Jundee Gold Mine For personal use only 1. Jundee Mine and Geology Overview August 2015 Disclaimer Competent Persons Statements The information in this announcement that relates to exploration results, data quality, geological interpretations and Mineral Resource estimations for the Company’s Jundee Project is based on information compiled by Brook Ekers and fairly represents this information. Mr Ekers is a Member of the Australian Institute of Geoscientists and a full-time employee of Northern Star Resources Limited who has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the "Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves“. Mr Ekers consents to the inclusion in this announcement of the matters based on this information in the form and context in which it appears. The information in this announcement that relates to Ore Reserve estimations for the Company’s Jundee Project is based on information compiled by Jeff Brown and fairly represents this information. Mr Brown is a Member of the Australian Institute of Mining and Metallurgy who is a full-time employee of Northern Star Resources Limited and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the "Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves". Mr Brown consents to the inclusion in this announcement of the matters based on this information in the form and context in which it appears. Forward Looking Statements Northern Star Resources Limited has prepared this announcement based on information available to it. No representation or warranty, express or implied, is made as to the fairness, accuracy, completeness or correctness of the information, opinions and conclusions contained in this announcement. To the maximum extent permitted by law, none of Northern Star Resources Limited, its directors, employees or agents, advisers, nor any other person accepts any liability, including, without limitation, any liability arising from fault or negligence on the part of any of them or any other person, for any loss arising from the use of this announcement or its contents or otherwise arising in connection with it. This announcement is not an offer, invitation, solicitation or other recommendation with respect to the subscription for, purchase or sale of any security, and neither this announcement nor anything in it shall form the basis of any contract or commitment whatsoever. This announcement may contain forward looking statements that are subject to risk factors associated with gold exploration, mining and production businesses. It is believed that the expectations reflected in these statements are reasonable but they may be affected by a variety of variables and changes in underlying assumptions which For personal use only could cause actual results or trends to differ materially, including but not limited to price fluctuations, actual demand, currency fluctuations, drilling and production results, reserve estimations, loss of market, industry competition, environmental risks, physical risks, legislative, fiscal and regulatory changes, economic and financial market conditions in various countries and regions, political risks, project delay or advancement, approvals and cost estimates. 2 Jundee Operation Overview . Location : Western Australia - 50km Northeast of the town of Wiluna and 970km Northeast of Perth . Mining History: First production from Open pits commenced in 1995 - transitioning into an underground-only operation by Sept 2007 delivering a total combined mill production of 41.8M tonnes with an average head grade of 5.1gpt and a 94% recovery for 6.4M fine ounces of gold poured to end June2015. Mineral Resource (incl. of Reserve) (30 June 20151): 1.4Moz Au (11.9Mt at 3.5g/t) . Mineral Reserve (30 June 20151): 596Koz Au (3.5Mt at 5.3g/t) . Current operations: Mechanised underground operations from 3 separate portals ( Invicta, Barton, Gateway) - ore is accessed and extracted through declines and ore drives - with top-down long-hole open stoping being the main mining method. The current underground operation supplies ~ 1.2Mtpa ore to the mill. Mill & Capacity: Jundee Mill – SAG/BM configuration - CIP - 1.3 Mtpa hard rock capacity/ 1.7Mtpa oxide capacity . Power: A 12MW gas fired power station connected to the Gold Fields Gas Pipeline via privately owned spur pipeline and an 9MW backup diesel fired power station . Access: Private airport as well as local roads that are connected to a major highway . Accommodation : Village has rooms for 600+ staff . Outstanding Growth Potential: 4 Key Underground in-mine resource areas of focus with potential to significantly increase the LOM – Wilson Gap, Moneyline/Midas/Nexus, Gateway HW and In-Mine material (Barton, Invicta and Westside). Open Pit Opportunity: Current studies being conducted on 410koz open pit resource for supplementary oxide feed options over and above current U/G hard rock feed . Aggressive exploration of in/near mine mineralisation: Extensional deep-hole project identified high potential targets For personal use only below and south of current mining area. A$17M, 2.4km long drill drive under construction . Aggressive Regional exploration : Extensive tenement holdings with highly prospective and relatively untested regional targets a focus in 2015. 