4 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 2.2: Layout of Willows Rd portal entrance site highlighting key areas Source: OGNZL Civil drawings showing details of the SFA layout are included inAppendix C. 2.2.2 WUG At a later stage of WUG development, underground hazardous substances stores are proposed as follows: Storage of explosives in six separate H.E. chambers and one I.E. chamber; Storage of ammonium nitrate emulsion (ANE) and gasser, which are mixed in-situ to produce an explosive substance when packed into the blast hole; and Up to two small portable double skinned refuelling units containing diesel. Deliveries of these substances will be made at either the Willows Road or Waihi portal entrance sites and transported via tunnel to the underground storage locations indicated onFigure 2.3. The H.E. and I.E. chambers will be located at a depth of 380 m.
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