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 21 In addition to the standpipe piezometers, permeability testing was also undertaken in the WKP-P03D bore prior to the vibrating wire piezometer tips being installed. Two intervals were tested: from 188 m to end of hole at 218 m and from 204 m to end of hole at 218 m. Analysis of these test indicates the vein zone dominates the test interval and that the permeability of this zone is in the order of 1x10-5 m/s. This value is consistent with textural observations for TStream Vein materials and from other veins in the Coromandel formed in similar deposits. Packer Testing To obtain more targeted permeability data within the veins and host rock units, packer testing was undertaken. The tests were performed by Alton drilling under the supervision of OGL and Golder staff. Data from a total of 38 individual packer tests from 7 boreholes were provided for review and analyses, distributed as follows: WKP-101: 7 Tests WKP-102: 6 Tests WKP-103: 6 Tests WKP-104: 4 Tests WKP-105: 5 Tests WKP-P04D: 3 Tests WKP-P05D: 7 Tests The packer tests were analysed by Golder and verified by Flosolutions. The complete set of results is included in the Golder report (Nov, 2021) and Flosolutions report (April, 2022) summarised below. Table 3 Packer Test Permeability Summary Results Test Type Verified Results (m/s) Constant Pressure Geomean 4.4E-06 Max. 3.1E-05 Min. 9.9E-08 Packer Tests Geomean 1.8E-07 Max. 1.1E-05 Min. 3.8E-10 As discussed in the Golder and Flosolutions reports, the permeability measurements obtained through packer testing were targeted towards more permeable structures introducing some bias into the data set. Typical observation of the vein system permeability is in the order of 1x10-5 to 1x10-6 m/s, fractured rockmass between 1x10-6 to 1x10-7 m/s and less fractured rockmass 1x10-7 to 1x10-8 m/s. These values are consistent with those observed elsewhere in the Coromandel for similar rock types. 3.6 Surface Water Gauging Surface water gauging have been undertaken in the Wharekirauponga catchment by WSP since 2019 with a gauging of various extents having been undertaken. Initial gauging were limited to a few locations, subsequent events were extended to include other locations. In December 2020 the entire Wharekirauponga catchment and portions of adjacent catchments were measured. A summary of the key gauging location’s in the catchment is provided in Table 4. The location of these gauging point is shown on Figure 23.
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