conserve and protect the environment. DER also monitors and audits compliance with works approvals and licence conditions, takes enforcement action as appropriate and develops and implements licensing and industry regulation policy.

Licence requirements This Licence is issued under Part V of the Act. Conditions contained within the Licence relate to the prevention, reduction or control of emissions and discharges to the environment and to the monitoring and reporting of them.

Where other statutory instruments impose obligations on the Premises/Licensee the intention is not to replicate them in the licence conditions. You should therefore ensure that you are aware of all your statutory obligations under the Act and any other statutory instrument. Legislation can be accessed through the State Law Publisher website using the following link: http://www.slp.wa.gov.au/legislation/statutes.nsf/default.html

For your Premises relevant statutory instruments include but are not limited to obligations under the: x Environmental Protection (Unauthorised Discharges) Regulations 2004 – these Regulations make it an offence to discharge certain materials such as contaminated stormwater into the environment other than in the circumstances set out in the Regulations. x Environmental Protection (Controlled Waste) Regulations 2004 - these Regulations place obligations on you if you produce, accept, transport or dispose of controlled waste. x Environmental Protection (Noise) Regulations 1997 – these Regulations require noise emissions from the Premises to comply with the assigned noise levels set out in the Regulations.

Environmental Protection Act 1986 Page 3 of 32 Licence: L6498/1995/11 Amendment date: Thursday 4 August, 2016 File Number: 2012/006868 IRLB_TI0672 v2.9

You must comply with your licence. Non-compliance with your licence is an offence and strict penalties exist for those who do not comply.

Licence holders are also reminded of the requirements of section 53 of the Act which places restrictions on making certain changes to prescribed premises unless the changes are in accordance with a works approval, licence, closure notice or environmental protection notice.

Licence fees If you have a licence that is issued for more than one year, you are required to pay an annual licence fee prior to the anniversary date of issue of your licence. Non payment of annual licence fees will result in your licence ceasing to have effect meaning that it will no longer be valid and you will need to apply for a new licence for your Premises.

Ministerial conditions If your Premises has been assessed under Part IV of the Act you may have had conditions imposed by the Minister for Environment. You are required to comply with any conditions imposed by the Minister.

Premises description and Licence summary

Jundee Operations (Jundee) is an operational gold mine recently acquired by Northern Star Resources from Newmont Asia Pacific. The Jundee Process Plant is currently fed with ore from three underground mines. Surface mining was suspended indefinitely in 2007, following depletion of viable surface stocks.

Jundee is located approximately 55 km north-east of the township of Wiluna and is situated on the Jundee, Lake Violet and Millrose Pastoral Leases. Land use in the Jundee area is a mixture of mining and pastoral enterprise. The major pastoral properties with a direct relationship are Barwidgee/Yandal, Millrose, Lake Violet and Jundee stations. Northern Star is the leaseholder of Jundee which continues to be sublet to Millrose Station.

Jundee comprises two historically separate operations called Jundee and Nimary. Following aggregation of the operations, the Nimary processing site was decommissioned in 2007 with final rehabilitation completed in 2010.

In 1995 a Notice of Intent was lodged with the Department of Mines for the Nimary Gold Project, on behalf of the Wiluna Joint Venture, headed by majority shareholder Eagle Mining Pty Ltd. The Nimary Gold Project comprised the Nim 1, Nim 2, Nim 3 and Nim 4 open pits.

Also in 1995, the adjacent Jundee Operations was commissioned by Great Central Mines Pty Ltd (GCM). Nimary and Jundee were immediate neighbours, separated by a tenement boundary with different owners. Two mills were constructed, one at Nimary and one at Jundee. In 1997 GCM acquired the Eagle/Nimary leases incorporating Nimary and Jundee as one operation.

In April 2000, GCM was acquired by Normandy Mining Limited (Normandy). In February 2002, Newmont Yandal Pty Ltd acquired Normandy. In July 2015 the site was acquired by Northern Star Resources. Currently the premises has a nominal rated throughput covered by the licence to process 3 000 000 tonnes of ore per annum. Processing of ore is through the Carbon in Pulp (CIP) and Carbon in Leach (CIL) process, with tailings disposal to Tailings Storage Facility (TSF) 2 and Fisher In-pit TSF. Underground mining commenced in 2007.

TSF1 was commissioned in October 1995 and was in operation until November 1999. Construction of TSF 2 commenced in February 1999 and was completed in June 1999. Deposition commenced into TSF 2 in November 1999 and this facility was used on a continuous basis until August 2004. TSF 2 has been used on a rotational basis since the commissioning of the Fisher In-pit TSF in August 2004. Fisher In-pit TSF was used continuously until October 2007. Tailings deposition is now cycled between the Fisher Pit and TSF 2 with the aim of optimising water return by depositing into the Fisher Pit in the hotter summer months to help improve water recoveries.

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The licence allows for the following activities at the Jundee Operations: x Carbon in pulp (CIP) and carbon in leach (CIL) process plant and associated infrastructure; x Tailings disposal into Tailings Storage Facilities (TSFs): TSF 2 and Fisher In-pit TSF. x A bioremediation facility which utilises treated wastewater from the sewage treatment facility and may be used for the disposal and treatment of hydrocarbon contaminated soils and oily water removed from the minesite x Decommissioned TSF 1 for the treatment of contaminated soils and materials including sewage water x Electrical power is generated on-site using six 2.2 MW gas engine generators, two 950kW gas engine generators, two 730 kW gas engine generators, one 900kW diesel engine generator and six 750 kW diesel engine generators. Additionally, three 750 kW diesel engine generators are at Nimary.

September 2015 Amendment

This Licence is the result of an amendment sought by the Licensee to alter the freeboard limit for the Fisher In-pit TSF. It also includes a transfer of ownership and a conversion to a current format licence.

August 2016 Amendment

This amendment authorises the construction of 6 gas generators and associated infrastructure as to increase the installed capacity of the power station at Jundee to 42.2 MW.

A 1.5 MW waste heat recovery unit will also be installed which captures waste heat from the new gas generators’ exhaust gases and converts it to steam, using a thermal fluid heat transfer.

Three redundant groundwater bores have also been removed from the monitoring requirement in Table 3.3.1. General conditions found to be inconsistent with DER’s Guidance Statement: Setting Conditions, October 2015 have also been removed from the Licence. The due dates for the improvement requirements under condition 4.1.1 have also been revised.

The licences and works approvals issued for the Premises since 05/02/2001 are:

Instrument log Instrument Issued Description L6498/1995/4 05/02/2001 Licence re-issue L6498/1995/5 28/12/2001 Licence re-issue L6498/1995/6 28/12/2002 Licence re-issue L6498/1995/7 28/12/2003 Licence re-issue L6498/1995/8 28/12/2003 Licence re-issue L6498/1995/9 22/11/2004 Licence re-issue L6498/1995/10 22/11/2010 Licence re-issue W5164/2012/1 25/06/2012 Works approval for Stage 6 embankment raise of 2m on TSF 2 (includes condition to develop a Groundwater Recovery and Seepage Management plan) L6498/1995/11 22/11/2013 Licence re-issue W5744/2014/1 22/12/2014 Works approval for Stage 7 embankment raise of 2m on TSF 2 L6498/1995/11 17/09/2015 Licence amendment to current format, including transfer of ownership L6498/1995/11 04/08/2016 Licence amendment to increase capacity of power station by to 42.2 MW.

Severance It is the intent of these Licence conditions that they shall operate so that, if a condition or a part of a condition is beyond the power of this Licence to impose, or is otherwise ultra vires or invalid, that condition or part of a condition shall be severed and the remainder of these conditions shall

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nevertheless be valid to the extent that they are within the power of this Licence to impose and are not otherwise ultra vires or invalid.

END OF INTRODUCTION

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Licence conditions

1 General

1.1 Interpretation

1.1.1 In the Licence, definitions from the Environmental Protection Act 1986 apply unless the contrary intention appears.

1.1.2 For the purposes of this Licence, unless the contrary intention appears:

‘Act’ means the Environmental Protection Act 1986;

‘AHD’ means the Australian height datum;

‘annual period’ means the inclusive period from 1 January until 31 December in the same year;

‘AS 4323.1’ means the Australian Standard AS4323.1 Stationary Source Emissions Method 1: Selection of sampling positions;

‘AS 4482.1’ means the Australian Standard AS4482.1 2005 Guide to the investigation and sampling of sites with potentially contaminated soil; Part 1: Non-volatile and semi-volatile compounds;

‘AS 4482.2’ means the Australian Standard AS4482.2 1999 Guide to the sampling and investigation of potentially contaminated soil; Part 2: Volatile substances;

‘AS/NZS 5667.1’ means the Australian Standard AS/NZS 5667.1 Water Quality – Sampling – Guidance of the Design of sampling programs, sampling techniques and the preservation and handling of samples;

‘AS/NZS 5667.10’ means the Australian Standard AS/NZS 5667.10 Water Quality – Sampling – Guidance on sampling of waste waters;

‘AS/NZS 5667.11’ means the Australian Standard AS/NZS 5667.11 Water Quality – Sampling – Guidance on sampling of groundwaters;

‘averaging period’ means the time over which a limit or target is measured or a monitoring result is obtained;

‘bioremediation’ means the above-ground remediation of soils to reduce the concentrations of hydrocarbons through biodegradation. The process involves the stimulation of bacteria in the soil, which consume hydrocarbons as an energy source, releasing water and carbon dioxide as the ultimate breakdown products. This may include bioaugmentation of microbes to target specific contaminants;

‘CEMS’ means continuous emissions monitoring system;

‘CEMS Code’ means the current version of the Continuous Emission Monitoring System (CEMS) Code for Stationary Source Air Emissions, Department of Environment & Conservation, Government of Western Australia;

‘CEO’ means Chief Executive Officer of the Department of Environment Regulation;

‘CEO’ for the purpose of correspondence means; Chief Executive Officer Department Administering the Environmental Protection Act 1986 Locked Bag 33

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CLOISTERS SQUARE WA 6850 Email: [email protected]

‘freeboard’ means the distance between the maximum water surface elevations and the top of retaining banks or structures at their lowest point;

‘hardstand’ means a surface with a permeability of 10-9 metres/second or less;

‘Licence’ means this Licence numbered L6498/1995/11 and issued under the Act;

‘Licensee’ means the person or organisation named as Licensee on page 1 of the Licence;

‘NATA’ means the National Association of Testing Authorities, Australia;

‘NATA accredited’ means in relation to the analysis of a sample that the laboratory is NATA accredited for the specified analysis at the time of the analysis;

‘normal operating conditions’ means any operation of a particular process (including abatement equipment) excluding start-up, shut-down and upset conditions, in relation to stack sampling or monitoring;

‘Premises’ means the area defined in the Premises Map in Schedule 1 and listed as the Premises address on page 1 of the Licence;

‘quarterly’ means the 4 inclusive periods from 1 January to 31 March, 1 April to 30 June, 1 July to 30 September, and 1 October to 31 December in the same year;

‘Schedule 1’ means Schedule 1 of this Licence unless otherwise stated;

‘Schedule 2’ means Schedule 2 of this Licence unless otherwise stated;

‘six monthly’ means the 2 inclusive periods from 1 January to 30 June and 1 July to 31 December in the same year;

‘spot sample’ means a discrete sample representative at the time and place at which the sample is taken;

‘SWL’ means Standing Water Level;

‘TSF’ means an engineered containment pond or dam used to store tailings;

‘USEPA’ means United States (of America) Environmental Protection Agency;

‘USEPA Method 2’ means United States (of America) Environmental Protection Agency Method 2 – Determination of stack gas velocity and volumetric flow;

‘USEPA Method 7E’ means United States (of America) Environmental Protection Agency Method 7E – Determination of nitrogen oxides emissions from stationary sources;

‘USEPA Method 10’ means United States (of America) Environmental Protection Agency Method 10 – Determination of carbon monoxide emissions from stationary sources;

‘μS/cm’ means microsiemens per centimetre; and

‘zone of influence’ means the area of a receiving environment with the potential to be altered or changed as a result of an emission or discharge.

1.1.3 Any reference to an Australian or other standard in the Licence means the relevant parts of the the standard in force from time to time during the term of this Licence.

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1.1.4 Any reference to a guideline or code of practice in the Licence means the version of that guideline or code of practice in force from time to time, and shall include any amendments or replacements to that guideline or code of practice made during the term of this Licence.

