GHD | Oceana Gold NZ Ltd | 12552081 | Geochemical Assessment Wharekirauponga Underground Mine (WAI985-000-REP-LC-0013) 24 6. Spoil Management A single rock stack with a footprint of 5.5 ha will be required to be constructed to store tunnel and mine spoil at Willows Road Farm. The temporary WRS is proposed to be constructed in a valley west of the portal area at Willows Road Farm as shown on Figure 18. The WRS will be built in a manner that will limit the oxidation of PAF material stored within and will be progressively built over the duration of the tunnelling activities. Figure 18 WRS and Collection Pond Outline It is assumed the working area of the WRS is proportional to the tunnel spoil produced as per the provided production schedule. Eventually the spoil within the WRS will be returned to the tunnel as backfill. The assumed WRS development is outlined in Figure 19. Figure 19 WRS Development
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