3 1 Refer ASX Announcement released 4 August 2015 titled: Northern star grows mine lives significantly with 2.7Moz Increase in resources to 8.9Moz. History, Exploration and Discovery Jundee - Nimary Goldfield 1978-1983 Chevron explores for base metals 1983-1989 M. Creasy finds gold nuggets 1989 Nimary tenements dropped Nimary 1989-1990 Hunter Resources - lag anomaly 36,400 ounces 1991-1992 No further work 1993-1995 Eagle Mining farm-in 747,000 ounces 1995 Open Pit Mining begins Aug’95 Jundee 1989 - 1992 M. Creasy - LAG & RAB drilling 1991 GCM-Creasy JV Agreement 1993-1995 1,300,000 ounces from eight deposits 1995 First Open Pit ore Milled Dec 1995 1997 First UG ore produced Dec 1997 1997 GCM takes over Eagle and Wiluna Mining 1998 1 Moz gold produced 2000 Normandy Mining takeover 2001 Westside discovered 2002 Newmont Mining 2007 Nimary Mill and Camp shut down 2013 6 Moz gold produced 2014 Northern Star purchase Jundee Current Production ( 9mnth ave) For personal use only 99% Underground fresh rock <1% Surface oxide 135,000 Milled tonnes/mth 5.7 g/t Average grade 4 Jundee Mine and Infrastructure Cook Keating • Underground Operations Reid – 3 Operational Portals (Barton, Invicta, and Gateway) with a total of 203km of underground development done since commencing of UG operations in Aug 1997. Northwest Nim 1&2 – Multiple, narrow vein mineralised lodes (>1000 modelled) – Current Max Depth below surface - Stoping 700m, Development Menzies 770m, Centroid of Mining 550m below surface – Top down cascading LHOS mining method TSF 2 – 5 x Primary Exhaust Vent Fans – UG Magazines, Fuel stations, Pump Stations Nim 6 Deakin Barton Byrnecut & Swick Workshops • Surface Operations (The Golden Triangle) Jundee ROM – Multiple Open Pits - Suspended Nov 07 Nim 3 & Crusher – Haulage completed Jun 08, milling completed Aug 08 Jundee Mill Jundee Office • Milling Operations – Jundee Mill – SABC configuration - CIP - 1.3Mtpa hard rock Fisher capacity Nim 4 Powerhouse – Nimary Mill decommissioned Main & Lab Kestrel – Tailings – in-pit tailings (Fisher) and paddock deposition on TSF2 Wiluna Rd • Supporting Infrastructure – 2 x Powerhouse – 21MW capacity (Gas 12MW, Diesel 9MW) – Water Supply – 2 bore fields – 14 km from operations – Accommodation Village ( 600+ capacity) - 4km – Gravel Airstrip For personal use only Jundee Airstrip Rd • Landholdings – 64 Tenements covering 420 km2 over a strike-length of 45kms in Jundee Camp Rd the Yandal Greenstone belt – Head lease holder of 1 pastoral station covering 8,200 km² 5 Jundee Operation Overview Consistent Historical Operational Statistics Jundee Historic Production and Financial results NST Production and Financial results Callender Years 2010 2011 2012 2013 2014 FY2015 Jundee Ore Mined Mt 1.0 0.9 1.1 1.1 1.3 Jundee Ore Mined Mt 1.3 Jundee Ore Grade gpt 10.9 13.2 8.7 6.6 6.7 Jundee Ore Grade gpt 5.9 Jundee Mined Ounces OZ 362,000 372,000 303,000 243,000 275,000 Jundee Mined Ounces OZ 237,883 Mill Processed Tonnes Mt 1.6 1.3 1.5 1.6 1.4 Mill Processed Tonnes Mt 1.3 Mill Processed Grade gpt 7.2 8.1 7.3 5.6 5.8 Mill Processed Grade gpt 5.8 Mill Recovery % 95 95 94 94 93 Mill Recovery % 93 Mill Gold Produced OZ 348,000 326,000 327,000 275,000 250,000 Mill Gold Produced OZ 222,850 Free Cash Flow USD ‘000 $199,776 $308,412 $297,729 $160,195 N/A Free Cash Flow A$ $114,355 For personal use only Total CAS/Gold Sold USD/Oz $442 $538 $672 $738 N/A Total Gold Sold OZ 223,727oz Total Cost/GEO USD/Oz $533 $659 $778 $848 N/A All in Sustaining Cost A$ $1,008/oz 6 Jundee Reserve & Resource History & Update – June 2015 Focused Exploration Delivering Consistent Growth Jundee Reserves incl. Stockpiles and GIC Release (M tonnes) g/t (Koz) Dec-13 3 4.3 411 NMT Jun-14 2.5 4.8 383 NST Dec-14 2.8 4.6 415 NST Jun-15 3.5 5.3 596 NST Jundee Resource (inclusive of Reserve) Release (M tonnes) g/t (Koz) Dec-13 3.6 4.4 506 NMT Jun-14 Tot 4.2 6.4 851 NST Dec-14 UG 4.5 6.1 877 Normal UG + Stockpiles (48Koz) Dec-14 O/P 4.7 1.8 271 New O/P (Cook, DDragon, Gourdis, Mensies) Dec-14 Tot 9.2 3.9 1,148 Total Jundee UG & Surface Resource as on 31Dec-14 Jun -15 UG 4.4 6.7 941 Underground material and valued stockpiles (38Koz) Jun-15 O/P 7.6 1.7 408 Open pit material (Newly added Vause) Jun- 15 Tot 11.9 3.5 1,349 Total Jundee UG & Surface Resource as on 30 June-15 Jundee Gold Production and Replacement Jul14-Jun15 1.