36 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 6 Resource consent requirements The HDP uses the Hazardous Facilities Screening Procedure (HFSP) to determine the consent activity status of activities involving hazardous substances based on the calculated effects ratio for the activity. The permitted effects ratio specified for activities within the Rural zone is 0.25. The HFSP for the proposed hazardous substances stored in the Rural Zone adjacent to the portal entrance at Willows Road is attached as Appendix H. The explosive storage has been input as if it were entirely booster explosives, as these have the highest human health and environment hazard rating for all three effect types (all explosives have the same fire/explosion hazard rating). The effects ratio for each effect type is summarised below: Fire/Explosion effect ratio: 38.4 Human health effect ratio: 3.3 Environment effect ratio: 3.0 Each effect ratio exceeds the Rural Zone permitted effects ratio for the storage and use of hazardous substances at the portal location and is therefore a restricted discretionary activity under Rule 7.7.8(1)(a). There is no permitted effects ratio specified for activities within the Conservation (Indigenous Forest) zone, and as such the storage and use of explosives, oxidisers and diesel within the tunnel and WUG is a non-complying activity under Rule 7.7.10.1. OGNZL intends to apply for a proposed plan change to the hazardous substances section of the HDP. The purpose of the proposed plan change is to provide for the effective, consistent and efficient regulation of the storage, use, disposal and transportation of hazardous substances by mining related activities. Changes to the performance standards and activity statuses are proposed, but there are no changes to the objectives and policies.
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