1.2 Premises operation

1.2.1 The Licensee shall ensure that all pipelines containing saline, alkaline or cyanide constituents are either: (a) provided with secondary containment sufficient to contain any spill for a period equal to the time between routine inspections; and/ or (b) equipped with automatic cut-outs in the event of a pipe failure; and/or (c) shall install telemetry systems and pressure sensors along pipelines carrying saline, alkaline or cyanide constituents to allow the detection of leaks and failures.

1.2.2 The Licensee shall ensure that waste material is only stored and/or treated within vessels or compounds provided with infrastructure requirements and at the locations specified in Table 1.2.1.

Table 1.2.1: Containment infrastructure Storage vessel or Material Infrastructure requirements compound TSF 2 Tailings Clay lined Fisher In-pit TSF Tailings Maintain a minimum 1 m height perimeter earthen bund surrounding the Fisher In-pit TSF. TSF 1 Tailings; Facility currently inactive except for receipt of Hydrocarbon hydrocarbon contaminated soils and sewage contaminated soils and wastewater. materials; Sewage water Nimary TSF Tailings N/A - Decommissioned Bioremediation Hydrocarbon Clay lined (or equivalent) with a permeability of 10-9 treatment cells contaminated soil m/s or less. All leachate runoff is directed to, and contained within, an impermeable leachate collection sump with capacity to contain an 1 in 100 year, 72 hour duration rainfall event. The leachate collection sump is lined in accordance with Water Quality Protection Note 27, Liners for containing pollutants, using engineered soils, June 2010 or Water Quality Protection Note 26, Liners for containing pollutants, using synthetic membranes, February 2009. Barton Level 4 Mine dewater Ingress pond located underground. No liner. Clean Water Dam Bulk diesel storage Treated water from oil HDPE liner facility (BDSF) water separator at BDSF Turkey’s Nest TSF 2 Return Water Tailings Decant Water HDPE liner Dam R2D2 Seepage Seepage groundwater HDPE liner Return Water Dam recovered near TSF2 R1D1 Seepage Seepage groundwater HDPE liner Return Water Dam recovered near TSF1 WWTP Tanks Wastewater undergoing None specified treatment Effluent Storage Wastewater None specified Ponds WWTP Sewage Sewage sludge A bunded hardstand area capable of preventing Sludge Drying Beds surface run-off of leachate and sludge

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1.2.3 The Licensee shall manage the effluent storage ponds in Table 1.2.1 in a manner such that: (a) Uncontaminated stormwater runoff resulting from roof and site drainage does not cause erosion of outer pond embankments; and (b) Vegetation (emergent or otherwise) shall be prevented from growing in the pond wastewaters or on the inner pond embankments of all ponds.  1.2.4 The Licensee shall maintain the following freeboards:

Table 1.2.2: Freeboard requirements Storage vessel or Freeboard requirements compound TSF 2 Minimum vertical freeboard of 500mm or equivalent to contain a 1 in 100 year rainfall event over 72 hours (whichever is greater) from the operational pond to lowest elevation of perimeter embankment. Fisher In-pit TSF Maintain a minimum top of embankment/ operational freeboard of 300mm.

TSF 1 Facility currently inactive. Bioremediation treatment Capacity to contain an 1 in 100 year, 72 hour duration rainfall event cells leachate collection sump TSF 2 Return Water Dam Minimum vertical freeboard of 300mm Bulk diesel storage Minimum vertical freeboard of 300mm facility (BDSF) Turkey’s Nest WWTP Tanks None specified Effluent Storage Ponds Minimum vertical freeboard of 300mm

1.2.5 The Licensee shall: (a) undertake inspections as detailed in Table 1.2.3; (b) where any inspection identifies that an appropriate level of environmental protection is not being maintained, take corrective action to mitigate adverse environmental consequences as soon as practicable; and (c) maintain a record of all inspections undertaken.

Table 1.2.3: Inspection of infrastructure Scope of inspection Type of inspection Frequency of inspection

Tailings pipelines Visual integrity Twice every 12 hours Return water lines Visual integrity Twice every 12 hours Visual to confirm required freeboard Embankment freeboard capacity is available Twice every 12 hours Borefield pipelines and pump Visual Three times per week stations Fisher In-pit TSF operating Survey Annual level/capacity

1.2.6 The Licensee shall ensure that where wastes produced on the Premises are not taken off-site for lawful use or disposal, they are managed in accordance with the requirements in Table 1.2.4.

Table 1.2.4 Management of waste Waste type Management Requirements strategy

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Sewage Biological, Maximum of 150 m3/day cumulatively physical and chemical treatment

Sewage sludge Drying and Dispose of sludge solids and other residuals in accordance storage with the Western Australian guidelines for direct land application of biosolids and biosolid products, February 2002 Hydrocarbon Bioremediation Ensure soil is bioremediated by maintaining a suitable soil contaminated waste thickness, maintaining an appropriate moisture content and nutrient level within the soil which sustains biological activity; and at least monthly soil aeration when facility is in use. Inert Waste Type 1 & 2 Receipt, All waste types No more than 600 tonnes per year of all waste types Putrescible Waste handling and disposal of cumulatively shall be disposed of by landfilling. Clean Fill waste by Disposal of waste by landfilling shall only take place within the Other waste that meets landfilling landfill areas shown on the Emission Maps in Schedule 1; the acceptance criteria Waste shall be placed in a defined trench or within an area for Class II landfills enclosed by earthen bunds; and The active tipping area shall be restricted to a maximum linear length of 30 metres. Construction, operation and decommissioning of landfill cells can occur within the defined landfill area providing there is no waste within: 100 m of any surface water body; and 3 m of the highest level of the water table aquifer. Waste shall not be burned within the trench or within the areas enclosed by earth bunds Fires within the defined trench or within the areas enclosed by earth bunds shall be extinguished as soon as practicable, upon becoming aware of the fire Waste lubricants, Disposal Collect in holding tanks for recycling and disposal off-site hydraulic fluids Waste radiator Disposal/re- Collect spent radiator coolant/inhibitors in holding tanks for coolant/inhibitors use subsequent disposal off-site or for use within the mine site for dust suppression. Note 1: Requirements for landfilling tyres are set out in Part 6 of the Environmental Protection Regulations1987.

1.2.7 The Licensee shall ensure that cover is applied and maintained on landfilled wastes in accordance with Table 1.2.5 and that sufficient stockpiles of cover are maintained on site at all times.

Table 1.2.5: Cover requirements 1 Waste Type Material Depth Timescales As soon as practicable, but at least weekly, after Putrescible waste 300mm Inert and deposit incombustible Within three months of the final waste load in each All waste material 1000mm trench Inert and Inert Waste Type 2 As soon as practical following the achievement of final incombustible 500mm (Tyres) waste levels in the area(s) where tyres are disposed of material Note 1: Additional requirements for the covering of tyres are set out in Part 6 of the Environmental Protection Regulations 1987.

1.2.8 The Licensee shall take all reasonable and practical measures to ensure that no windblown waste escapes from the landfill area and that windblown waste is collected on at least a monthly basis and returned to the active tipping area.

1.2.9 The Licensee shall construct the works to install the 6 new gas generators, waste heat recovery unit and associated infrastructure in accordance with the documentation detailed in Table 1.2.6:

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 1.2.6: Construction Requirements1 Document Parts Date of Document Zenith Pacific Pty Ltd (2016) Jundee Gold Mine, Power All 9 May 2016 Station Project , Facility Description, Document No: JU004 –DOC-001 The power station works comprise: x 6 x 11kV gas generators and auxiliaries x HV switchboard (10 tier) x 6 x Generator control panels x 415V MCC x 11kV/41V auxiliary transformer x 6 x cooling system radiators x 10 000 L lube oil tank x Gas power station building – 35m x 18m x Switch room comprising HV room/LV room and office 1.5 MW Waste heat recovery system as detailed in the file All 20 July 2016 note ‘Jundee Heat to Power Plant – Process Description’ by Jacques F.Gouws The waste heat recovery system comprises: x Exhaust collector system with a main exhaust dust that connects to each of the six generators, pressure sensors and temperature monitors x Exhaust heat exchanger module that has temperature monitoring on all streams entering and leaving the unit, whilst the thermal fluids pressure is monitored x Exhaust collector skid with a blower, valve manifold and remote control system elements x Thermal governing skid comprising control system, pumps, expansion vessel and water treatment devices x Wet steam cycle module comprising an evaporator, Lysholm expander, pump, control system x Organic rankin cycle module comprising two evaporators, Lysholm expander, pump, control system x Cooling system comprising cooling tower, pump and dosing unit. Note 1: Where the details and commitments of the documents listed in condition 1.2.9 are inconsistent with any other condition of this Licence, the conditions of this Licence shall prevail.

2 Emissions

2.1 General

2.1.1 The Licensee shall record and investigate the exceedance of any descriptive or numerical limit or target specified in any part of section 2 of this Licence.

2.2 Point source emissions to air

2.2.1 The Licensee is permitted, subject to conditions in the Licence, to emit waste to the atmosphere from the emissions points listed in Table 2.2.1 and identified in the Map of emission points, Figure 4 in Schedule 1.

Table 2.2.1: Emission points to air Emission point Emission point Emission Source including abatement reference and point height location on Figure 4 (m) A1 Gold Room Exhaust 20 Gold Room A2 Carbon Regeneration 8 Carbon Regeneration Kiln Kiln Stack

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A3 Gas Generator 10 Gas fired genset A4 Gas Generator 10 Gas fired genset A5 Gas Generator 10 Gas fired genset A6 Gas Generator 10 Gas fired genset A7 Gas Generator 10 Gas fired genset A8 Gas Generator 10 Gas fired genset A9 Gas Generator 8 Gas fired genset A10 Gas Generator 10 Gas fired genset A11 Diesel Generator 8 Diesel generator A12 Diesel Generator 8 Diesel generator A13 Diesel Generator 8 Diesel generator A14 Diesel Generator 8 Diesel generator A15 Diesel Generator 8 Diesel generator A16 Diesel Generator 8 Diesel generator A17 Gas Generator 5.2 Gas fired genset A18 Gas Generator 5.2 Gas fired genset A19 Gas Generator 7.5 Gas fired genset Jenbacher JGS 620 A20 Gas Generator 7.5 Gas fired genset Jenbacher JGS 620 A21 Gas Generator 7.5 Gas fired genset Jenbacher JGS 620 A22 Gas Generator 7.5 Gas fired genset Jenbacher JGS 620 A23 Gas Generator 7.5 Gas fired genset Jenbacher JGS 620 A24 Gas Generator 7.5 Gas fired genset Jenbacher JGS 620 A25 Exhaust heat exchanger 8 Waste heat recovery exhaust heat stack exchanger

2.3 Point source emissions to groundwater

2.3.1 The Licensee is permitted to discharge 3 000 000 tonnes of mine dewater to the main pit, location as identified in Schedule 1, Map of emission points, Figure 5 .

3 Monitoring

3.1 General monitoring

3.1.1 The licensee shall ensure that: (a) all water samples are collected and preserved in accordance with AS/NZS 5667.1; (b) all wastewater sampling is conducted in accordance with AS/NZS 5667.10; (c) all groundwater sampling is conducted in accordance with AS/NZS 5667.11; (d) all soil sampling is conducted in accordance with AS 4482.1 and AS 4482.2 as relevant; and (e) all laboratory samples are submitted to and tested by a laboratory with current NATA accreditation for the parameters being measured (unless indicated otherwise in the relevant table).

3.1.2 The Licensee shall ensure that : (a) monthly monitoring is undertaken at least 15 days apart; (b) quarterly monitoring is undertaken at least 45 days apart; (c) six monthly monitoring is undertaken at least 5 months apart; and (d) annual monitoring is undertaken at least 9 months apart.

3.1.3 The Licensee shall ensure that all monitoring equipment used on the Premises to comply with the conditions of this Licence is calibrated in accordance with the manufacturer’s specifications and the requirements of the Licence.

3.1.4 The Licensee shall, where the requirements for calibration cannot be practicably met, or a discrepancy exists in the interpretation of the requirements, bring these issues to the attention of the CEO accompanied with a report comprising details of any modifications to the methods.

