GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 61 Table G.16 Predicted groundwater discharge to surface water bodies during operational TSF scenario Surface water body Estimated groundwater discharge to surface water body (m3/day) (SEEP/W) Percentage change in groundwater discharge from current conditions (SEEP/W) Percentage change in groundwater catchment Gladstone Wetland / Ohinemuri tributary (TB4) 0.7 -33% -22% Ohinemuri tributary (TB5) 0 0% 0% Ohinemuri River east of Gladstone (OH3) 49 -<1% -12% Ohinemuri River west of Gladstone (OH6) 157 -27% -19% Table G.17 Predicted groundwater discharge to surface water bodies during TSF closure scenario Surface water body Estimated groundwater discharge to surface water body (m3/day) (SEEP/W) Percentage change in groundwater discharge from current conditions (SEEP/W) Percentage change in groundwater catchment Gladstone Wetland / Ohinemuri tributary (TB4) 2.7 +156% +84% Ohinemuri tributary (TB5) 0 0% 0% Ohinemuri River east of Gladstone (OH3) 57 +15% +10% Ohinemuri River west of Gladstone (OH6) 211 -2% -7% Table G.18 Predicted groundwater discharge to surface water bodies during long-term TSF scenario Surface water body Estimated groundwater discharge to surface water body (m3/day) (SEEP/W) Percentage change in groundwater discharge from current conditions (SEEP/W) Gladstone Wetland / Ohinemuri tributary (TB4) 3.2 +197 Ohinemuri tributary (TB5) 5 NA* Ohinemuri River east of Gladstone (OH3) 57 +15% Ohinemuri River west of Gladstone (OH6) 314 +46% * Calculation not undertaken as no groundwater baseflow predicted during current conditions The predicted flux of tailings porewater to the deep groundwater system, and discharge through the drainage system installed beneath the geosynthetic liner at the base of the tailings during the operational TSF and TSF closure scenarios is presented in Table G.19.
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