40 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 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 Gasser 8,000 L (surface) 4,000 kg (underground) Human health (low) Ecotoxicity (low) Spill to environment during delivery or movement People, ecosystems Low hazard to human health, substance would need to come into direct contact with a person off site. Substance is stored in a bunded area and used underground. Yes Effects to the environment due to a spill to be considered further. Diesel 80,700 L (surface) 6,000 L (underground) Fire/Explosion effects (low) Human health (low) Ecotoxicity (medium) Fire in storage area; Spill to environment during delivery or movement People, property, ecosystems Low hazard to human health and for fire as diesel has low flammability and will be stored in a dedicated area segregated from ignition sources. Moderate hazard to the environment in a spill. Yes Effects due to a fire or a spill to be considered further. Calcium carbonate (lime) 70,000 kg Human health (low) Spill to environment during delivery or movement Rupture of silo People, ecosystems Low hazard to human health, substance would need to come into direct contact with the eye tissue of a person off site. Substance is stored in a silo at the surface infrastructure area. Silo is fitted with fabric filters for dust emission control. No Effects not considered further Oxygen 60 m3 Fire/Explosion effects (high) Fire in storage area People, property High fire hazard Yes Effects due to fire to be considered further. Acetylene 20 m3 Fire/Explosion effects (high) Fire in storage area People, property High fire hazard Yes Effects due to fire to be considered further. Oils and grease 8,000 kg Ecotoxicity (high) Container leak or rupture during unloading or storage. Ecosystems Low hazard to ecosystems in the event of a spill Yes Environmental effects to be considered further. 1. A hazard level is assigned to each hazard class in the Land Use Planning Guide for Hazardous Facilities, MfE 2002.
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