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3.2 Monitoring of point source emissions to air

3.2.1 The Licensee shall undertake the monitoring in Table 3.2.1 according to the specifications in that table.

Table 3.2.1: Monitoring of point source emissions to air Emission Parameter Units1 Frequency 2 Method point reference New Gas Volumetric flow rate m3/s n/a USEPA Method 2 Gensets Oxides of nitrogen (NOx) mg/m3 Quarterly for first Modified USEPA Method 7E Carbon monoxide (CO) 12 months of Modified USEPA Method 10 operation Note 1: All units are referenced to STP dry Note 2: Monitoring shall be undertaken to reflect normal operating conditions and any limits or conditions on inputs or production.

3.2.2 The Licensee shall ensure that sampling required under Condition 3.2.1 of the Licence is undertaken at sampling locations in accordance with the AS 4323.1 or relevant part of the CEMS Code.

3.2.3 The Licensee shall ensure that all non-continuous sampling and analysis undertaken pursuant to condition 3.2.1 is undertaken by a holder of NATA accreditation for the relevant methods of sampling and analysis.

3.3 Monitoring of inputs and outputs

3.3.1 The Licensee shall undertake the monitoring in Table 3.3.1 according to the specifications in that table.

Table 3.3.1: Monitoring of inputs and outputs Input/Output Parameter Units Averaging Frequency period

Tailings Volume of tailings deposited to TSF2 m3 Monthly Cumulative deposition and Fisher In-pit TSF monthly total Volume of tailings supernatant liquor returned to process plant from TSFs Volume of seepage recovered Mine dewater Volume m3 Monthly Cumulative discharged to monthly total dam/pit Barton level 4 pH - Spot sample Quarterly Clean Dam Total dissolved solids mg/L Total recordable hydrocarbons mg/L Total phosphorus, total nitrogen mg/L Sodium, potassium, calcium, mg/L magnesium, chloride, carbonate, bicarbonate, sulfate, nitrate, fluoride, silica Aluminium, arsenic, boron, cadmium, mg/L iron, mercury, nickel, lead, zinc Main pit receiving pH - Spot sample Quarterly water body Total dissolved solids mg/L Total recoverable hydrocarbons mg/L Total phosphorus, total nitrogen mg/L Sodium, potassium, calcium, mg/L magnesium, chloride, carbonate, bicarbonate, sulfate, nitrate, fluoride, silica Aluminium, arsenic, boron, cadmium, mg/L iron, mercury, nickel, lead, zinc

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3.4 Ambient environmental quality monitoring

3.4.1 The Licensee shall undertake the monitoring in Table 3.4.1 and Table 3.4.2 according to the specifications in those tables and record and investigate results that do not meet any limit specified.

Table 3.4.1: Monitoring of ambient groundwater quality3 Monitoring point reference Parameter Limit Units Averaging Frequency and location period Jundee (TSF 1 & 2) Recovery Bores JRB01, JRB02, JRB03, JRB05, SWL1 - m(AHD) Spot Monthly JRB06, JRB07, JRB08, JRB09, sample JRB10, JRB11, JRB12, JRB13, JRB14, JRB15

Jundee (TSF 1 & 2) Seepage Indication Bores JMB17, JMB01-D, JMB04-D, SWL1 - m(AHD) Spot Quarterly JMB07-D, JMB08-D, JMB09-D, sample JMB10-S, JMB10-D, JMB14-D, JMB15-D, JMB16-D Jundee (TSF 1 & 2) Compliance Bores JMB05-S, JMB05-D, JMB06-S, SWL1 - mbgl Spot Quarterly JMB06-D, JMB23A, JMB24 sample JMB11-S, JMB11-D, JMB19, >1 JMB20 JMB12-S, JMB12-D, JMB13-S, >1 JMB13-D, JMB25, JMB26, JMB27, JMB28, JMB29 JMB05-D, JMB06-D, JMB11-D, pH2 6.0 - 9.0 - JMB12-D, JMB13-D, JMB19, Total dissolved <14 000 mg/L JMB20, JMB21, JMB22, solids2 JMB23A, JMB24, JMB25, Weak Acid <0.5 mg/L JMB26, JMB27, JMB28, JMB29 Dissociable Cyanide (WAD CN) Dissolved metals – - mg/L As, Cd, Cu, Hg, Ni, Pb, Zn Fisher In-Pit TSF Monitoring Bores FMB04, FMB05, FMB09, SWL1 - m(AHD) Spot Quarterly FMB10, FMB11 pH2 - - sample Total dissolved - mg/L solids2 Weak Acid - mg/L Dissociable Cyanide (WAD CN) Dissolved metals – - mg/L As, Cd, Cu, Hg, Ni, Pb, Zn FMB12 SWL1 - m(AHD) Spot Quarterly sample Fisher In-Pit TSF Seepage Recovery Bores FRB01, FRB04, FRB05 SWL1 - m(AHD) Spot Quarterly sample Nimary TSF Seepage Indication Bores NMB01-D, NMB02-D, NMB03-D SWL1 - m(AHD) Spot Annually sample Nimary TSF Compliance Bores NMB04-D, NMB07-D, NMB08- SWL1 - m(AHD) Spot Annually D, NMB09-D, NMB10-D, pH2 6.0 - 9.0 - sample

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NMB10-S Total dissolved <14 000 mg/L solids2 Weak Acid <0.5 mg/L Dissociable Cyanide (WAD CN) Dissolved metals – - mg/L As, Cd, Cu, Hg, Ni, Pb, Zn Bioremediation Landfarm JHMB01, JHMB02, JHMB03 TRH - mg/L Spot Annually sample Note 1: SWL shall be determined prior to collection of other water samples. Note 2: Non-NATA in field measurement of pH and TDS permitted. Note 3: A minimum of 90% of all bores listed in Table 3.3.1 will be sampled during any quarterly period to allow for maintenance and operational constraints.

Table 3.4.2: Monitoring of ambient soil quality Monitoring point Parameter Units Averaging period Frequency reference and location Landfarm TRH mg/kg Spot sample Six monthly TSF 1 TRH mg/kg Spot sample Six monthly

4 Improvements

4.1.1 The Licensee shall complete the improvements in Table 4.1.1 by the date of completion in Table 4.1.1.

Table 4.1.1: Improvement program Improvement Improvement Date of reference completion IR1 The Licensee shall, prior to commencing commissioning of gas At least two generators and waste heat recovery unit, submit a commissioning weeks prior to plan to the CEO. The commissioning plan shall include details relating commencement to: of (a) the commissioning stages and expected timescales for commissioning commissioning; (b) expected emissions and discharges during commissioning and the environmental implications of the emissions; (c) how emissions and discharges will be managed during commissioning; (d) the monitoring that will be undertaken during the commissioning period including monitoring to verify the operational performance of the new generators; (e) how accidents or malfunctions will be managed; (f) start up and shut down procedures; and (g) reporting accidents, malfunctions and proposals in the commissioning plan

Commissioning shall be carried out in accordance with the commissioning plan. IR2 The Licensee shall complete a water quality monitoring program to 01/03/16 test the concentration of selenium in mine dewater at the Barton Level 4 clean dam and in the main pit receiving water body (locations as listed in Table 3.3.1). IR3 The Licensee shall complete a water quality monitoring program to 01/03/16 test the concentration of selenium in groundwater for all Jundee Compliance bores, Nimary Compliance bores and Fisher In-Pit Monitoring Bores as listed in Table 3.4.1. IR4 The Licensee shall submit to the CEO a report detailing the results of 30/11/16 the monitoring programs as listed in IR2 and IR3. The report can be as one submission or individual submissions to address IR2 and IR3.

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5 Information

5.1 Records

5.1.1 All information and records required by the Licence shall: (a) be legible; (b) if amended, be amended in such a way that the original and subsequent amendments remain legible or are capable of retrieval; (c) except for records listed in 5.1.1(d) be retained for at least 6 years from the date the records were made or until the expiry of the Licence or any subsequent licence; and (d) for those following records, be retained until the expiry of the Licence and any subsequent licence: (i) off-site environmental effects; or (ii) matters which affect the condition of the land or waters.

5.1.2 The Licensee shall ensure that: (a) any person left in charge of the Premises is aware of the conditions of the Licence and has access at all times to the Licence or copies thereof; and (b) any person who performs tasks on the Premises is informed of all of the conditions of the Licence that relate to the tasks which that person is performing.

5.1.3 The Licensee shall complete an Annual Audit Compliance Report indicating the extent to which the Licensee has complied with the conditions of the Licence, and any previous licence issued under Part V of the Act for the Premises for the previous annual period.

5.1.4 The Licensee shall implement a complaints management system that as a minimum records the number and details of complaints received concerning the environmental impact of the activities undertaken at the Premises and any action taken in response to the complaint.

5.2 Reporting

5.2.1 The Licensee shall submit to the CEO an Annual Environmental Report by 31 March in each year, after the end of the annual period 1 January to 31 December. The report shall contain the information listed in Table 5.2.1 in the format or form specified in that table.

Table 5.2.1: Annual Environmental Report Condition or table Parameter Format or form1 (if relevant) - Summary of any failure or malfunction of any pollution control None specified equipment and any environmental incidents that have occurred during the annual period and any action taken Table 3.2.1 Stack testing results of emissions from new gas generators None specified

Table 3.3.1 Volumes of tailings deposited, supernatant liquor returned to None specified process plant and seepage water recovered. Volume of mine dewater discharge and surface water parameters Tables 3.4.1 – 3.4.2 Groundwater quality parameters None specified Soil quality sampling 5.1.3 Compliance Annual Audit Compliance Report (AACR) 5.1.4 Complaints summary None specified Note 1: Forms are in Schedule 2

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5.2.2 The Licensee shall ensure that the Annual Environmental Report also contains: (a) any relevant process, production or operational data recorded under Condition 3.1.3; and (b) an assessment of the information contained within the report against previous monitoring results and Licence limits and/or targets

5.2.3 The Licensee shall submit the information in Table 5.2.2 to the CEO according to the specifications in that table.

Table 5.2.2: Non-annual reporting requirements Condition or table Parameter Reporting Reporting date Format or form1 (if relevant) period (after end of the reporting period) - Copies of original Not Within 14 days of As received by the monitoring reports Applicable the CEOs request Licensee from third submitted to the parties Licensee by third parties Table 4.1.1 Reports as required by Not As per Table 4.1.1 Form A1 and/or IR1 and IR4. Applicable as received by the Licensee from third parties Note 1: Forms are in Schedule 2

5.2.4 The Licensee shall submit a compliance document to the CEO, following the construction of the power station upgrade works and prior to commissioning of the same.

5.2.5 The compliance document shall: (a) certify that the works were constructed in accordance with the conditions of the Licence; (b) be signed by a person authorised to represent the Licensee and contain the printed name and position of that person within the company.

5.2.6 The Licensee shall submit a commissioning report for the new gas generators, to the CEO within 3 months of the completion of commissioning.

5.2.7 The Licensee shall ensure the report includes:

(a) a summary of the monitoring results recorded under condition 4.1.1; (b) a list of any original monitoring reports submitted to the Licensee from third parties for the commissioning period; (c) a summary of the environmental performance of the gas generators as installed, against the design specification set out in the works approval application; (d) a review of performance against the works approval conditions; and (e) where they have not been met, measures proposed to meet the design specification and/or works approval conditions, together with timescales for implementing the proposed measures.

5.3 Notification

5.3.1 The Licensee shall ensure that the parameters listed in Table 5.3.1 are notified to the CEO in accordance with the notification requirements of the table.

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Table 5.3.1: Notification requirements Condition or Parameter Notification requirement Format or table form1 (if relevant) 2.1.1 Breach of any limit specified in Part A: As soon as practicable but no later N1 the Licence than 5pm of the next usual working day.

Part B: As soon as practicable

3.1.4 Calibration report As soon as practicable. None specified 3.4.1 Exceedance of the groundwater Within 21 days of becoming aware of the N1 limits specified in Table 3.4.1. results. Note 1: Forms are in Schedule 2

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Schedule 1: Maps

Premises map

Figure 1: Prescribed Premises Boundary - Jundee Operations. The Premises is shown in the map below. The pink line depicts the Premises boundary. Mining tenements inside the internal pink boundary are not part of the Prescribed Premises.

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Map of storage locations

Figure 2: Location of Jundee Operations’ containment infrastructure. The locations of the storage areas defined in Table 1.3.1 are shown below.

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Figure 3: Location of containment infrastructure at Jundee Village. (These village storages are also shown on previous Figure 2).

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Map of emission points

Figure 4: Map showing Jundee Emission Points to Air. The locations of the emission points defined in Table 2.2.1 is shown below.

