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 23 Figure 24 Gladstone Hill Zone of Dewatering Plan (From GHD 2022) Figure 25 Gladstone Hill Zone of Dewatering Section (From GHD 2022) Effects on Surface Waters During mining the potential effects associated with dewatering of the Gladstone pit could include a reduction in surface water flows via tributaries to the Ohinemuri River (TB4 and TB5) and losses from the Ohinemuri River via the stream bed. These locations are shown on Figure 26. Direct effects on the Ohinemuri River via stream bed loss is not expected due to the presence of a thick sequence of young volcanics and alluvium that overlies the vein system to be dewatered. Drainage effects at the Gladstone wetland are not expected as the wetland is perched on low permeability dacite rocks.
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