39 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 7.1: Hazard analysis Hazardous substance and quantity stored Identification of potential hazard properties (Hazard level1) Failure Modes Exposure pathways / Affected part of environment Indicative hazard rating Potential for off-site effects ANFO 7,350 kg (surface) 6,000 kg (underground) Fire/Explosion effects (high) Human health (low) Ecotoxicity (low) Fire in storage area; Spill to environment during delivery or movement People, property, ecosystems Low hazard to ecosystems as substance is a granular solid. High explosion hazard. Yes Effects due to fire/explosion to be considered further. Booster 7,350 kg (surface) 6,000 kg (underground) Fire/Explosion effects (high) Human health (moderate) Ecotoxicity (high) Fire in storage area; Spill to environment during delivery or movement People, property, ecosystems Low hazard to ecosystems as substance is packed into small individual cardboard or plastic units. High explosion hazard. Yes Effects due to fire/explosion to be considered further. Packaged explosive 7,350 kg (surface) 6,000 kg (underground) Fire/Explosion effects (high) Human health (low) Ecotoxicity (high) Fire in storage area; Spill to environment during delivery or movement People, property, ecosystems Low hazard to ecosystems as substance is packed into small individual plastic units. High explosion hazard. Yes Effects due to fire/explosion to be considered further. Detonators 10 kg (surface) 100 kg (underground) Fire/Explosion effects (high) Fire in storage area; People, property High explosion hazard. Yes Effects due to fire/explosion to be considered further. ANE 40,800 L (surface) 34,000 kg (underground) Fire/Explosion effects (high) Ecotoxicity (low) Fire in storage area; Spill to environment during delivery or movement People, property, ecosystems Low hazard to the environment as substance is a highly viscous emulsion, considered a solid for storage and transport purposes. High fire hazard. Yes Effects due to fire/explosion to be considered further.
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