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Figure 5: Mine dewater discharge point. (Barton Level 4 dam not shown as it is in the Underground Mine.) The location of the emission point in condition 2.3.1 and monitoring point for Table 3.2.1) is shown below.

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Map of monitoring locations

Figure 6: TSF1 and TSF 2 groundwater monitoring bores location, also including location of the Bioremediation Landfarm. The locations of the monitoring points defined in Tables 3.2.1 and 3.2.2 are shown below.

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Figure 7: Fisher In-pit TSF groundwater monitoring bores’ location. The locations of the monitoring points defined in Table 3.2.1 are shown below.

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Figure 8: Location of Nimary TSF groundwater monitoring bores

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Schedule 2: Reporting & notification forms

These forms are provided for the proponent to report monitoring and other data required by the Licence. They can be requested in an electronic format.

ANNUAL AUDIT COMPLIANCE REPORT PROFORMA

SECTION A LICENCE DETAILS Licence Number: Licence File Number:

Company Name: ABN:

Trading as:

Reporting period:

______to ______

STATEMENT OF COMPLIANCE WITH LICENCE CONDITIONS 1. Were all conditions of the Licence complied with within the reporting period? (please tick the appropriate box) Yes □ Please proceed to Section C No □ Please proceed to Section B

Each page must be initialled by the person(s) who signs Section C of this Annual Audit Compliance Report (AACR).

Initial:

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SECTION B DETAILS OF NON-COMPLIANCE WITH LICENCE CONDITION.

Please use a separate page for each Licence condition that was not complied with. a) Licence condition not complied with:

b) Date(s) when the non compliance occurred, if applicable:

c) Was this non compliance reported to DER?:

† Yes † Reported to DER verbally † No Date ______† Reported to DER in writing Date ______

d) Has DER taken, or finalised any action in relation to the non compliance?:

e) Summary of particulars of the non compliance, and what was the environmental impact:

f) If relevant, the precise location where the non compliance occurred (attach map or diagram):

g) Cause of non compliance:

h) Action taken, or that will be taken to mitigate any adverse effects of the non compliance:

i) Action taken or that will be taken to prevent recurrence of the non compliance:

Each page must be initialled by the person(s) who signs Section C of this AACR

Initial:

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SECTION C

SIGNATURE AND CERTIFICATION This Annual Audit Compliance Report (AACR) may only be signed by a person(s) with legal authority to sign it. The ways in which the AACR must be signed and certified, and the people who may sign the statement, are set out below. Please tick the box next to the category that describes how this AACR is being signed. If you are uncertain about who is entitled to sign or which category to tick, please contact the licensing officer for your premises.

If the licence holder The Annual Audit Compliance Report must be signed and is certified:

□ by the individual licence holder, or

An individual □ by a person approved in writing by the Chief Executive Officer of the Department of Environment Regulation to sign on the licensee's behalf.

□ by the principal executive officer of the licensee; or A firm or other unincorporated □ by a person with authority to sign on the licensee's behalf who is company approved in writing by the Chief Executive Officer of the Department of Environment Regulation.

□ by affixing the common seal of the licensee in accordance with the

Corporations Act 2001; or

□ by two directors of the licensee; or

□ by a director and a company secretary of the licensee, or

□ if the licensee is a proprietary company that has a sole director who A corporation

is also the sole company secretary – by that director, or

□ by the principal executive officer of the licensee; or

□ by a person with authority to sign on the licensee's behalf who is approved in writing by the Chief Executive Officer of the Department of Environment Regulation.

□ by the principal executive officer of the licensee; or A public authority □ by a person with authority to sign on the licensee's behalf who is (other than a local approved in writing by the Chief Executive Officer of the Department government) of Environment Regulation.

□ by the chief executive officer of the licensee; or a local government □ by affixing the seal of the local government.

It is an offence under section 112 of the Environmental Protection Act 1986 for a person to give information on this form that to their knowledge is false or misleading in a material particular. There is a maximum penalty of $50,000 for an individual or body corporate. I/We declare that the information in this annual audit compliance report is correct and not false or misleading in a material particular.

SIGNATURE: ______SIGNATURE: ______NAME: NAME: (printed) ______(printed) ______POSITION: ______POSITION: ______

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DATE: ______/______/______DATE: ______/______/______

SEAL (if signing under seal)

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Licence: L6498/1995/11 Licensee: Northern Star Resources Ltd Form: N1 Date of breach:

Notification of detection of the breach of a limit.

These pages outline the information that the operator must provide. Units of measurement used in information supplied under Part A and B requirements shall be appropriate to the circumstances of the emission. Where appropriate, a comparison should be made of actual emissions and authorised emission limits.

Part A Licence Number Name of operator Location of Premises Time and date of the detection

Notification requirements for the breach of a limit Emission point reference/ source Parameter(s) Limit Measured value Date and time of monitoring Measures taken, or intended to be taken, to stop the emission

Part B Any more accurate information on the matters for notification under Part A. Measures taken, or intended to be taken, to prevent a recurrence of the incident. Measures taken, or intended to be taken, to rectify, limit or prevent any pollution of the environment which has been or may be caused by the emission. The dates of any previous N1 notifications for the Premises in the preceding 24 months.

Name Post Signature on behalf of Northern Star Resources Ltd Date

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Decision Document

Environmental Protection Act 1986, Part V

Proponent: Northern Star Resources Ltd

Licence: L6498/1995/11

Registered office: Level 1 388 Hay St SUBIACO WA 6008

ACN: 092 832 892

Premises address: Jundee Operations SHIRE OF WILUNA WILUNA WA 6646 Mining tenements: G53/20, L53/52, L53/60, L53/68 - L53/73, L53/75, L53/99, L53/100, L53/102, L53/112, L53/113, L53/117, L53/136 - L53/138, L53/142, L53/143, L53/153, L53/169, L53/174, M53/155, M53/156, M53/182, M53/191, M53/192, M53/196 - M53/199, M53/221, M53/226, M53/228 - M53/230, M53/235 - M53/237, M53/245 - M53/250, M53/326, M53/347, M53/372, M53/412 - M53/414, M53/441, M53/446, M53/451, M53/452, M53/461, M53/477 - M53/480, M53/492, M53/535 - M53/541, M53/552, M53/588, M53/589, M53/611, M53/707, M53/708, M53/711, M53/712, M53/836, M53/874, M53/895, M53/911, M53/929, M53/935, M53/940, M53/966, PL34.

Issue date: Thursday, 21 November 2013

Commencement date: Friday, 22 November 2013

Expiry date: Thursday, 21 November 2024

Decision

Based on the assessment detailed in this document the Department of Environment Regulation (DER), has decided to issue an amended licence. DER considers that in reaching this decision, it has taken into account all relevant considerations and legal requirements and that the Licence and its conditions will ensure that an appropriate level of environmental protection is provided.

Decision Document prepared by: Louise Lavery Licensing Officer

Decision Document authorised by: Tim Gentle Delegated Officer

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Contents

Decision Document 1 Contents 2 1 Purpose of this Document 2 2 Administrative summary 2 3 Executive summary of proposal and assessment 3 4 Decision table 6 5 Advertisement and consultation table 13 6 Risk Assessment 14 Appendix A 15 Appendix B 18

1 Purpose of this Document

This decision document explains how DER has assessed and determined the application and provides a record of DER’s decision-making process and how relevant factors have been taken into account. Stakeholders should note that this document is limited to DER’s assessment and decision making under Part V of the Environmental Protection Act 1986. Other approvals may be required for the proposal, and it is the proponent’s responsibility to ensure they have all relevant approvals for their Premises.

2 Administrative summary

Administrative details

Works Approval Application type New Licence Licence amendment Works Approval amendment Category Assessed design capacity number(s) Activities that cause the premises to become 5 3 000 000 tonnes per annual period prescribed premises 6 3 000 000 tonnes per annual period 52 42.21 MW 54 150m3 per day 64 600 tonnes per annual period 73 10 000m3 Application verified Date: 27/6/16 Application fee paid Date: N/A Yes No N/A Works Approval has been complied with Compliance Certificate received Yes No N/A Commercial-in-confidence claim Yes No

Commercial-in-confidence claim outcome

Is the proposal a Major Resource Project? Yes No

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Was the proposal referred to the Environmental Referral decision No: Protection Authority (EPA) under Part IV of the Yes No Managed under Part V Environmental Protection Act 1986? Assessed under Part IV Ministerial statement No: Is the proposal subject to Ministerial Conditions? Yes No EPA Report No:

Does the proposal involve a discharge of waste Yes No into a designated area (as defined in section 57 of the Environmental Protection Act 1986)? Department of Water consulted Yes No

Is the Premises within an Environmental Protection Policy (EPP) Area Yes No If Yes include details of which EPP(s) here.

Is the Premises subject to any EPP requirements? Yes No

If Yes, include details here, eg Site is subject to SO2 requirements of Kwinana EPP.

3 Executive summary of proposal and assessment

Jundee Operations (Jundee) is an operational gold mine recently acquired by Northern Star Resources from Newmont Asia Pacific. The Jundee Process Plant is currently fed with ore from three underground mines. Surface mining was suspended indefinitely in 2007, following depletion of viable surface stocks.

Jundee is located approximately 55 km north-east of the township of Wiluna and is situated on the Jundee, Lake Violet and Millrose Pastoral Leases. Land use in the Jundee area is a mixture of mining and pastoral enterprise. The major pastoral properties with a direct relationship are Barwidgee/Yandal, Millrose, Lake Violet and Jundee stations. Northern Star is the leaseholder of Jundee which continues to be sublet to Millrose Station.

Jundee comprises two historically separate operations called Jundee and Nimary. Following aggregation of the operations, the Nimary processing site was decommissioned in 2007 with final rehabilitation completed in 2010.

In 1995 a Notice of Intent was lodged with the Department of Mines for the Nimary Gold Project, on behalf of the Wiluna Joint Venture, headed by majority shareholder Eagle Mining Pty Ltd. The Nimary Gold Project comprised the Nim 1, Nim 2, Nim 3 and Nim 4 open pits.

Also in 1995, the adjacent Jundee Operations was commissioned by Great Central Mines Pty Ltd (GCM). Nimary and Jundee were immediate neighbours, separated by a tenement boundary with different owners. Two mills were constructed, one at Nimary and one at Jundee. In 1997 GCM acquired the Eagle/Nimary leases incorporating Nimary and Jundee as one operation.

In April 2000, GCM was acquired by Normandy Mining Limited (Normandy). In February 2002, Newmont Yandal Pty Ltd acquired Normandy. In July 2015 the site was acquired by Northern Star Resources. Currently the premises has a nominal rated throughput covered by the licence to process 3 000 000 tonnes of ore per annum. Processing of ore is through the Carbon in Pulp (CIP) and

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Carbon in Leach (CIL) process, with tailings disposal to Tailings Storage Facilities (TSF) 2 and Fisher In-pit TSF. Underground mining commenced in 2007.

TSF1 was commissioned in October 1995 and was used until November 1999. Construction of TSF 2 commenced in February 1999 and was completed in June 1999. Deposition commenced into TSF 2 in November 1999 and this facility was used on a continuous basis until August 2004. TSF 2 has been used on a rotational basis since the commissioning of the Fisher In-pit TSF in August 2004. Fisher Pit was used continuously until October 2007. Tailings deposition is currently cycled between the Fisher Pit and TSF 2 with the aim of optimising water return by depositing into the Fisher Pit in the hotter summer months to help improve water recoveries.

The licence allows for the following activities at the Jundee Operations: x Carbon in pulp (CIP) and carbon in leach (CIL) process plant and associated infrastructure; x Tailings disposal into Tailings Storage Facilities (TSFs): TSF 2 and Fisher In-pit TSF; x A bioremediation facility which utilises treated wastewater from the sewage treatment facility and may be used for the disposal and treatment of hydrocarbon contaminated soils and oily water removed from the minesite; x Decommissioned TSF 1 for the treatment of contaminated soils and materials including sewage water; and x Electrical power is generated on-site using six 2.2 MW gas engine generators, two 950kW gas engine generators, two 730 kW gas engine generators, one 900kW diesel engine generator and six 750 kW diesel engine generators. Additionally, three 750 kW diesel engine generators at Nimary.

September 2015 Amendment

This Licence was the result of an amendment sought by the Licensee to alter the freeboard limit for the Fisher In-pit TSF. It also includes a transfer of ownership and a conversion to a current format licence.

