GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 47 Figure 28 WSFA Flow Diagram 6.1.1.1 Willows Rock Stack Development The WRS totalling a footprint of 5.5 Ha (7.7 Ha including additional disturbed areas associated with the WRS) will be required to be constructed to store rock (from predominantly the WUG Access Tunnel) at WSFA throughout the LOM. The WRS is assumed to be progressively built over the duration of the tunnelling activities. The WBM assumes the area of the WRS is in parallel with the rock produced. Eventually the rock within the WRS is returned to the tunnel for backfilling. It is assumed that collected runoff and seepage from the WRS is directed to the WRS collection pond prior to treatment. Figure 29 illustrates the assumed WRS development that has been applied to the WBM.
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