Supporting Technical Assessments

GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 63 G.2.2 Gladstone vein dewatering assessment results The predicted groundwater table during current conditions and in the Gladstone vein dewatering scenario is presented in Figure G.10. The predicted unsaturated zone within the andesite (where pore-water pressure is less than zero Kpa) is presented in Figure G.11, and Table G.22. Figure G.10 Current and predicted groundwater table during current conditions and Gladstone vein dewatering (SEEP/W) Figure G.11 Predicted unsaturated zone (pore water pressure less than zero kPa) within deep andesite in Gladstone vein dewatering scenario (SEEP/W) 1,084.0 1,084.1 1,084.2 1,084.3 1,084.4 1,084.5 1,084.6 1,084.7 1,084.8 1,084.9 1,085.0 0 100 200 300 400 500 600 700 800 900 1000 Groundwater table (mRL) Distance (m) Current conditions scenario Gladstone vein dewatering scenario Northwest Southeast -450 -400 -350 -300 -250 -200 -150 -100 -50 0 0 100 200 300 400 500 600 700 800 900 1000 Pore water pressure in andesite (kPa) Distance (m) Northwest Southeast

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