August 2016 Amendment

This amendment authorises the construction of 6 gas generators, a waste heat recovery unit and associated infrastructure as to increase the capacity of the power station to a total installed capacity of 42.2MW.

The new power station will comprise of the following major equipment: x 6 x 11kV gas generators and auxiliaries x 1 x HV Switchboard (10 tier) x 6 x Generator Control Panels x 1 x 415V MCC x 1 x 11kV/415V Auxiliary Transformer x 6 x Cooling System Radiators x 1 x 10,000L Lube oil tank x 1 x Gas Power Station Building – 35m x 18m x 1 x Switch Room comprising HV Room / LV Room and Office

The waste heat recovery unit comprises: x Exhaust collector system x Exhaust heat exchanger module

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x Exhaust collector skid x Thermal governing skid x Wet steam cycle module x Organic Rankin cycle module x Cooling system

Three redundant groundwater bores have also been removed from the monitoring requirement in Table 3.3.1. General conditions found to be inconsistent with DER’s Guidance Statement: Setting Conditions, October 2015 have also been removed from the Licence. The due dates for the improvement requirements under condition 4.1.1 have also been revised.

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4 Decision table

All applications are assessed in line with the Environmental Protection Act 1986, the Environmental Protection Regulations 1987, and DER’s Operational Procedure on Assessing Emissions and Discharges from Prescribed Premises. Where other references have been used in making the decision they are detailed in the decision document.

DECISION TABLE Works Approval Condition number Justification (including risk description & decision methodology where Reference documents / Licence section W = Works Approval relevant) L= Licence General Previous licence August 2016 Amendment General provisions of the conditions conditions L1.2.1 - Environmental Protection L1.2.3 These conditions have been removed from the licence in accordance with the Act 1986. Guidance Statement: Setting Conditions as these general conditions are considered not enforceable. DER (2015) Guidance Statement: Setting Conditions, October 2015 Premises L1.2.1 September 2015 Amendment General provisions of the operation L1.2.5 Environmental Protection Normal operation Act 1986 Emission Description Emission: Spill of saline water, process slurry or tailings slurry or liquor from pipelines. Tailings pipelines transfer tailings to the TSFs and tailings return lines transfer decant water back (tailings liquor) back to the process plant. Borefield pipelines transfer saline water from the water borefield to the processing plant.

Impact: A spill of saline water, process slurry or tailings outside of bunding may impact on surrounding vegetation dependent on location. The spill may also result in localised soil contamination.

Controls: All overland pipelines containing either tailings, saline water, or tailings decant water are bunded and regularly inspected. Records are kept of inspections.

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DECISION TABLE Works Approval Condition number Justification (including risk description & decision methodology where Reference documents / Licence section W = Works Approval relevant) L= Licence

Risk Assessment Consequence: Minor Likelihood: Unlikely Risk Rating: Moderate

Regulatory Controls L1.2.1 was added to the Licence to ensure that the systems are in place to isolate pipelines transferring materials with saline, alkaline or cyanide constituents, and that these systems are implemented and maintained, and/or that pipelines containing these constituents have bunding capacity sufficient to contain spills. This condition replaces conditions W4(a) and W4(b) on the previous licence.

L1.2.5 details that tailings pipelines, return water pipelines and borefield pipelines require scheduled inspections. L1.2.5 in part replaces previous licence conditions W6, W7(a), W7(b) and W7(c).

Residual Risk Assessment Consequence: Minor Likelihood: Unlikely Risk Rating: Moderate L1.2.2 September 2015 Amendment

Containment infrastructure requirements are detailed in condition L1.2.2.

DER’s assessment and decision making in relation to the TSFs’ operation including provision of freeboards and related ambient groundwater quality monitoring, is detailed in Appendix A. L1.2.3 September 2015 Amendment L1.2.4

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DECISION TABLE Works Approval Condition number Justification (including risk description & decision methodology where Reference documents / Licence section W = Works Approval relevant) L= Licence Condition L1.2.3 replaces condition W14 on the previous licence and has not been reassessed. Freeboard requirements for the effluent storage ponds in condition L1.2.4 address points (ii) and (iii) of previous licence condition W14. In 2012 the western embankment of the village effluent ponds was raised to ensure the ponds held capacity for a 1/100 year, 72 hour duration storm event. L1.2.6 September 2015 Amendment General provisions of the Environmental Protection Condition L1.2.6 details requirements for management of waste. It replaces Act 1986. previous licence conditions W10(b), W10(d), W10(e), W15, S1(a), S2(c), S2(d), S2(e) and has not been reassessed. L1.2.7, L1.2.8 September 2015 Amendment General provisions of the Environmental Protection Conditions L1.2.7 and L1.2.8 replace conditions S1(b), S2(a) and S2(b) on Act 1986. the previous licence and have not been reassessed.

L1.2.9 August 2016 Amendment General provisions of the Construction - – New Gas Generators and Waste Heat Recovery Unit Environmental Protection Act 1986. Refer to Appendix B for DER’s assessment and decision making for new construction works to install additional power station capacity, waste heat recovery unit and associated infrastructure.

Point source L1.2.9, L2.2.1 August 2016 Amendment Ambient Air Assessment emissions to air L3.2.1 – L3.2.3 Construction and Operations – New Gas Generators Criteria, National including Environmental Protection monitoring Refer to Appendix B for DER’s assessment and decision making. Measure (Ambient Air

Quality) Normal Operation – Existing Power Generation NSW Protection of the Emission Description Environment Operations Emission: Combustion gases (NOx, SOx and particulates) from diesel and

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DECISION TABLE Works Approval Condition number Justification (including risk description & decision methodology where Reference documents / Licence section W = Works Approval relevant) L= Licence gas generators released to air via emission points A3 – A18 (refer Table (Clean Air) Regulation 2.2.1). 2010, Schedule 4 Impact: Reduced local air quality. The nearest sensitive receptor is 20 km away. Controls: Efficient low NOx burners are proposed to prevent the generation of NOx. Maintenance procedures are in place to optimise the combustion process.

Risk Assessment Consequence: Insignificant Likelihood: Unlikely Risk Rating: Low

Regulatory Controls The generators are an efficient design. L1.2.3 requires the equipment including emissions control measures to be maintained on a regular basis. No monitoring is prescribed.

Residual Risk Consequence: Insignificant Likelihood: Unlikely Residual Risk Rating: Low L2.2.1, L4.1.1 September 2015 Amendment NSW Protection of the Environment Operations Two emission points to air (A1 and A2) have been identified as part of this (Clean Air) Regulation amendment and added to the Licence. Further information was requested as 2010, Schedule 3 per IR1 of Table 4.1.1, condition L4.1.1, to assist in determining the significance of these emissions. Pending this information, the requirement for monitoring can be assessed.

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DECISION TABLE Works Approval Condition number Justification (including risk description & decision methodology where Reference documents / Licence section W = Works Approval relevant) L= Licence August 2016 Amendment

IR1 (for air emission background information) was completed and hence the requirement under L4.1.1 has been removed from the Licence. Point source L2.3.1, L3.2.1 September 2015 Amendment General provisions of the emissions to Environmental Protection groundwater Condition L2.3.1 authorises discharge of mine dewater to the main pit Act 1986. including consistent with the volume limit for category 6. Monitoring condition L3.2.1 monitoring requires the volume and quality of this discharge to be monitored and replaces previous licence condition W13(a). Monitoring L3.1.1 – L3.1.5 September 2015 Amendment General provisions of the general Environmental Protection Monitoring conditions L3.1.1- L3.1.5 have been included on the Licence as Act 1986. monitoring of inputs and outputs and ambient groundwater quality are included on the Licence. These conditions replace previous licence conditions W11(b), W11(c) and part of W16(a). Monitoring of L3.3.1 September 2015 Amendment General provisions of the inputs and Environmental Protection outputs Condition L3.3.1 in part replaces previous licence conditions W13(a) and Act 1986. W13(b) (refer also to point source emissions to groundwater section above.). L3.2.1 also adds requirements to monitor tailings deposition, tailings return water and seepage recovery volumes and volume of mine dewater discharged. Ambient L3.4.1 September 2015 Amendment Table A1, Appendix A of environmental Schedule B5a – Guideline quality DER’s assessment and decision making in relation to the TSFs’ operation on Ecological Risk monitoring including ambient groundwater quality monitoring, is detailed in Appendix A. Assessment, Assessment of Site Contamination Groundwater and soil monitoring to assess the performance of the NEPM bioremediation landfarm and the TSF 1 has been included in the licence in condition L3.3.1 and replaces the previous licence conditions W11(a) in part Saprolite Environmental

Environmental Protection Act 1986 Page 10 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

DECISION TABLE Works Approval Condition number Justification (including risk description & decision methodology where Reference documents / Licence section W = Works Approval relevant) L= Licence and W16(a). (2015) Annual Environmental Report to On the basis of data from the 2014 AER and 2015 AER, the requirement to the Department of monitor lead levels in soil has been removed from the licence as the lead Regulation; Licence concentrations are well below the ecological investigation level (EIL) for fresh No.6498/1995/11 1 January or aged contamination for areas of ecological significance (this being the to 31 December 2014, highest level of protection – refer Table A1 of Schedule B5a of the March 2015 Assessment of Site Contamination NEPM). The EIL level is 110 mg/kg for lead, whilst 2014 Jundee data ranged from 7 – 22 mg/kg and 2015 data 7 – Saprolite Environmental 12mg/kg. (2014) Annual Environmental Report to Similarly as no BTEX (benzene, toluene, ethyl benzene or xylene) or lead in the Department of groundwater was recorded above the level of detection and minimal levels of Regulation; Licence nitrogen and phosphorus in groundwater were detected, these parameters No.6498/1995/11 1 January have been removed from Table 3.2.1. BTEX was not recorded above the to 31 December 2013, level of detection in the soil samples so has also been removed from Table March 2014 3.2.2. Monitoring total recoverable hydrocarbons in soil and groundwater is sufficient to assess if the bioremediation areas are performing adequately.

August 2016 Amendment

Administrative corrections were made to the list of Fisher In-pit TSF monitoring bores to be sampled to remove redundant bores FMB06, FMB07 and FMB08. Note 3 was reinstated for Table 3.4.1 to specify that 90% of all bores must be sampled during the quarter. Improvements L4.1.1 September 2015 Amendment Licensee supplied information Tasks IR2, 3, 4 of Table 4.1.1 relate to including monitoring of selenium as part of the metal analytical suite for ambient groundwater quality. Selenium NSW Protection of the has the potential to be biomagnified within food webs through uptake by Environment Operations plants or soil fauna, and so it is important to limit the discharge of this (Clean Air) Regulation element into shallow soils to reduce risks of environmental harm taking place. 2010, Schedule 3

Environmental Protection Act 1986 Page 11 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

DECISION TABLE Works Approval Condition number Justification (including risk description & decision methodology where Reference documents / Licence section W = Works Approval relevant) L= Licence The risk of selenium entering local food webs locally is minimal provided the perched water table is maintained at depths greater than about 1 metre below ANZECC (2000) Water the ground surface. Selenium is associated with saline groundwater in the Quality Guidelines for fresh goldfields, hence the inclusion of investigatory monitoring of this parameter. and marine water quality, Section 3 Aquatic August 2016 Amendment ecosystems.

A new IR1 has been added to the improvement table 4.1.1 for the Licensee to develop and submit to the CEO a commissioning plan for the new power station, prior to commissioning.

Following a request by the Licensee dated 25 May 2016, DER has extended Letter from Garry Mills, the due date for IR 4 to 30 November 2016. Northern Star Resources to DER, 25 May 2016 Information L5.1.1 – 5.1.4 September 2015 Amendment General provisions of the L5.2.1 - 5.2.3 Environmental Protection Conditions relating to the management of records and complaints, notification Act 1986. requirements and the submission of an annual audit compliance report and annual environmental report are included in the Licence. These replace previous licence conditions G2 (a), G2 (b), G2 (c) and G3. L5.3.1 September 2015 Amendment

Condition L5.3.1 replaces previous licence conditions G1(a), G1 (b) and G1(c). Licence Duration N/A August 2016 Amendment DER (2016) Amendment by Notice, 29 April 2016 An extension to the licence expiry date was made by separate amendment notice on 29 April 2016.

