22 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 4.3: Secondary containment minimum provisions Substance State Hazard Class Pre-2021 Proposed maximum volume Storage Location Secondary containment minimum requirement (HSW-HS regulation ref) ANFO Solid 1.1D, 6.1D, 6.3B, 6.7B, 9.1D 7,350 kg NEQ 6,100 kg NEQ Surface explosive magazines (max. 1,300 kg NEQ in any magazine) Underground chambers (max. 1,000 kg NEQ in any chamber) Not required for solids Booster Solid in card casing 1.1D, 6.1C, 6.9B, 9.1B Not required for solids Packaged explosive Plastic encapsulated emulsion 1.1D, 6.1D, 6.3A, 6.4A, 6.8C, 6.9A, 9.1A, 9.3C Not required for solids Detonators Solid article 1.1B 10 kg NEQ (10,000 articles) Surface explosive magazine (separate to others) Not required for solids 100 kg NEQ (100,000 articles) Underground chamber (separate to others) Diesel Liquid 3.1D, 6.1E, 6.3B, 6.7B, 9.1B 40,000 L Services bay – SFA Containment capacity of at least 110% of the largest container (r17.100) or integral containment1: Double skinned containment provided for each tank. 6,000 L WUG 550 L Generator tank – SFA 150 L Fire pump – SFA
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