GHD | Oceana Gold (New Zealand) Limited | 12537997 | Gladstone Pit TSF 26 Figure 14 Liner installation sequence Figure 15 shows the backfill elevation vs volume curve for the pit. RL 1060 m represents the elevation of the GOP TSF floor. This shows that approximately 40% of the total backfill is required to be placed in the base of the pit before any lining occurs. Subsequent 10 m lifts progressively get smaller, ranging from 450,000 m3 to 250,000 m3 of backfill material up to the final elevation (RL 1105 m). Similarly, Figure 16 shows the liner area vs elevation curve. This shows that the liner area for a 10 m lift ranges from approximately 16,000 to 35,000 m2, with the final 10 m lift having the largest liner area. Figure 15 Total backfill quantity versus elevation for the GOP TSF 1000 1020 1040 1060 1080 1100 1120 0 500,000 1,000,000 1,500,000 2,000,000 2,500,000 3,000,000 Elevation, RL (m) Total backfill quantity (m3)
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