Environmental Protection Act 1986 Page 12 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

5 Advertisement and consultation table

Date Event Comments received/Notes How comments were taken into consideration 13/08/2015 Proponent sent a copy of draft Corrections to tenements, capacities for Comments adopted into the Licence and instrument category 6 and 73 provided, confirmation of Decision Document where appropriate. infrastructure listed in Table 1.3.1 and edit to timeframe for submission of IR1 under Licence condition 4.1.1. 05/07/2016 Licensee sent a copy of draft Additional proposal to include assessment Assessment of waste heat recovery unit instrument and approval of a 1.5MW waste heat included in decision document and licence. recovery unit to capture heat from exhaust gases of the new gas generators.

Environmental Protection Act 1986 Page 13 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

6 Risk Assessment Note: This matrix is taken from the DER Corporate Policy Statement No. 07 - Operational Risk Management

Table 1: Emissions Risk Matrix

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Appendix A

Premises operation including ambient groundwater monitoring

Emission Risk Assessment – Operations Emission Description Emission: Seepage of tailings liquor from TSF 2 and the Fisher In-Pit TSF into groundwater raising the standing water levels of groundwater and altering groundwater quality surrounding the TSF.

Impact: Tailings seepage containing heavy metals, cyanide and elevated salinity as compared to background levels (Background TDS of 1000mg/L to 2000mg/L with seepage being in excess of 10000 mg/L) resulting in an alteration of groundwater quality. Groundwater mounding due to seepage also has the potential to impact adjacent vegetation through inundation of vegetation root systems.

Controls: Jundee Operations operates a network of seepage recovery bores (refer to Table 3.4.1 of the Licence) to reduce groundwater mounding attributable to TSF 2 and to the Fisher In-pit TSF. Nimary TSF is decommissioned and tailings deposition to TSF 1 is currently not occurring.

Jundee has also prescribed internal performance targets and triggers with associated management actions to increase seepage recovery in response to monitoring data, if required as part of their Groundwater Recovery Seepage Management Plan (see also Regulatory Controls below).

Risk Assessment Consequence: Moderate Likelihood: Possible Risk Rating: Moderate

Regulatory Controls A monitoring program for ambient groundwater depth and quality surrounding TSF 1 and TSF 2, Fisher In-pit TSF and decommissioned Nimary TSF is required by Licence condition L3.4.1.

Works approval W5164/2012/1 for the stage 6 embankment raise required Jundee Operations to develop a Groundwater Recovery Seepage Management Plan (GRSMP) to manage seepage associated with TSF 2 operations. The GRSMP, dated August 2013, was submitted to DER in 2013. The objective of this plan is to prevent impact to vegetation from rising groundwater levels. A vegetation survey conducted as part of the GRSMP has ascertained that the root profile of the locally dominant species Acacia aneura and Acacia pruinocarpa did not extend beyond the first metre below ground level. Hence a standing water level (SWL) limit of 1m bgl has been placed on the Licence as part of condition L3.4.1.

Groundwater quality limits for pH, total dissolved solids (TDS) and weak acid dissociable cyanide concentration are also included in Table 3.4.1 of condition 3.4.1. If a result is recorded in excess of the limits notification requirements to DER are included in Licence condition 5.3.1.

It should be noted that over the life of L6498/1995/11 the TDS limit has been gradually increased in response to increasing salinity of the groundwater surrounding the TSFs, however the limit of TDS of 14,000 mg/L is unchanged from the existing Licence. The groundwater quality limits have been included on the Fisher In-Pit TSF monitoring bores.

Residual Risk Consequence: Moderate Likelihood: Unlikely

Environmental Protection Act 1986 Page 15 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

Risk Rating: Moderate

References

ANZECC (2000) Water Quality Guidelines for fresh and marine water quality, Section 3 Aquatic ecosystems.

Newmont Jundee Operations (2013) Groundwater Recovery Seepage Management Plan, August 2013.

Emission Risk Assessment – Emergency Operation Emission Description Emission: Release of supernatant liquors or tailings from Fisher In-pit TSF from overtopping during high rainfall event.

Impact: Tailings solids and liquors containing heavy metals and cyanide released to land. Localised soil contamination and potential to impact adjacent vegetation and fauna.

Controls: An engineering assessment of the freeboard requirements for Fisher In-Pit TSF was conducted (Coffey 2014). This included a survey of the tailings beach levels and existing capacity. The freeboard required for a 1 in 100 year, 72 hour duration storm event was calculated (250mm). The engineering assessment concluded that a 300 mm freeboard for the TSF was low risk of overtopping, providing the earth bund surrounded the TSF is maintained to a height of at least one metre (section 6, Coffey 2014).

The one metre perimeter containment bund surrounds the Fisher In-pit TSF to prevent stormwater ingress from adjacent areas and to also provide emergency storm containment.

Daily visual inspections of freeboard are conducted.

Risk Assessment Consequence: Moderate Likelihood: Unlikely Risk Rating: Moderate

Regulatory Controls

Licence condition L1.2.2 requires that the containment bund surrounding Fisher In-pit TSF is maintained to a height of at least one metre.

The requirement to maintain a total freeboard of 300 mm is included on the Licence as part of condition L1.2.4.

Condition L1.2.5 requires daily visual inspections to confirm freeboard capacity is available. A requirement to complete an annual survey of the operating level/capacity of the Fisher In-pit TSF has also been included in Table 1.2.3, condition L1.2.5.

Residual Risk Assessment Consequence: Moderate Likelihood: Unlikely Risk Rating: Moderate

Environmental Protection Act 1986 Page 16 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

References Australian National Committee on Large Dams (ANCOLD) (2012) Guidelines on Tailings Dams: Planning, Design, Construction, Operation and Closure, May 2012.

Coffey (2014) Northern Star Resources Jundee Gold Operations Fisher Pit TSF Freeboard Assessment Report, 23 October 2014.

Environmental Protection Act 1986 Page 17 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

Appendix B

Point source emissions to air including monitoring

Power Generation

The emissions to air from point sources at Jundee Operations has altered with the proposal to install 6 x 3MW gas generators and one 1.5MW waste heat recovery unit. The installation of the additional gas generation may allow for decommissioning of existing diesel generators, resulting in a further reduction in overall emissions from the current operation. The Licensee intends not to operate the 18MW in its entirety, rather install the additional capacity to provide for greater redundancy capacity (Northern Star Resources 2016). It is also the Licensee’s intent to decommission some diesel generators following installation and commissioning of the new power station

NOx emissions from the diesel generators are typically an order of magnitude larger than gas (in the range of 5000 – 8000 mg/m3).

The new gas generators are an efficient design. Expected NOx emissions are equal to, or less than 500 mg/m3 for each (Zenith Pacific 2016).

Abnormal Operation

Emission Description Emission: Combustion gases (NOx, CO, CO2, CH4) in excess of design criteria from gas generators via waste heat recovery stack or individual stacks. The gas generators are able to operate in open (vent from individual unit) or closed cycle (vent via common exhaust via waste heat recovery heat exchanger). Refer to Figure 9 following for further detail of the process flow.

Impact: Reduced local air quality. The design criterion for NOx emissions from the new gas generators is estimated at equal to, or less than 500mg/Nm3 (Zenith Pacific 2016). In the absence of any Western Australian criteria, Schedule 4 of the NSW Protection of the Environment Operations (Clean Air) Regulations has been used as a reference. The emission concentration limit for NOx emissions from new stationary combustion engines in NSW is 450mg/m3.

There are no adjacent receptors. The nearest population is at the accommodation camp for the mine which is located 5 km away from the power station. The nearest sensitive receptor is Wiluna, 50 km south-west from the Premises.

Controls: No specific emissions abatement is proposed. Regular maintenance will be conducted to ensure the generators are operating as per design.

Risk Assessment Consequence: Insignificant, the nearest sensitive receptor is 50 km away Likelihood: Unlikely, maintenance procedures are in place Risk Rating: Low

Regulatory Controls Quarterly emissions monitoring by stack testing has been imposed to validate emissions and maintenance of the combustion process for the first twelve months of operation for the new generators. Following results that indicate that the operation of the generators is well managed, the requirement for monitoring will be removed from the Licence as per the requirements for the existing gas generators. The monitoring requirements are detailed in condition L3.2.1.

Environmental Protection Act 1986 Page 18 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

Residual Risk Consequence: Insignificant Likelihood: Unlikely Residual Risk Rating: Low

References

Northern Star Resources (2016) Licence Amendment Application L6498/1995/11, 27 May 2016

Schedule 4 of NSW Protection of the Environment Operations (Clean Air) Regulations 2010

Zenith Pacific Pty Ltd (2016) Jundee Gold Mine, 18MW Power Station Project, Facility Description, Document No: JU004 –DOC-001, 9 May 2016

Environmental Protection Act 1986 Page 19 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

Figure 9: Waste Heat Recovery Process flow diagram showing location of exhaust inputs from gas generators and final exhaust point to air

Environmental Protection Act 1986 Page 20 of 20 Decision Document: L6498/1995/11 Amendment date: Thursday,4 August 2016 File Number: 2012/006868 IRLB_TI0669 v2.7

Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations

APPENDIX D

Jundee Plant Description

SAPROLITE ENVIRONMENTAL

JUNDEE PLANT DESCRIPTION

1.0 INTRODUCTION

2.0 PROCESS FLOWS 2.1 Crushing and Fine Ore Storage

3.0 MILLING 3.1 Grinding Circuit 3.2 Pebble Crusher 3.3 Cyclone Classification 3.4 Gravity Circuit 3.5 Trash Removal

4.0 LEACHING AND ADSORPTION 4.1 Leaching 4.2 Adsorption

5.0 TAILINGS DISPOSAL

6.0 GOLD RECOVERY 6.1 Desorption Procedures 6.2 Electrowinning and Smelting 6.3 Carbon Regeneration

7.0 WATER SUPPLIES 7.1 Raw Water Supply 7.2 Process Water Supply 7.3 Potable Water Supply

8.0 COMPRESSED AIR PRODUCTION

9.0 REAGENTS

10.0 EXPLANATION OF TERMINOLOGY

NORTHERN STAR RESOURCES LIMITED JUNDEE PLANT DESCRIPTION

1.0 INTRODUCTION

The Jundee Gold Treatment Plant was designed and constructed by Minproc Engineers for Great Central Mines NL. The plant was commissioned during December 1995 and the first day of milling was 15 December. The first dore bar, JGM 1, weighing 450 oz was poured on 27 December 1995. In the first full year of operation 2.7 Mt of ore was processed.

The plant is a conventional CIP gold treatment plant designed to treat 2 MTPA of oxide ore. The plant throughput is related to the different ore types processed.

2.0 CRUSHING AND FINE ORE STORAGE

Mined ore is delivered to the "Run of Mine" (ROM) stockpile by truck. The ore is stockpiled in "fingers" according to grade and ore type. The ore is reclaimed from the fingers and fed to a 150 tonne ROM Bin by Komatsu 600 front-end loader. The bin is fitted with a fixed grizzly to remove oversize rocks and water sprays are fitted to the rim of the bin for suppression of dust. The ore is drawn from the bin by an apron feeder (FE-01) and passes across a static grizzly which removes fines before the primary crusher. The oversize passes into the primary crusher, CR-01.

The primary crusher is a Nordberg C125 (950 mm x 1250 mm) single toggle jaw crusher driven by a 150 kW motor. The normal closed size setting of the crusher is 100 mm. Primary crushed ore and grizzly undersize drop onto the primary crusher product conveyor, CV-01, and then via a transfer chute onto the stockpile feed conveyor, CV-02, which discharges onto the crushed ore stockpile. A weightometer is provided on CV-01 to record crusher throughput.

DCE Volkes dust collectors are provided on CV-01 beside the primary crusher and at the CV-01/02 transfer chute. The collected dust is discharged back onto the conveyors.

The total capacity of the stockpile is approximately 25,000 tonnes and the theoretical live capacity is 4,500 tonne. Crushed ore is removed from the bottom of the stockpile by three belt feeders FE-02, FE-03, and FE- 04. An emergency reclaim hopper and emergency belt feeder FE-05 is available for use by the loader if the main feeders are not available. The feeders are under automatic control and discharge onto the mill feed conveyor CV-03.

3.0 MILLING

3.1 Grinding Circuit

The mill feed conveyor is fitted with a Ramsey Weightometer. The ore feed rate to the mill is controlled by varying the speed of the feeders. The weightometer is calibrated on a quarterly basis.

