Oceana Gold New Zeland Limited Hydrogeology Support for WKP Underground Updated Conceptual Model Figure 4-6 Schematic cross section of WKP-101 and WKP-103 From the data presented in this figure below and the data processed this section shows: Hydraulic conductivity values range from 5.8E-8 m/s to 7.6 E-6 m/s. Tests in the footwall of the EG vein have higher permeability than the hanging wall (almost 1 order magnitude difference). The shallow portion of the section west of the HW-EG-West veins, has low hydraulic conductivity values. Two tests in the stockwork zone experienced a big water intake during testing, and higher K values have been calculated in this zone (7.8E-6 m/s and 6.9E-6 m/s). Water levels are relatively consistent at all test locations and depths east of the HW-EGWest veins. In the eastern part of this cross-section, the EG vein aquifer system appears well- connected, with consistent water elevations across a wide range of test locations, depths, and lithologies (Figure 4-7). These conditions confirm that the EG vein aquifer is hydraulically connected across the test zones in this section. In the western part of this section, there is a step-like change in water level elevation with consecutive downhole tests, introducing the possibility of compartmentalization in the shallow groundwater system. It is possible that some of the veins are low permeability, consistent with hydraulic tests results in this area, and form barriers to groundwater movement. This is illustrated conceptually in Figure 4-7.
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