22 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 Control measure Facility and substances Purpose of control Ferric chloride, hydrogen peroxide, hydrated lime Development Site Class 1 explosive substances, LPG, diesel These plans help to minimise the consequence of an emergency event, such as through preventing a small spill reaching a drain, extinguishing a small fire or enabling safe evacuation of an effected area. Separation from public and protected spaces Processing Plant Caustic soda, hydrochloric acid, cyanide (solid), cyanide solution, mercury, oxygen, diesel WTP Hydrogen peroxide Development Site LPG, diesel, controlled zones apply for the explosives Minimises any adverse event in the store impacting on public places or protected places, and correspondingly any off site event from impacting the store. Tracking and record-keeping Processing Plant Cyanide (solid), cyanide solution, hydrochloric acid and mercury. WTP Not applicable Development Site Class 1 explosives A record is required to be kept for explosive or highly toxic substances, which details the identity of the person in control of the substance (see: Certified Handler), the location and quantity of the substance, any transfer of the substance to other locations, and details regarding any disposal of the substance including the date, manner, quantity and location of the substance disposed. This ensures that highly toxic substances are at all times either under the control of an appropriately trained worker or secured, and that the location of the substance is known throughout its lifespan in New Zealand. Certified handler Processing Plant Cyanide (solid), cyanide solution, hydrochloric acid, mercury WTP Not applicable Development Site Class 1 explosives A Certified Handler is a person who is trained and qualified (holds a Certified Handler Compliance Certificate) to handle acutely toxic or explosive substances. This control restricts activities involving these substances to people with demonstrated competency. Hazardous Substances Location Compliance certification required Processing Plant Diesel, oxygen, cyanide solution, hydrochloric acid, caustic soda WTP Hydrogen peroxide, ferric chloride, hydrated lime Development Site Class 1 explosives, LPG, diesel Independently certifies that the hazardous substance location where explosive, flammable, oxidising, toxic or corrosive substances are stored or used, has in place all applicable controls and notifications to manage the hazards (such as segregation of incompatibles, secondary containment, access restrictions).
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