A lime silo is installed above the mill feed conveyor and hydrated lime is fed from the silo onto the conveyor through a rotary vane feeder. The lime addition rate is controlled by varying the speed of the rotary vane. A pH probe is installed in the leach feed launder into Leach Tank 1. The lime addition rate is controlled automatically according to pH.

The Sag Mill, ML-01, is a 5.49 m diameter by 8.7 m long ANI grate discharge mill. It is driven by a 3.85 MW Teco wound rotor motor through a gearbox which is direct coupled to the mill pinion. The mill rotates at a speed of 13.56 RPM (75 % of critical speed). The mill is steel lined and charged with grinding balls of a maximum size of 125 mm. Water is added to the mill feed chute and to the mill discharge hopper. Ground ore and water (slurry) is discharged from the mill and screened through the mill trommel. Undersized pulp (minus 22 mm) flows through the mill trommel to the mill discharge hopper whilst oversize material (mill scats) is accelerated through the mill trommel by a forward helix before being crushed and returned to the grinding circuit.

The mill is operated in closed circuit with hydrocyclone classifiers (cyclones).

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NORTHERN STAR RESOURCES LIMITED JUNDEE PLANT DESCRIPTION

3.2 Pebble Crushing Circuit

The pebble crusher is a Metso/Nordberg, HP100 cone crusher driven by a 90kW motor and operating with a closed side set (CSS) of 15 mm. Pebbles are crushed in batches, to maximise the pebble crushers’ efficiency by crushing in choke feed conditions. Pebble crushing is initiated automatically when the surge bin level reaches 80% full and stops when the surge bin level has reduced to 10% full. Crushed pebbles discharge onto the pebble crusher discharge conveyor, 02-CV-05 and then into the emergency feed bin, 02- BN-02. Crushed pebbles are recovered from the emergency feed bin by a variable speed feeder, 02-FE-05 and discharged onto the mill feed conveyor, 02-CV-03. The emergency feeder’s speed is controlled (via the DCS) to match the pebble production rate from the SAG mill.

3.3 Cyclone Classification

There is 1 cyclone circuit consisting of 2 Warman 12/10 cyclone feed pumps, one duty pump and one stand- by, both fitted with variable speed drives feeding a cluster of 23 cyclones. The cluster includes thirteen CAVEX 250 mm diameter and ten Warman 250 mm diameter cyclones. The number of cyclones in operation is varied according to milling conditions. The cyclones are used to separate ore particles which have been ground sufficiently from ore particles which require further grinding. The cyclone underflow stream containing the coarse particles gravitates to the ball mill feed chute and the cyclone overflow containing the fine particles gravitates to the trash screen. The aim particle size in the cyclone overflow is 80 % or more by weight smaller than 106 microns (0.106 mm). This grind target may be altered depending on the ore type. The cyclone overflow slurry constitutes the leach feed.

3.4 Gravity Circuit

A portion of the cyclone underflow is split off and directed to the gravity circuit. The cyclone underflow split is screened over a sieve bend and the undersize is fed to a 30 inch Centre Discharge Knelson Concentrator. The Knelson is a centrifugal concentrator which collects coarse gold particles by virtue of high speed rotation of the collection bowl and water injection through fine jets in the bowl. The concentrator is a batch unit, which operates under automatic control. At preset time intervals the feed is turned off, the Knelson bowl is slowed down and then back flushed with water to wash the gold concentrate into a storage tank. The unit then returns to normal operation.

The Knelson concentrate is emptied from the storage tank each day and upgraded on a Wilfley Table. The high grade concentrate from the Wilfley Table is taken to the gold room for drying, weighing and smelting.

The Knelson Concentrator, storage hopper and Wilfley Table are located inside a secure meshed area and a small control panel is provided for remote operation of the concentrator.

3.5 Trash Removal

Removal of trash from the leach feed stream is accomplished by passing the slurry over a Malco 1800/4800 vibrating screen fitted with a polyurethane screen cloth with a slotted aperture of 0.75 mm x 25 mm. The screened slurry flows into Leach Tank No 1. Oversize trash falls from the screen to a trash hopper and is collected and dumped.

4.0 LEACHING & ADSORPTION

A small control room is located above the gravity circuit. The grinding, leaching, and adsorption sections of the process are monitored and controlled from this room.

4.1 Leaching

Ground slurry gravitates from the trash screen to two leach tanks in series. The pulp flows continuously from one leach tank to the next to allow sufficient time for the optimum amount of gold to be extracted. Each tank is 13 m diameter x 13.25 m high with an equivalent live volume of 1700 m3 and is fitted with a Lightnin dual open impeller type agitator mechanism. The function of the leaching section is to provide sufficient time to dissolve the gold in the ore prior to the adsorption stage.

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NORTHERN STAR RESOURCES LIMITED JUNDEE PLANT DESCRIPTION

The two main reagents used in the leaching section are lime and sodium cyanide solution. Lime is added to the ore stream on the ball mill feed belt from a 450 tonne lime silo by a variable speed rotary vane feeder. Sodium cyanide solution is added to the first leach tank.

The lime is used to provide an alkaline environment to protect the cyanide from decomposition. (Cyanide decomposes in an acid environment to liberate toxic hydrogen cyanide gas). The alkalinity or pH is controlled in the range of pH 10.5 - 11.0 by altering the lime addition rate to the mill feed.

The cyanide is added to leach (dissolve) gold contained in the pulp and is controlled in the range of 150 – 200 ppm sodium cyanide. The pH and sodium cyanide target levels may be altered from time to time depending on the type of ore treated.

Leaching starts in the leach tanks and may continue in the adsorption tanks. Under normal circumstances leaching is completed before the pulp exits the last adsorption tank.

4.2 Adsorption

Pulp from the final leach tank passes to the adsorption section. The adsorption section consists of 6 tanks in series. Each tank is 13 m diameter x 13.25 m high with an equivalent live volume of 1700 m3 and is fitted with a Lightnin dual open impeller type agitator mechanism and two cylindrical woven wire interstage screens. Each tank contains granulated carbon and the purpose of the interstage screens is to allow passage of the pulp to the next tank while retaining the carbon. The interstage screens are fitted with 1.0 mm aperture woven wire mesh and are equipped with a mechanical wiper mechanism to clear the carbon granules from the face of the screens and prevent blocking the screen cloth apertures.

The carbon granules are used to adsorb dissolved gold from the pulp in the tanks – ie. the gold dissolved by the cyanide transfers to the carbon granules. The carbon is moved by airlifting from the last adsorption tank (ADS6) to the first adsorption tank (ADS1) whilst the pulp flows by gravity from the first tank to the last – ie. the carbon and pulp are moved counter currently. The carbon in the first adsorption tank contains the most gold while the carbon in the last adsorption tank contains the least.

Loaded carbon is pumped by a Galigher recessed impeller vertical sump pump from the first adsorption tank to the carbon recovery screen which is fitted with an 0.8 mm aperture woven wire screen. Water sprays on the screen clean the carbon before it discharges into the elution circuit acid wash column. The screened slurry returns to the first adsorption tank.

Eluted or stripped carbon is returned to the last adsorption tank. The carbon granules gradually break up. The fine carbon is removed from the circuit after the Regeneration Kiln. New carbon is added to the circuit periodically.

The pulp passes out of the last tank to the tails safety screen. At this point, all of the cyanide soluble gold should have been dissolved from the ore particles and all of the gold in solution should have been adsorbed onto the carbon. The tails screen is a Malco 1800/4800 vibrating screen fitted with a polyurethane cloth with slotted aperture of 0.80 mm x 25 mm. The screen is used to collect any carbon that has exited the last tank (ADS6) due to a hole in the intertank screen or from a poor seal around the base of the screen. The carbon collected off the tails safety screen is returned to the CIP circuit.

The plant has been designed for a carbon concentration of 5 g/l per tank. Carbon advance is conducted each day to provide adequate levels of carbon in the first adsorption tank (ADS1) to allow filling of the acid column.

5.0 TAILINGS DISPOSAL

The underflow from the tails screens passes to the Tails Hopper and is pumped to the tailings storage facility. The tails pumps are Warman 10/8 pumps fitted with variable speed drives.

The tailings lines run around the wall of the tailings dam and spigot discharge is utilised to facilitate an even distribution of slurry into the dam.

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NORTHERN STAR RESOURCES LIMITED JUNDEE PLANT DESCRIPTION

6.0 GOLD RECOVERY

The gold recovery circuit has been designed to operate as a single elution per day/seven day per week basis. The actual elution frequency is governed by the leach feed grade and carbon loadings.

A 5 tonne batch of carbon can be processed within a 12 hour period. The procedure is based on the Split Anglo-American Research Laboratories (AARL) system in which the carbon, loaded with gold, is acid washed, then eluted using hot caustic cyanide solution at 125oC. The design uses two columns, one for acid washing and the other for caustic-cyanide desorption.

The gold bearing eluate produced from the desorption process is circulated through electrowinning cells where the gold is electroplated onto steel wool. The barren solution at the end of the cycle is then returned to the first leach tank or used for cyanide mixing.

The gold laden steel wool is removed from the electrowinning cells, oxidised in a calcining oven and smelted directly with fluxes in a gas-fired furnace. The gold slag melt is poured into bullion moulds.

The electrowinning, calcination and smelting processes are performed inside a secure gold room which is protected with electronic door locks, an electronic alarm system and a closed circuit TV system.

6.1 Desorption

The loaded carbon removed from the first adsorption tank for acid washing in a rubber-lined column. Acid washing of the carbon is required to remove acid soluble substances, particularly calcium and magnesium precipitates, which interfere with the desorption process. The acid wash is carried out at ambient temperature, where acid is injected for 20 minutes using a 3 – 4 % strength hydrochloric acid solution, and soaked for a further 30 minutes. The spent acid is discharged to the tailings hopper.

A water wash cycle is used to remove residual hydrochloric acid from the carbon before treatment with caustic and cyanide. This is an essential step as contacting of acid and cyanide is hazardous. All wash solutions are discharged to the tailings hopper. On completion of the water wash, carbon is hydraulically transferred to the elution column.

A gas fired oil heater is used to heat the desorption solution (eluate) to a temperature of approximately 125oC via the primary heat exchanger. Caustic and cyanide solutions are injected into the elution column as the eluate is pumped through the column. The eluate desorbs gold from the carbon and passes from the column through a reclaim heat exchanger which is also used to raise the temperature of the fresh solution. The gold solution is collected in the eluate tank. The desorption process is normally completed within 8 hours.

A cooling cycle is necessary to prevent boiling of water in the column when removing the carbon and to rinse any caustic and cyanide solution from the carbon prior to regeneration. The cooling and rinse water are discharged to the lean eluate tank and used for the next elution.

The barren carbon is hydraulically transferred from the elution column, either to the regeneration kiln or the CIP circuit.

6.2 Electrowinning and Smelting

Electrowinning is used to remove gold from the electrolyte solution and is carried out after desorption. The gold is deposited onto steel wool cathodes.

The electrolyte solution (loaded with gold) from the elution column is pumped through one of two rectangular electrowinning cells of 12 cathode capacity. The electrowinning cells are arranged in parallel and the spent electrolyte overflows from the cells into the return eluate tank and is pumped back to the elution tank.

Each cathode consists of about 0.5 kg of steelwool and a gold loading of between 2 – 4 kg per cathode can be expected. The cathodes are removed according to the gold loadings.

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NORTHERN STAR RESOURCES LIMITED JUNDEE PLANT DESCRIPTION

The cathodes are calcined overnight in an oven at 750qC. The dried residue is then mixed with fluxes and smelted directly in a gas-fired furnace. Gold is poured into bullion moulds and the slag is returned to the mill to recover any residual metals.

6.3 Carbon Regeneration

The purpose of regeneration is to reactivate carbon and also to remove organic compounds such as oils that adsorb onto the carbon during pulp and carbon contact. The reactivation is necessary as loss of activity of the carbon can result in loss of gold from the plant in solution form. It is important that no organic chemicals or mineral oils (lubricating oils) are allowed to contaminate the plant circuit as the carbon activity can be completely destroyed by these fouling agents.

Eluted carbon is transferred hydraulically to the kiln feed vessel and the water allowed to drain. The vertical kiln is heated by a gas burner to a temperature of 600qC. The drained carbon is fed at a rate up to 150 kg/h into the kiln, where the carbon is regenerated at 600qC for 15 minutes. The regenerated carbon is then fed by vibrating feeder into a Carbogen cleaning unit. This unit removes fine carbon and sand particles from the carbon. The screened regenerated carbon then reports to the carbon transfer vessel.

