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 or mercury. The risk to the environment will be managed through site design (secondary containment, automation including interlock systems, segregation of incompatible substances, certification of storage systems tanks), and operational procedures (e.g. emergency response plan including dedicated plans for high risk substances, routine maintenance and inspections, spill response plans, dedicated mine rescue response team, standard operating and delivery procedures for key hazardous substances). In particular, cyanide poses a high hazard to the environment due to its high toxicity to both humans and ecological receptors. OGNZL has provided additional structural controls within the Processing Plant to retain hazardous liquid spills in engineered ponds in the event of an accidental release. Taking into account these controls, the effects on people, property and the environment from the use and storage of hazardous substances have been assessed as less than minor. The risks to people, property and the environment from an unintended detonation at the proposed explosives storage locations is assessed as low and will be managed through site and equipment design (e.g. separation distances to offsite locations and other explosives stores, provision of fire protection systems and certification of the explosives storage magazines) and management controls (personnel access restrictions, security monitoring, staff training and handler certification, and emergency response plans). With consideration of the proposed controls, the effects on the environment from the use and storage of hazardous substances at the Processing Plant, Water Treatment Plant and proposed new explosives storage facility on the Development Site have been assessed as less than minor and consistent with the HDP objectives and policies for hazardous substances.
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