SECTION 2 Environmental Setting C:\D Data\GWS C Drive\GWS\Client Files\1344 OGL - WKP\4 Deliverables\WKP Final Draft Report\June Report\WAI-985-000-REP-LC-0030. Final_Rev_0.docx 9 Geophysics and surface mapping has shown extensive hydrothermal alteration of the rockmass associated with the mineralisation phase of the deposit’s formation. Figure 7 shows the distribution of alteration which largely consists of moderate to strong clay alteration with a zone of silicification centred around the vein system. As discussed later in this report, the alteration of the rock is important in determining how groundwater will respond to dewatering during mining. Figure 7 Surface Mapped Hydrothermal Alteration Zones (Map modified from Grieve and Bartle (2013) and Christie et al. (2016)). 2.6 Catchment Scale Hydrogeology The overall hydrogeologic setting of the Wharekirauponga area is that of a groundwater discharge zone where streams gain from groundwater emanating from the surrounding hill
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