The regenerated carbon is transferred hydraulically from the transfer vessel to the last adsorption circuit.

7.0 WATER SUPPLIES

Water for plant is obtained from the following sources:

7.1 Raw Water Supply

Raw water is obtained from a borefield and from mine dewatering pumps.

Seven bores are operated on the Sandhill Wells Borefield for a nominal design output of 8,500 kL/day. The bores discharge to a main line which delivers the water to the raw water tank at the plant site. An overflow on the raw water tank allows excess water to flow to the process water dam.

A centrifugal pump mounted at the raw water tank transfers water to the plant for use in the gravity circuit, gland water pumps and dust suppression.

7.2. Process Water Supply

Process water is a mix of tails return water, raw water and pit dewatering.

The solid material in the tailings slurry settles in the tailings storage facility and the clear solution is reclaimed via a central decant tower. A pump is used at the decant tower to transfer the solution to the process water dam.

A number of bores are located in the nearby open pit mining area to recover ground water and rainwater run- off. This water is delivered to the process water dam at the plant site.

7.2 Potable Water Supply

Two additional bores are used to supply fresh water to the village and the plant site.

The fresh water for the plant site is pumped by the plant bore to the fresh water tank. The majority of this water is pumped through a cationic softener to the transfer water tank for use in the elution circuit. The remainder of the water is pumped through an anionic purifier for nitrate removal, chlorinated and stored in the potable water tank. The potable water is piped around the site to safety showers, ablutions, cribrooms and drinking fountains.

The fresh water for the village is supplied by specific bores. This water is used for reticulation of the gardens and is also chlorinated and reticulated around the village for general purpose use. A proportion is purified using a Reverse Osmosis plant to remove nitrates for human consumption at the designated water fountains, the kitchen and the village ice machines.

P:\N NSR\N01 Jundee\Site Data\Mill Process\Jundee Plant Description 2003-09-Final (NSR).doc Last printed 28/03/2017 11:40:00 AM

NORTHERN STAR RESOURCES LIMITED JUNDEE PLANT DESCRIPTION

8.0 COMPRESSED AIR PRODUCTION

Two compressors are used to meet the plant’s compressed air requirements.

Compressed air is used for: x High Pressure Instrument Air - For the air operated valves on the elution circuit and the milling area. x High Pressure Plant Air - Service points within the plant and workshop. x Low Pressure Air - For operation of the carbon transfer airlifts.

9.0 REAGENTS

Lime (calcium oxide, CaO) is stored in a bulk silo over the mill feed belt. Lime is fed from the silo directly onto the mill feed belt for pH control within the leach circuit.

Liquid Caustic (caustic soda, sodium hydroxide, NaOH) is delivered by bulk tanker. Its concentration is 53 % NaOH for use in the elution circuit.

Sodium Cyanide is supplied as a bulk liquid of 32 % strength and stored in two vertical storage tanks inside a locked compound adjacent to the cyanide mixing facility.

Cyanide solution (sodium cyanide, NaCN) is prepared at the cyanide mixing facility by diluting bulk liquid to the required strength by the addition of barren eluate. Metered pumps are used to pump the solution into the plant.

Concentrated Hydrochloric Acid - (Spirits Of Salts, 35 % HCl) is supplied by bulk tanker. It is used for acid washing of carbon prior to elution. Acid delivered in drums is used in the laboratory.

Concentrated Nitric Acid - (45 % HNO3) is supplied in 20 litre drums. It is used in diluted form for acid cleaning of plate heat exchanger plates in the stripping plant, acid cleaning of vibrating screen cloths, acid reduction of gravity concentrates and cleaning of gold bars. It is also used in the laboratory.

Millsperse 830 is added to the process water and tails return lines to control scale, which would otherwise build-up in pipelines to, from and around the plant. It is supplied in 1000 litre bulkiboxes.

10.0 EXPLANATION OF TERMINOLOGY

Ore - a mixture of minerals which can be mined and treated at a profit to extract a saleable metal or mineral (ie. gold)

Overburden - a mixture of minerals of no commercial value which must be mined to allow mining of ore.

ROM - run of mine - broken rock as it is removed from the mine.

Slurry or Pulp - the mixture obtained when broken ore materials and water are mixed.

CIL - carbon in leach - a gold extraction circuit using granulated carbon added to the slurry in which the leaching process and adsorption process take place simultaneously. All tanks contain carbon.

CIP - carbon in pulp - a gold extraction circuit using granulated carbon in which the leaching process takes place prior to the adsorption process. For example, no carbon is present in the slurry during the leaching stage.

Tailings or Tails - either wet or dry pulp after processing through a mineral treatment plant. For example, the valuable metal or mineral has been removed leaving only waste materials.

Cyclone or Hydrocyclone - a device used to separate fine and coarse materials within a slurry.

Classification - The process of separation of fine particles from coarse particle - ie. by use of a cyclone or a screen.

Leaching - removal of desired materials from a mixture of solids by treatment with a solution which will dissolve the desired materials.

Potable Water - water fit for human consumption.

Non-Potable Water – not recommended for human consumption.

P:\N NSR\N01 Jundee\Site Data\Mill Process\Jundee Plant Description 2003-09-Final (NSR).doc Last printed 28/03/2017 11:40:00 AM Annual Environmental Report to the DWER, Licence No 6498/1995/11 – 1 January to 31 December 2017 Jundee Operations

APPENDIX E

Bore Hydrographs

SAPROLITE ENVIRONMENTAL 250 575 Wiluna Rainfall FRB01

200 550

150 525

100 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

50 475

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17

300

FRB01 Production

Conversion to a Recovery Bore in 250 December 2005, recorded as 'Dry' in Dec 2007

200

150

100 Monthly Production (KL) Production Monthly

50

0 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G059 FRB01 (FMB1)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E1 A4 250 575 Wiluna Rainfall FRB05/02 (FMB2A/2)

200 550

Conversion to Recovery Bore in December 2005. Bore collapse in 2008. Replaced by FRB05 in 2009. 150 525

100 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

50 475

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17

6,000

FRB05/02 (FMB2A/2) Production

5,000

4,000

3,000

2,000 Monthly Production (KL) Production Monthly

1,000

0 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G060 FRB05 (FMB2A)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E2 A4 250 575 Wiluna Rainfall FRB03/FRB04 (FMB3/FMB3A)

200 550 Conversion to a Recovery Bore in December 2005, casing collapse early 2007, replaced with FMB3A in Sept 2007.

150 525

100 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

50 475

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17

6,000

FRB03/FRB04 (FMB3/FMB3A) Production

5,000

4,000

3,000

2,000 Monthly Production (KL) Production Monthly

1,000

0 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G061 FRB04 (FMB3A)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E3 A4 10 FMB04 Field pH 9 DER Criteria pH (Min) DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB04 Lab TDS (Field TDS Mar15 and from Sep15) 15000 DER Criteria TDS (max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

2.0 FMB04 WADCN

1.5 DER Criteria WADCN (Max)

1.0

WADCN WADCN (mg/L) 0.5

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB04 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G062 FMB04

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E4 A4 10 FMB05 Field pH 9 DER Criteria pH (Min) DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB05 Lab TDS 15000 DER Criteria TDS (max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 FMB05 WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB05 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G0101 FMB05

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E5 A4 10 FMB06 Field pH 9 DER Criteria pH (Min) DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB06 Lab TDS 15000 DER Criteria TDS (Max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 FMB06 WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB06 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G0104 FMB06

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E6 A4 10 FMB07 Field pH 9 DER Criteria pH (Min) DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB07 Lab TDS 15000 DER Criteria TDS (Max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 FMB07 WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB07 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G0102 FMB07

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E7 A4 10 FMB08 Field pH 9 DER Criteria pH (Min) DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB08 Lab TDS 15000 DER Criteria TDS (Max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 FMB08 WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB08 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G0103 FMB08

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E8 A4 10 FMB09 Field pH 9 DER Criteria pH (Min) DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB09 Lab TDS 15000 DER Criteria TDS (Max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 FMB09 WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB09 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G095 FMB09 (JFP3)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E9 A4 10

9

8

pH FMB10 Field pH 7 DER Criteria pH (Min) DER Criteria pH (Max) 6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB10 Lab TDS 15000 DER Criteria TDS (Max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 FMB10 WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB10 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G096 FMB10 (JFP4)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E10 A4 10 FMB11 Field pH 9 DER Criteria pH (Min) DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 FMB11 Lab TDS 15000 DER Criteria TDS (Max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 FMB11 WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 575 Wiluna Rainfall 200 FMB11 550

150 525

100 500

50 475 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 450 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G097 FMB11 (JFP10)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E11 A4 220 560 Wiluna Rainfall FMB12 (JFE10)

200 550

180 540

160 530

140 520

120 510

100 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

80 490

60 480

40 470

20 460

0 450 Dec-07 Dec-08 Dec-09 Dec-10 Dec-11 Dec-12 Dec-13 Dec-14 Dec-15 Dec-16 Dec-17

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Fisher IPTSF

PROJECT: JUNDEE OPERATIONS DWG NO: G098 FMB12 (JFE10)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E12 A4 10 JMB05-D Field pH DER Criteria pH (Min) 9 DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 JMB05-D Lab TDS 15000 DER Criteria TDS (max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 JMB05-D WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 600 Wiluna Rainfall JMB05-D 200 575 JMB05-S

150 550

100 525

50 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 475 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17 * DER Criteria relate to Compliance Bores only

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Jundee TSF

PROJECT: JUNDEE OPERATIONS DWG NO: G015 JMB05 - D, -S

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E13 A4 10 JMB06-D Field pH DER Criteria pH (Min) 9 DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 JMB06-D Lab TDS 15000 DER Criteria TDS (max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 JMB06-D WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 600 Wiluna Rainfall 200 JMB06-D 575

150 550

100 525

50 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 475 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Jundee TSF

PROJECT: JUNDEE OPERATIONS DWG NO: G016 JMB06 - D

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E14 A4 10 JMB11-D Field pH DER Criteria pH (Min) 9 DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 JMB11-D Lab TDS 15000 DER Criteria TDS (max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 JMB11-D WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 600 Wiluna Rainfall JMB11-D 200 575 JMB11-S

150 550

100 525

50 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 475 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Jundee TSF

PROJECT: JUNDEE OPERATIONS DWG NO: G063 JMB11-D,-S (Compliance)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E15 A4 10 JMB12-D Field pH DER Criteria pH (Min) 9 DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 JMB12-D Lab TDS 15000 DER Criteria TDS (max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 JMB12-D WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 600 Wiluna Rainfall JMB12-D 200 575 JMB12-S

150 550

100 525

50 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 475 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Jundee TSF

PROJECT: JUNDEE OPERATIONS DWG NO: G064 JMB12-D,-S (Compliance)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E16 A4 10 JMB13-D Field pH DER Criteria pH (Min) 9 DER Criteria pH (Max)

8 pH 7

6

5 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

18000 JMB13-D Lab TDS 15000 DER Criteria TDS (max) 12000

9000

6000

Salinity TDS) (mg/L Salinity 3000

0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

0.6 JMB13-D WADCN 0.5 DER Criteria WADCN (Max) 0.4

0.3

0.2 WADCN WADCN (mg/L) 0.1

0.0 Dec-07 Jul-08 Dec-08 Jul-09 Dec-09 Jul-10 Dec-10 Jul-11 Dec-11 Jul-12 Dec-12 Jul-13 Dec-13 Jul-14 Dec-14 Jul-15 Dec-15 Jul-16 Dec-16 Jul-17 Dec-17

250 600 Wiluna Rainfall JMB13-D 200 575 JMB13-S

150 550

100 525

50 500 Water Level (mAHD) Level Water Monthly Rainfall (mm) Rainfall Monthly

0 475 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09 Jun-10 Dec-10 Jun-11 Dec-11 Jun-12 Dec-12 Jun-13 Dec-13 Jun-14 Dec-14 Jun-15 Dec-15 Jun-16 Dec-16 Jun-17 Dec-17

CLIENT: NORTHERN STAR RESOURCES LIMITED PROJECT: N0100 TITLE: Jundee TSF

PROJECT: JUNDEE OPERATIONS DWG NO: G065 JMB13-D,-S (Compliance)

Annual Environmental Report DATE: 16-Mar-18 FIGURE: E17 A4