SECTION 6 Gladstone Open Pit and TSF C:\D Data\GWS C Drive\GWS\Client Files\1344 OGL - WKP\4 Deliverables\WUG Effects Summary\June 2022\WNP Groundwater Effects Summary_Final_Rev_0.docx 21 6.2 Characterisation The geology of the area has been investigated from exploration drilling and from general operational monitoring. GHD have undertaken hydrogeological investigation for the project and OGL have undertaken investigations in relation to the wetland hydrogeology. In addition to the groundwater investigations, surface water gaugings have been conducted to assist in characterising the site hydrology. Investigation locations are shown on Figure 22. Figure 22 Site Investigation Locations (from GHD 2022) 6.3 Hydrologic and Hydrogeologic Setting The geology in the vicinity of Gladstone consists of a weathered upper andesite with some hydrothermal breccia included. Young volcanics are present on the eastern and southern flanks of Gladstone Hill. Alluvium is present to the south and west. At the location of the Gladstone Wetland, dacite exists that supports the wetland and forms the neighbouring Black Hill. Figure 23 shows the conceptual hydrogeology of the Glandstone Hill area.
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