21 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 The proposed underground storage facility will be equipped with a water deluge fire suppression system in addition to dry chemical powder fire extinguishers required by the HSW-HS regulations. These fire-fighting facilities will help to reduce the consequence in the event that a fire is initiated at the explosives stores by smothering the ignition source and preventing a detonation. 4.4.4 Ventilation (underground) The underground storage area ventilation has been designed in accordance with the guidance provided in AS 2187.1 Explosives - Storage, Transport and Use for underground storage. Negative pressure ventilation will exhaust directly from the chamber to the return airway. Louvres that will open in a fail-state will be installed to ensure regulated airflow into the chamber in the event of an emergency. 4.5 Emergency management Emergency response for any incidents associated with the hazardous substances storage site will be managed under a site-specific Principal Control Plan for Emergency Management. OGNZL’s existing Principal Control Plan - Waihi Emergency Management (seeAppendix G) serves as an indicative plan in this respect. This control plan sets out the requirements for emergency response for chemical exposure incidents, spills or fire. Spill kits and fire extinguishers will be provided around the mining operation for emergency response, and any clean-up material will be removed from site to a facility authorised for the disposal of hazardous substances. All staff will be trained in the Control Plan and drills for potential scenarios will be held periodically to test the site response and to identify and correct any issues. In the event of an unintended detonation of explosives or fire in the ANE storage area, OGNZL have an Emergency Response Team on call to respond to any emergency on site and to manage any necessary evacuations of the site and wider community. Planning for emergency scenarios enables the operator to minimise the consequence of an event to the environment by detailing the appropriate actions. 4.6 Secondary containment All packaged liquid substances will be stored within secondary containment. The containment capacity will be at minimum the required quantity set out in the HSW-HS as identified inTable 4.3, and constructed of material impervious to the substance stored. All substances will be stored such that incompatible substances are segregated. All storage of diesel (either at the surface or underground) will be in double-skinned tanks which provide full secondary containment. Provision of secondary containment for hazardous liquids minimises the consequence of a tank leak by preventing contact with the environment, and minimises the likelihood of a loss to the environment.
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