Tonkin & Taylor Ltd Hazardous Substances Technical Assessment – Waihi North Project - Waihi Processing Plant, Water Treatment Plant and Development Site Oceana Gold (New Zealand) Limited June 2022 Job No: 1015212.1000 vRev0 5 Resource consent requirements 40 6 Overpressure offset distances assessment 41 7 Risk assessment for hazardous substances 44 7.1 Introduction 44 7.2 Assessment method 44 7.3 Risk assessment 45 7.3.1 Hazard analysis 45 7.3.2 Partial quantitative analysis of Class 1 explosion 50 7.3.3 Consideration of known industry events 51 7.3.4 Risk analysis 51 8 Assessment of effects on the environment 54 8.1 Introduction 54 8.2 Hazardous substances 54 8.2.1 Effects on people and property 54 8.2.2 Effects on ecosystems 56 8.2.3 Cumulative effects 57 8.2.4 Transport 58 9 Conclusion 59 10 Applicability 61 Appendix A Location assessment Appendix B List of Workshop Hazardous Substances Appendix C Hazardous Substances Management Plan Appendix D Waihi Emergency Management Plan Appendix E Principal Hazard Control Plan – Surface explosives Appendix F Principal Hazard Control Plan –Underground explosives Appendix G Qualitative risk analysis Appendix H Mine Safety Bulletin
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