SECTION 3 Site Investigations & Results 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 17 geotechnical parameters allows a better understanding of the ability for groundwater to move through the rockmass and provides an estimate of the hydraulic conductivity. As a general rule the fracture density within the rockmass is bimodal. That is there tends to be 5-7 fractures per meter typically, however in more brittle zones nearer the orebody twice that number of defects are noted. This is interpreted to be a function of the increased silicification of the rockmasses adjacent to the ore body. Figure 18 shows an example from borehole WKP52. Figure 18 WKP52 RQD and Fractures/m vs Depth Adopting the fracture spacings from the boreholes and assuming a range of fracture apertures, it is possible to estimate hydraulic conductivity values based on empirical methods (Snow, 1968). These calculations indicate a permeability of 2x10-8 m/s for typical rockmass and up to 8x10-8 m/s for more fractured zones. These values are consistent with those permeability values measured by other methods.
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