Project Martha

OCEANAGOLD PROJECT MARTHA Applications for Resource Consents and Assessment of Environmental Effects 25 May 2018 TABLE OF CONTENTS Part 1: Application for Resource Consent Part 2: Assessment of Environmental Effects 1. Introduction __________________________________________________________ 1 1.1 Overview of the Proposal 1 1.2 OceanaGold New Zealand Limited 4 1.3 Resource Consent Requirements 4 1.4 Report Structure 5 2. Existing Environment __________________________________________________ 6 2.1 Introduction 6 2.2 Land Use and Zoning 6 2.3 Land Ownership 8 2.4 Socio-Economic Context 8 2.5 Cultural Values 10 2.6 Existing and Authorised Mining Activities 12 2.7 Landscape Context and Character 27 2.8 Transport network 28 2.9 Noise 34 2.10 Vibration 36 2.11 Hydrogeology 38 2.12 Surface Water 41 2.13 Terrestrial Ecology 46 2.14 Heritage Values 46 2.15 Significant Trees 47 2.16 Air Quality, Meteorology and Climate 48 3. Project Description ___________________________________________________ 51 3.1 Introduction 51 3.2 Martha Underground Mine 52 3.3 Phase 4 Cutback 63 3.4 Tailings Storage and Rock Disposal 70 3.5 Project Schedule 72 3.6 Workforce 73 4. Resource Consent Requirements ________________________________________ 74 4.1 Hauraki District Council 74 4.2 Waikato Regional Council 80 5. Assessment of Effects _________________________________________________ 91 5.1 Introduction 91 5.2 Permitted Baseline 92 5.3 Economic Effects 92 5.4 Landscape, Visual Amenity and Natural Character 94 5.5 Geotechnical Matters and Structural Integrity 99 5.6 Geochemistry and Acid Rock Drainage 103 5.7 GroundWater and Settlement 104 5.8 The Pit Lake 112 Project Martha – Assessment of Environmental Effects 5.9 Noise 120 5.10 Blasting and Vibration 125 5.11 Air Quality 134 5.12 Roading and Traffic 141 5.13 Lighting 144 5.14 Historic Heritage 144 5.15 Terrestrial Ecology 145 5.16 Hazardous Substances 146 5.17 Public Access and Recreation 146 5.18 Cultural Values 146 5.19 Social Impacts 148 5.20 Conclusion 151 6. Management and Monitoring of Actual and Potential Environmental Effects _______ 152 7. Consultation _______________________________________________________ 160 7.1 IWI 160 7.2 Direct Consultation With Landowners and Local Residents 161 7.3 Media 162 8. Statutory Considerations ______________________________________________ 163 8.1 Introduction 163 8.2 Information Requirements 163 8.3 Section 104D of the Resource Management Act 1991 163 8.4 Section 104 of the Resource Management Act 1991 165 8.5 Section 105 of the Resource Management Act 1991 213 8.6 Section 106 of the Resource Management Act 1991 215 8.7 Section 107 of the Resource Management Act 1991 215 9. Concluding Statement ________________________________________________ 217 Part 3: Appendices Project Martha – Assessment of Environmental Effects LIST OF FIGURES Figure 1.1: Indicative Area of the Martha Underground Mine 2 Figure 1.2: Indicative Area of the Phase 4 Cutback (Cutback Area in Blue / Proposed Noise Bunds in Red) 3 Figure 2.1: Hauraki District Plan Land Use Zones – Phase 4 Cutback 7 Figure 2.2: Hauraki District Plan Land Use Zones – Martha Underground Mine 7 Figure 2.3: Composition of the Waihi Economy 10 Figure 2.4: Overview of Existing Mining Activities / Infrastructure 12 Figure 2.5: Martha Pit Zoning and Permit Overlays 14 Figure 2.6: Historic Underground Mining Areas 15 Figure 2.7: Historic Martha Mine Underground Workings – Relative to Martha Underground Mine 15 Figure 2.8: Layout of the Processing Plant and Water Treatment Plant 18 Figure 2.9: Water Management System Overview 20 Figure 2.10: Rock Stockpiles and Tailings Storage Facilities 22 Figure 2.11: Current Rehabilitation and Closure Plan for the Martha Pit 25 Figure 2.12: Key Road Links 29 Figure 2.13: Hourly Traffic Flows on State Highway 2 30 Figure 2.14: Hourly Traffic Flows on State Highway 25 31 Figure 2.15: Bulltown / Cambridge Roads in the vicinity of Martha Pit 32 Figure 2.16: Barry Road and State Highway 25 Intersection 33 Figure 2.17: Existing Noise Control Boundaries – Martha Pit 35 Figure 2.18: Generalised Geology in the Waihi Area 38 Figure 2.19: Aerial View of Waihi Outcrop Geology, Veins and Faults 39 Figure 2.20: Conceptual Water Balance for the Waihi Area 39 Figure 2.21: Ohinemuri River and Tributaries 41 Figure 2.22: Boundaries of the Waihi Airshed 48 Figure 2.23: Hourly average wind speeds and directions for Waihi 1 January 2007 – 31 December 2017 49 Figure 2.24: Monthly Average Rainfall January 2007 – December 2017 50 Figure 3.1: Conceptual Long Section of the Ore Sources - Martha Underground Mine 52 Figure 3.2: Avoca Stoping Method 54 Figure 3.3: Conceptual Schematic of the Side Ring Method 55 Figure 3.4: Indicative Extent of Unfilled Stopes to be Filled 56 Figure 3.5: Unfilled Voids to be Filled by Level 