GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project E-4 of these catchment areas drain to a collection pond or sump with a defined volume and pumping rate. In the model there is some variation applied to account for catchment development over time. Table 1 Catchment Areas Name Description Area (ha) Runoff Factor Volume (m3) Modelled Pumping Withdrawal Rate (m3/d) Water Treated For WRS Collection Pond Runoff and seepage from WRS 5.5 0.5 10,383 4,320 Trace elements TSF1A Tailings storage facility 1A 38.8 1.0 See stagevolume relationships 12,000 Cyanide and trace elements TSF2 Tailings storage facility 2 41.5 1.0 See stagevolume relationships 12,000 Cyanide and trace elements TSF3 Tailings storage facility 3 60.7 1.0 See stage volume relationships 12,000 Cyanide and trace elements GOP TSF Tailings storage facility in GOP 18 1.0 See stage volume relationships 12,000 Cyanide West Silt Pond Runoff from TSF2 embankments 28.72 0.7 12,472 23 Trace elements S3 Runoff from TSF1A embankments 27.46 0.7 44,688 1,651 Trace elements S4 (modified with the construction of TSF3) Runoff from TSF1A embankment 17.61 0.7 45,100 597 Trace elements S5 (decommissioned with construction of TSF3) Runoff from TSF1A embankment 20.5 0.7 34,465 1,283 Trace elements S6 (replaces S5) Runoff from TSF1A embankment 20.5 0.7 34,465 1,283 Trace elements S7 Runoff from TSF3 embankment 24 0.7 80,000 2,000 Trace elements NRS Silt Pond Runoff from the NRS 41.5 0.7 80,000 2,000 Trace elements Gladstone Pit Runoff within the Gladstone Pit 18 0.7 - 3,000 Trace elements Mill Pond Process area ponds 8.6 1.0 21,132, combined 526, combined Cyanide Favona Stockpile Area 9.81 0.6 Cyanide TCP1A 0.46 0.7 Cyanide TCP2 1.03 0.7 Cyanide
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