2 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 The assessment of the impact of explosives has been informed by two assessments prepared by Global Seismic Solutions (GSS): theWillows Road – Surface Magazine Location Assessment, Waihi North Project, 20 October 2021 attached as Appendix A and theWharekirauponga Underground Mine (WUG) Class 1 Storage Assessment, 10 December 2021 attached as Appendix B. The GSS reports identify the following supplementary guidance which informed the design of the facilities and quantification of impacts from Class 1 explosives storage: AS 2187.1 Explosives—Storage, Transport and Use, Part 1: Storage International Ammunition Technical Guideline (IATG 2.20), Quantity and Separation Distances (United Nations - Safer Guard) (2nd Edition 01.02.2015) International Ammunition Technical Guideline (IATG 1.80), Formulae for Ammunition Management (United Nations - Safer Guard) (2nd Edition 01.02.2015). This assessment report has been prepared to supplement theWaihi North Project – Resource Consent Applications and Assessment of Environmental Effects prepared by Mitchell Daysh Limited, dated June 2022. 1.3 Definitions The following terms are used throughout the report and have distinct meanings as set out in the Ministry for the Environment’s Assessment Guide for Hazardous Facilities (2000) or the Resource Management Act 1991: Hazard – describes physical situations, process and/or actions that have the potential to exert adverse effects on people, ecosystems and/or the built environment. Risk – is the likelihood of specified consequences of a specific event (e.g., explosion) on people, ecosystems and/or the built environment. Therefore, the magnitude of risk is the product of probability and consequence (Risk = Probability x Consequences). Effect – means any impact or change as a result of an activity and, as defined by Section 3 of the RMA, can be positive or negative, temporary or permanent, applicable to the past, present or future, or cumulative with other effects. 2 Description of proposed activities and substances 2.1 Site location Figure 2.1 shows an overview of some of the key elements of the WNP, from the tunnel portal to the WUG in the Coromandel Forest Park. The key supporting infrastructure is proposed to be located at the tunnel portal entrance site at Willows Road, Waihi and is referred to as the surface facilities area (SFA). At a later stage in the WUG development, some hazardous substances storage will be located underground within the WUG to facilitate the mining operations.
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