3 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 Figure 2.1: Overview of portal entry at Willows Road, tunnel pathway and WUG mine area 2.2 Proposed activities involving hazardous substances 2.2.1 Willows Road portal site The following activities at the Willows Road tunnel portal site (seeFigure 2.2) will store and use hazardous substances: Storage of explosives at six H.E magazines and one I.E magazine located southwest of the portal. These explosives substances will be transported via an internal access road to the tunnel portal where they will be charged at the development face and within the underground mine; A store for ammonium nitrate emulsion and gasser will be established at the northern end of the SFA adjacent to the portal. These two substances will be transported via internal access road and used in tunnel development and underground mining; A covered, sealed service workshop in the SFA that will store gas cylinders (oxygen, acetylene) for welding/cutting and oils and greases for servicing of mechanical equipment; Diesel will be stored in above ground double skinned refuelling units at a services bay in the SFA; and A smaller volume of diesel may also be stored in association with the fire protection system to power the water pumps and in a small tank to service the site emergency power generator. Table 2.1 details the proposed quantities and locations of hazardous substances at Willows Road.
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