Tonkin & Taylor Ltd Hazardous Substances Technical Assessment – Waihi North Project - Storage and use of hazardous substances at Willows Road site and the Wharekirauponga Underground Mine Oceana Gold (New Zealand) Limited June 2022 Job No: 1015212.1000 vRev0 Table of contents 1 Introduction 1 1.1 Project overview 1 1.2 Assessment approach and background documents 1 1.3 Definitions 2 2 Description of proposed activities and substances 2 2.1 Site location 2 2.2 Proposed activities involving hazardous substances 3 2.2.1 Willows Road portal site 3 2.2.2 WUG 4 2.3 Hazardous substances classification and quantities 5 3 Sensitivity of local environment 9 3.1 Willows Road portal entrance site 9 3.2 WUG 11 4 Control and management of hazardous substances 13 4.1 Introduction 13 4.2 Health and Safety at Work (Hazardous Substances) regulatory controls 14 4.2.1 Magazine certification 16 4.2.2 Magazine separation 16 4.2.3 Hazardous substance location for ANE 18 4.3 Hazardous substances management 19 4.4 Explosives hazard management 20 4.4.1 Explosives management plans and responsibilities 20 4.4.2 Security 20 4.4.3 Fire protection systems 20 4.4.4 Ventilation (underground) 21 4.5 Emergency management 21 4.6 Secondary containment 21 4.7 Separation requirements 24 4.8 Refuelling area 25 4.9 Water treatment 26 4.10 Signage 26 4.11 Transport of hazardous substances 26 4.12 Waste management 28 5 Overpressure offset distances assessment 29 5.1 Overview 29 5.2 Surface magazine offsets 29 5.3 Underground explosives storage facility offsets 32 6 Resource consent requirements 36 7 Risk Assessment for Hazardous Substances 37 7.1 Introduction 37 7.2 Assessment method 37 7.3 Risk assessment 38 7.3.1 Hazard analysis 38 7.3.2 Partial Quantitative analysis of Class 1 explosion 41 7.3.3 Risk analysis 44 8 Assessment of effects 46 8.1 Introduction 46
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