13 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 Substance State Hazard Classification Proposed maximum volume Storage location and description Pre-2021 Post-2021 Cyanide (Liquid 30%) Liquid 6.1B 6.1C 6.5B 6.8B 6.9A 8.1A 8.2B 8.3A 9.1A 9.2A 9.3A 9.4A. Acute oral, inhalation toxicity Category 2 Acute dermal toxicity Category 3 Skin sensitisation Category 1 Reproductive toxicity Category 2 Specific target organ toxicity – single or repeat exposure Category 1 Corrosive to metals Category 1 Skin corrosion Category 1B Serious eye damage Category 1 Hazardous to the aquatic environment acute or chronic Category 1 Hazardous to soil organisms Hazardous to terrestrial vertebrates Hazardous to terrestrial invertebrates 112,000 L Tank within the Processing Plant. Located on the eastern side of the reagent storage. Cyanide (solid) Solid 6.1B 6.1C 6.3B 6.4A 6.5B 6.8B 6.9A 8.1A 9.1A 9.2A 9.3A 9.4A. Acute oral, inhalation toxicity Category 2 Acute dermal toxicity Category 3 See Note 1. Eye irritation Category 2 Skin sensitisation Category 1 Reproductive toxicity Category 2 Specific target organ toxicity – repeated or chronic exposure Category 1 Corrosive to metals Category 1 Hazardous to the aquatic environment acute Category 1 Hazardous to the aquatic environment chronic Category 1 Hazardous to soil organisms Hazardous to terrestrial vertebrates Hazardous to terrestrial invertebrates 77,180 kg Boxed storage (1,135 kg each) within the Processing Plant. Located in a building on the eastern side of the reagent storage.
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