49 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 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 Mercury (10 L) Human toxicity (high) Ecotoxicity (high) Container leak/rupture during recovery and storage for disposal. People, ecosystems High human health hazard and high hazard to ecosystems in the event of a spill or fire Yes Human health and effects on ecosystems to be considered further. ANFO (6,400 kg NEQ) 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. Boosters (6,400 kg NEQ) 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 units. High explosion hazard. Yes Effects due to fire/explosion to be considered further. Packaged explosive (6,400 kg NEQ) 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 units. High explosion hazard. Yes Effects due to fire/explosion to be considered further. Detonators (12 kg NEQ) Fire/Explosion effects (high) Fire in storage area People and property. High explosion hazard. Yes Effects due to fire/explosion to be considered further. 1. The hazard level is specified according to the hazard classification in Table 1 of the Land Use Planning Guide for Hazardous Facilities, MfE 2002.
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