46 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 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 High calcium hydrated lime (3 x 102,000 L tanks) Human toxicity (low) Ecotoxicity (low) Valve leak, pipe failure, accidental release during use and unloading People, ecosystems Low hazard to human health. Low hazard to ecosystems Yes Due to the low hazard and large distances to sensitive receptors, the potential for offsite human health effects is not considered further in the risk analysis. Effects on ecosystems to be considered further. High calcium quicklime (70 tonne silo near water tanks) Human toxicity (low) Ecotoxicity (low) Hopper or connection failure during silo refill Spill during transferring to works area. People, ecosystems Low hazard to human health. Low hazard to ecosystems No Due to the low hazard and large distances to sensitive receptors, the potential for offsite human health effects is not considered further. Effects on ecosystems to be considered further. Caustic Soda (50%) (24,000 L) Human toxicity (medium) Ecotoxicity (low) Valve leak, pipe failure, accidental release during use and unloading People, ecosystems Moderate hazard to human health by direct skin contact. Low hazard to ecosystems in a spill. Yes Human health effects and effects on ecosystems to be considered further.
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