Supporting Technical Assessments

10 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 Figure 3.2: Relocation of LPG tanks and the existing workshop on the OGNZL Development Site Source: Aerial imagery and property boundary information sourced from the LINZ Data Service and licensed for re-use under the Creative Commons Attribution 3.0 New Zealand licence 3.4.2 Explosives storage OGNZL proposes to install a new Class 1 explosives storage facility to service ongoing mining operations . Table 3.1 details the existing and proposed explosives storage quantities andFigure 3.3 indicates the locations of each within the wider OGNZL site, showing the separation of approximately 1.2 km between the existing sites and the coordinates of the proposed Class 1 explosives store at the Development Site. Each of the existing surface explosives storage sites consist of a levelled area of road base on which a relocatable magazine (storage container) is placed within a perimeter of secure alarmed fencing. Table 3.1: Explosives store sites operated by OGNZL Ref Location Substances stored Quantity 1 Existing surface site A Mass explosion blasting explosives 2,000 kg, within approved magazines 1 Existing surface site B Mass explosion detonators, Mass explosion blasting explosives 1,500 kg, within approved magazines 2 Underground storage facility – subject of separate consent application3 Mass explosion detonators, Mass explosion blasting explosives 6,030 kg, within approved storage chambers 3 Consented Martha Pit site Mass explosion detonators, Mass explosion blasting explosives 8,000 kg, within approved magazines 4 Proposed new explosives storage facility – Development Site Mass explosion detonators, Mass explosion blasting explosives 6,412 kg, within approved magazines 3 Land use application LUSE - 202.2021.00001482.001

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