57 Figure 3.6: Typical Batching Plant and Proposed Location at the Processing Plant 59 Figure 3.7: New Surface Expressions for the Martha Underground Mine 60 Figure 3.8: Proposed Road Re-Alignment and Noise Bund 64 Figure 3.9: Concept Plan for the Re-Alignment of Bulltown / Cambridge Roads 65 Figure 3.10: Phase 4 Cutback Staging 66 Figure 3.11: Anticipated Rock Disposal Schedule 71 Project Martha – Assessment of Environmental Effects Figure 3.12: Tailing Storage Facility Capacity – Project Martha 72 Figure 3.13: Estimated Direct Employment for Project Martha 73 Figure 5.1: Visual simulation of the View from Cambridge Road 95 Figure 5.2: Visual simulation of the change in view of Martha Pit from the Pump House 96 Figure 5.3: Landscape Concept Plan for the Phase 4 Cutback 98 Figure 5.4: Ground Settlement Assessment Zones 105 Figure 5.5: Private Bores in Waihi 107 Figure 5.7: Conceptual Outline of Pit Lake Limestone Dosing System 116 Figure 5.8 Mangatoetoe Stream flood inundation map without (left) and with (right) the Pit Lake Discharge (100-year ARI event). 119 Figure 5.9: Closest Dwellings not owned by OGNZL 122 Figure 5.10: Representative Locations - Vibration Envelope Modelling 129 Figure 5.11: Vibration Monitoring Locations Recommended by Heilig (2018) 133 Figure 5.12: Locations of Houses within 200 m of the Phase 4 Cutback Overlaid with a Wind Rose. 136 Figure 5.13: Recommended Trigger Values for Wind Speeds for Works within 200 m of Sensitive Receptors Located within 100 m of the Project Boundaries 140 LIST OF TABLES Table 2.1: Hauraki District Plan Noise Standards. 36 Table 2.2: Authorised Vibration Levels. 37 Table 2.3: Low Flow Estimates for the Ohinemuri River and Ruahorehore Stream 42 Table 2.4: Flood Flow Estimates for the Ohinemuri River and Ruahorehore Stream 42 Table 2.5: Summary Statistics for Water Quality – Ohinemuri River 42 Table 2.6: Summary Statistics for Water quality – Mangatoetoe Stream 44 Table 2.7: Significant Trees in the Hauraki District Plan 47 Table 3.1: Hazardous Substances for the Martha Underground Mine 62 Table 3.2: Hazardous Substances for the Phase 4 Cutback 69 Table 3.3: Anticipated Disposal Locations for Rock 71 Table 3.4: Indicative Project Milestones 72 Table 4.1: Project Martha Consent Requirements (HDC) 74 Table 4.2: Project Martha Consent Requirements (WRC) 81 Table 4.3: Commencement, Lapse and Term of Consent Sought 84 Table 4.4: Existing Resource Consents Being Relied on During Project Martha 87 Table 5.1: Waihi Mines Contribution to the New Zealand Economy – With and Without Project Martha 93 Table 5.2: Estimate Settlement Response to Dewatering for Project Martha 106 Table 5.3: Predicted Construction Noise During Noise Bund Construction (dB LAeq) 121 Project Martha – Assessment of Environmental Effects Table 5.4: Predicted Noise Levels – Mining Activities 123 Table 5.5: Development and Production Blasting 126 Table 5.6: Blasting Limits Recommended by Heilig (2018) 127 Table 5.7: Mitigation measures implemented by the current Air Quality Management Plan to mitigate dust. 138 Table 5.8: Expected Vehicle Numbers for Project Martha 141 Table 6.1: Summary of Key Management and Monitoring Measures for Project Martha 154 Table 8.1: Consideration of Alternative Methods of Discharge 214 LIST OF APPENDICES Appendix A: Legal Description of Properties Supporting Project Martha Appendix B: Economics Assessment (Sense Partners) Appendix C: Existing Resource Consents: Waikato Regional Council Appendix D: Visual and Landscape Assessment (Boffa Miskell) Appendix E: Traffic Assessment (Traffic Design Group) Appendix F: Noise Assessment (Hegley Acoustics) Appendix G: Vibration Assessment (Heilig Partners) Appendix H: Groundwater Assessment (GWS Limited) Appendix I: Water Management Assessment (GHD) Appendix J: Freshwater Ecology Assessment (Boffa Miskell) Appendix K: Heritage Assessment (Clough & Associates) Appendix L: Air Quality Assessment (BECA) Appendix M: Geotechnical Assessment: Martha Underground Mine (AMC) Appendix N: Subdivision Plan for the re-alignment of Bulltown / Cambridge Roads Appendix O: Proposed Consent Conditions Appendix P: Pit Stability Assessment from the Martha Underground Mine (PSM) Appendix Q: Pit Stability Assessment for the Phase 4 Cutback (PSM) Appendix R: Ground Settlement Assessment (Engineering Geology Limited) Appendix S: Geochemical Assessment (AECOM) Appendix T: Hydrodynamic Assessment of the Pit Lake (Hydronumerics) Appendix U: Martha Pit Lake Management Strategy (AECOM) Appendix V: Pit Lake Limnology Assessment (Hydronumerics) Appendix W: Social Impact Summary (Phoenix Research) Appendix X: Property Valuations (Telfer Young) Appendix Y: Consultation Material Project Martha – Assessment of Environmental Effects 1 PART 1 Application

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