Oceana Gold New Zeland Limited Hydrogeology Support for WKP Underground Updated Conceptual Model Figure 2-1 Location of boreholes with hydraulic testing data ................................................................................ 3 Figure 3-1 Correlation between Golder and FloSolutions results.......................................................................... 8 Figure 3-2 Comparison between result values (Golder x FloSolutions) ................................................................ 8 Figure 3-3 Cloud of points (Water Level Data) imported in Leapfrog .................................................................. 12 Figure 3-4 Interpolated Surface in Leapfrog (water table) ................................................................................... 12 Figure 3-5 Cross section along WKP104............................................................................................................. 13 Figure 3-6 Cross section along WKP-101 and WKP-103.................................................................................... 13 Figure 3-7 Cross section along WKP-105 ........................................................................................................... 14 Figure 3-8 Cross section along WKP-102 and WKP-P04D................................................................................. 14 Figure 4-1 Shallow piezometer locations............................................................................................................. 15 Figure 4-2 Hydrographs for shallow piezometers ................................................................................................ 16 Figure 4-3 Schematic section showing conceptual shallow groundwater ........................................................... 17 Figure 4-4 Schematic cross section of WKP-102 and WKP-04D........................................................................ 18 Figure 4-5 Water losses registered in along the contact between Rhyolite Volcanoclastics and Rhyolite Flow Dome (red area)................................................................................................................................. 19 Figure 4-6 Schematic cross section of WKP-101 and WKP-103 ........................................................................ 20 Figure 4-7 Conceptualization of potential flow barriers ....................................................................................... 21 Figure 4-8 Shallow groundwater conditions. Left - water losses in the shallow zone. Right - unsaturated test intervals.............................................................................................................................................. 21 Figure 4-9 Schematic cross section of WKP-105 ................................................................................................ 22 Figure 4-10 Water levels west and east of the HW-EG-West Veins ................................................................... 22 Figure 4-11 Schematic cross section of WKP-104 .............................................................................................. 24 Figure 4-12 Schematic cross section of WKP-03D ............................................................................................. 25 Figure 4-13 Section WKP-03D / WKP-104, showing water levels....................................................................... 26 Table 2-1 Drill collars and survey data for tests holes, VWPs, and standpipe piezometers ................................. 4 Table 3-1 Summary of Packer testing analyses .................................................................................................... 7 Table 3-2 Summary of the results encountered in Golder analysis (37 results).................................................... 9 Table 3-3 Summary of the results encountered in FloSolutions analysis (36 results) .......................................... 9 Table 3-4 Standpipe piezometers and VWP data ............................................................................................... 10 Table 3-5 Detail of projected coordinates and calculated water levels for each interval tested .......................... 11 Table 4-1 Installation depths and water table elevations for shallow piezometers.............................................. 16
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