27 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 4.5: Delivery schedule for substances associated with the WUG and Willows Road site Substance Hazard class Pre-2021 Proposed maximum volume Storage location Delivery frequency Delivery volume ANFO 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) Weekly 2000 kg NEQ Booster 1.1D, 6.1C, 6.9B, 9.1B Packaged explosive 1.1D, 6.1D, 6.3A, 6.4A, 6.8C, 6.9A, 9.1A, 9.3C Detonators 1.1B 10 kg NEQ (10,000 articles) Surface explosive magazine (separate to others) Weekly 2,450 units 100 kg NEQ (100,000 articles) Underground chamber (separate to others) Weekly 2,450 units Diesel 3.1D, 6.1E, 6.3B, 6.7B, 9.1B 80,000 L Services bay at the SFA Weekly 20,000 L 6,000 L WUG portable tank Daily 6,000 L 550 L Generator tank at the SFA Sporadic 550 150 L Fire pump at the SFA Sporadic 150 Ammonium nitrate emulsion (ANE) 5.1.1B 6.1E 6.4A 9.1D 40,800 kg Oxidiser IBC storage area – SFA Weekly 30,000 kg 34,000 kg Oxidiser IBC storage area – underground Weekly 30,000 kg
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