24 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 4.7 Separation requirements The HSW-HS regulations require separation distances between substances with hazards to human health or property from potentially sensitive locations within the boundary, such as worker lunch rooms or offices, and from any areas off-site where members of the public may be present. The minimum separation distances to protected and public places (including the site boundary) specified in the HSW-HS regulations are designed to mitigate3 the risk of: any adverse event in the store impacting on public places or protected places, and any adverse event at public places or protected places impacting on the store. The separation distances provided to off-site locations are detailed inTable 4.4 below. Table 4.4: Separation requirements under the HSW-HS for hazardous substances Substance name Identified separation requirements Comments ANE Segregated from all incompatible substances, which includes a substance that is not a class 5.1.1 or 5.1.2 substance but that is classified in class 5.2, or in any of classes 1, 2, 3, 4, 6.1A, 6.1B, 6.1C, or 8 any organic matter, or substance that contains carbon, in a form that will combust with the class 5.1.1 or 5.1.2 substance zinc or magnesium in any form, and any other metal in powdered form any substance or material that will combust with air, or will combust with or catalyse the decomposition of a class 5.1.1 or 5.1.2 substance Minimum separation distances: 8 m to incompatible substances 8 m to ignition sources (or 5 m if the packages remain closed at all times) The ANE is segregated from other hazardous substances in a dedicated store in the SFA and in two dedicated chambers in the WUG. The store at the SFA is approximately 80 m from the nearest OGNZL boundary to the east of the SFA, complying with the separation requirements. The storage areas have been designed to ensure ANE and gasser are separated by a minimum of 10 m. The ANE storage location at the SFA is over 300 m from the surface magazine compound for Class 1 explosives. Gasser Segregated from all Class 1 substances, Class 4, Class 5, and Class 8.2A and 8.2B corrosive alkalis/acids. The storage areas have been designed to ensure ANE and gasser are separated by a minimum of 10 m. The hazard class for gasser does not trigger separation requirements in the HSW-HS to protected or public places. However, the storage location at the surface is over 80 m to the site boundary. 3 Policy Clarification, Storing class 6 and 8 hazardous substances, WorkSafe NZ, November 2019
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