GHD | Oceana Gold NZ Ltd | 12552081 | Geochemical Assessment Wharekirauponga Underground Mine (WAI985-000-REP-LC-0013) 15 Table 2 Geochemistry of Spoil Material – WUG Mine Parameter WUG Mine 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 (%) 9,495 0.91 0.84 0.01 10.0 0.03 4 4-6 Total Carbon (%) 34 0.02 0.01 0.01 0.18 - - - MPA (%CaCO3) 34 2.60 2.15 0.04 8.77 - - - ANC (%CaCO3) 34 0.73 0.40 -0.40 2.90 - - - ANC/MPA 34 0.89 0.20 -0.31 8.01 - - - AP (kg CaCO3/tonne) 34 26.1 21.9 0.37 87.8 - - - NP (kg CaCO3/tonne) 3 34 1.30 0.83 0.83 15.0 - - - NNP (kg CaCO3/tonne) 34 -10.6 -8.9 -86.1 81.0 - - - NPR 34 0.19 0.04 0.01 2.27 - - - NAG pH 34 4.10 3.80 2.70 7.30 - - - Major Elements Aluminium (%) 9,495 3.32 4.67 0.02 14.3 8.2 0 0 Iron (%) 9,495 1.52 1.46 0.10 10.2 4.1 0 0 Calcium (%) 9,495 0.18 0.06 0.01 9.78 4.1 0 0 Magnesium (%) 9,495 0.14 0.07 0.01 2.54 2.3 0 0 Sodium (%) 9,495 0.09 0.04 0.01 1.85 2.3 0 0 Potassium (%) 9,495 2.80 2.88 0.01 7.83 2.1 0 0-1 Trace Elements 4 Antimony 14,736 9.08 5.26 0.02 460 0.2 5 2-6 Arsenic 14,773 214 136 0.50 10,000 1.5 7 2-5 Barium 10,894 323 120 0.50 3,790 500 0 0 Cadmium 10,894 0.05 0.03 0.02 0.99 0.1 0 0-2 Cobalt 10,894 2.46 1.90 0.10 48.1 20 0 0 Trace Elements 4
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