GHD | Oceana Gold NZ Ltd | 12552081 | Geochemical Assessment Wharekirauponga Underground Mine (WAI985-000-REP-LC-0013) 12 Table 1 Geochemistry of Spoil Material – Willows Access Tunnel Parameter Willows Access Tunnel Mean Concentration in Earth’s Crust 1 Geochemical Abundance Index2 Martha Material Abundance Index2/5 n Arithmetic Mean Median Minimum Maximum Acid Generating Potential Total Sulphur (%) 48 3.57 3.18 0.01 19.1 0.03 6 4-6 Total Carbon (%) 49 0.53 0.29 0.01 2.36 - - - MPA (%CaCO3) 49 11.2 9.93 0.02 59.6 - - - ANC (%CaCO3) 6 49 6.09 4.10 0.60 22.8 - - - ANC/MPA 49 8.83 0.54 0.02 12.5 - - - NPR 49 4.47 0.20 0.00 7.21 - - - NAG pH 49 5.10 3.10 2.00 11.1 - - - Major Elements Aluminium (%) 19 7.50 7.48 6.01 9.69 8.2 0 0 Iron (%) 20 4.21 4.06 3.02 7.45 4.1 0 0 Calcium (%) 20 1.97 1.58 0.26 5.90 4.1 0 0 Magnesium (%) 20 0.99 1.06 0.32 2.20 2.3 0 0 Sodium (%) 20 0.11 0.06 0.03 0.65 2.3 0 0 Potassium (%) 20 1.63 1.74 0.44 2.81 2.1 0 0-1 Trace Elements 4 Antimony 20 0.78 0.87 0.06 1.89 0.2 1 2-6 Arsenic 20 44.8 36.6 1.95 221 1.5 4 2-5 Barium 19 210 201 90.0 412 500 0 0 Cadmium 20 0.12 0.10 0.02 0.27 0.1 0 0-2 Cobalt 20 15.0 15.5 11.5 19.3 20 0 0 Chromium 20 4.44 2.37 0.78 33.6 100 0 0 Copper 20 18.8 17.2 9.54 43.5 50 0 0-3 Lead 20 17.2 13.8 6.81 37.0 14 0 0-1 Mercury 20 0.11 0.08 0.02 0.51 0.05 0 0-3
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