28 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 Substance Hazard class Pre-2021 Proposed maximum volume Storage location Delivery frequency Delivery volume Gasser 6.1D 6.4A 6.5B 6.6B 6.9B 8,000 L Gasser IBC storage area – SFA Weekly 1,000 L 4,000 L Gasser IBC storage area – underground Weekly 1,000 L Calcium carbonate (Lime) 6.4A 70,000 kg Lime silo in SFA Monthly 30,000 kg Oxygen 5.1.2A 60 m3 Cylinder storage in workshop at SFA Monthly 30 m3 Acetylene 2.1.1A 20 m3 Cylinder storage in workshop at SFA Monthly 10 m3 Oils, greases* 6.1D 6.1E 6.3A 6.4A 6.5B 6.9B 9.1B 9.1C 8,000 L Bulk tanks, IBCs or drums in workshop stores in SFA Monthly 5,000 L 4.12 Waste management The only potentially hazardous waste anticipated as a part of the storage of explosives is the packaging, which may be contaminated with explosive residue. The method for disposal of packaging is set out in OGNZL’s Disposing of Explosives and Packaging Procedure and involves controlled destruction by a Certified Handler at a designated controlled-access burn-off site. This procedure will be followed at all times. If required, ANFO may be disposed of by dissolving with water; this is to be done under direct supervision of an authorised person. Where the quantity of explosives to be disposed of is significant (>10 kilograms packaged product), it will be stored and returned to the supplier for disposal. Hazardous waste associated with the use of ANE and gasser within the WUG includes the empty IBCs which are removed to the surface, collected in their designated area of the storage compound in the SFA, before removal off site to an authorised hazardous waste facility. Any hazardous waste generated through a spill event is to be notified to the Manager-Sustainability . The Manager ensures that disposal is in accordance with the relevant OGNZL Compliance Standards, and Regional and Local authority requirements.
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