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 6 basement rocks are unconformably overlain by volcanic and intrusive rocks of the Coromandel Group and volcanics flows and related pyroclastics of the Whitianga Group. The Whitianga Group Rhyolite flows and related volcaniclastic rocks are commonly associated with calderas (Malengreau et al., 2000). Several structural trends are observed in the Coromandel Volcanic Zone as shown in Figure 4. Regional fault structures exhibit variable extents in strike lengths and are mostly steeply dipping. North to northwest strike dominates in the north, while northeast to east-northeast strike characterise structures on the central and southern portions of the Peninsula (Spörli et al., 2006). The northeast structural trend encompasses a highly prospective corridor for gold mineralization as affirmed by the presence of some large deposits such as Karangahake, Komata, Golden Cross and includes the Wharekiraupongadeposit. Figure 4 Geology of the Coromandel Region (Edbrooke, 2001) 2.5 Site Geology The geology is described as Whiritoa Andesite on the eastern side of the valley which is truncated by the Edmonds Fault that dips to the west. Whakamoehau Andesite is located on the western side of the valley and is described as being post mineralisation Andesite and dacite flow with Andesite tuff breccia and recent colluvial cover. The mineralised unit is described as the Edmonds Formation that is composed of rhyolitic flows and lapilli tuff that is commonly hydrothermally altered. The mineralised rhyolitic volcanics are fault bound and it is interpreted that they are uplifted to some degree.
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