GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 43 Table G.2 Gladstone pit perimeter section lengths for scaling flux across the pit boundary Pit section Measured pit section perimeter length (m) Adopted pit section justification North 380 Includes shallow aquifer units of similar thickness, and regions of inferred andesite outcrop, from the north-western side of the pit to approximate topographic divide on north-eastern side of the pit. East 247 Includes shallow aquifer units of similar thickness between the two approximate topographic divides on the north-eastern and south-eastern sides of the pit. South 425 Includes shallow aquifer units of similar thickness between the two approximate topographic divides between the south-eastern side of the pit and Winner Hill on the south-western side of the pit. West 510 Incorporates relatively thick shallow aquifer units on the south-western side of the pit between elevated Winner Hill and where andesite is indicated to outcrop on the northwestern side of the pit. Figure G.2 Adopted perimeter sections for scaling flux across the pit boundary G.1.1.2 Groundwater catchment methodology To compare the results of groundwater modelling, a comparative assessment was undertaken for changing groundwater recharge catchment areas. A groundwater recharge catchment area for each surface water body was defined using conceptual understanding, with flow paths determined from groundwater modelling and topographic contours. The catchment areas change during each scenario assessed due to changing groundwater levels and groundwater flow paths. Following rewatering of the deep groundwater system and cessation of TSF drainage
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