25 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 Substance name Identified separation requirements Comments Diesel Segregated from all Class 1, Class 2, Class 3.2, Class 4, Class 5 substances. The separation distances specified for the largest storage area (80,000 L in the SFA) are as follows: 5.4 m away from protected areas or the boundary The closest diesel tank to the boundary in the SFA is separated from the northeast boundary by approximately 35 m. All diesel tanks are segregated from the proposed ANE and gasser storage area. Oxygen 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 A minimum separation of 3 m to incompatible substances and ignition sources applies to storage of oxygen cylinders. The oxygen gas cylinders will be stored at the workshop in the SFA in a secure location with chains for cylinder restraint. Oxygen and acetylene gas storage will be segregated. The workshop is approximately 100 m from the nearest site boundary to the northeast. The workshop is approximately 100 m from the nearest site boundary at Mataura Stream to the northeast, and over 40 m from the ANE store. Acetylene Segregated from all Class 1, Class 2.1.2, Class 3, Class 4, Class 5 substances. The separation distances specified for the acetylene: 5 m away from protected areas, public places or the boundary The acetylene will be secured upright in a dedicated location against the workshop on the western portion of the SFA. The workshop is approximately 100 m from the nearest site boundary to the northeast. The acetylene storage area will be segregated from any storage of oxygen gas cylinders. 4.8 Refuelling area During tunnelling, refuelling of equipment will be undertaken via a dedicated fuel truck, drawing from a surface located self-bunded isotainer located in the SFA with a nominal capacity of 80,000 litres. As the tunnel progresses, up to two self-bunded and appropriately certified tanks will be installed underground to store up to 6,000 L of diesel for underground use. The portable tanks have been selected as they are suitable for underground refuelling units, which include features like thermally and manually activated fire enclosure with dry chemical fire suppression, 110% spill containment around the tank and pumps and automatic shut off valves.
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