25 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 Overall, these zones are considered a precautionary emergency response measure and not indicative of the extent of actual off-site effects. Further emergency response measures that apply at OGNZL sites are detailed in Section 4.6 and 4.7. 4.5.2 Explosives Principal Hazard Management Plan The Principal Hazard Management Plan (PHMP) for Surface Explosives6 and the PHMP for Underground Explosives7 set out the details of management of all aspects of storage, handling and use of explosives at the Waihi mining operation. Hazard management to minimise the risk of an unintended detonation is critical to worker safety on site, as well as for prevention of on site property damage. These measures to manage the risk of a detonation incident will also minimise the potential for effects on off-site receptors. These PHMPs are attached as Appendix EandAppendix F respectively. These plans will be updated to address the site specific matters relevant to the proposed Class 1 storage area at the Development Site prior to its commission. The key roles with responsibilities for control of hazards associated with the explosives storage and use on site include: Magazine keeper – responsibilities include housekeeping and maintenance of the explosives storage site, signage and locking devices; upkeep of all documentation (licences, certifications and inventory records); and access to keys to magazine site. Approved handlers – Certified for safe handling of explosive substances by a WorkSafe accredited external certifier; responsible for supervising all movements of explosives and equipment on site. 4.6 Spill and emergency management plan The WEMP outlines the emergency management procedures for OGNZL’s mining activities including the Processing Plant and Development Site, as well as at the open pit and underground mining operations and exploration operations further afield. In the event of an emergency the relevant operation will alert security via telephone or through a dedicated radio channel. Security will then initiate emergency procedures, which include: An overall spill response plan is provided in Appendix L for the main hazardous substances kept at the OGNZL facilities. Specific cyanide emergency procedures are provided as Appendix M to the WEMP; Trigger Action Response Plans (TARP) included as Appendix N to the WEMP detail the appropriate emergency response coordination for a variety of foreseeable incident types. The following scenarios are relevant to the hazardous substance activities: Explosives emergency; Process Plant chemical spill or gas leak; and Fire at the surface facilities. Each TARP outlines three response levels based on the severity of the incident: Level 1 is localised response managed by the mine staff; Level 2 will involve the dedicated emergency response team with external support on stand-by; and Level 3 warrants external assistance from emergency services and implementation of the OGNZL crisis management plan. 6 OceanaGold, Principal Hazard Management Plan – Surface Explosives WAI-350-PLN-003, (Waihi site, reviewed Oct 2017) 7 OceanaGold, Principal Hazard Management Plan – Waihi Underground Explosives WAI-400-PLN-007, (Waihi site, reviewed May 2021)
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