GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project D-3 Table 3 Ohinemuri Water Quality – OH6 Analytes Units Count Minimum Maximum Mean Median Alkalinity - Total g/m3 as CaCO3 28 7.4 26.0 18.2 18.8 Antimony-Dissolved g/m3 106 0.0002 0.0031 0.0009 0.0007 Arsenic-Dissolved g/m3 30 0.001 0.001 0.001 0.001 Bicarbonate g/m3 at 25°C 28 9 32 22 23 Cadmium-Dissolved g/m3 30 5.00E-05 5.00E-05 5.00E-05 5.00E-05 Calcium-Dissolved g/m3 31 3 169 81 83 Chloride g/m3 28 11.0 27.0 15.9 15.0 Chromium-Hexavalent g/m3 30 0.001 0.01 0.009 0.01 Cyanide-Total g/m3 28 0.002 0.002 0.0020 0.002 Cobalt-Dissolved g/m3 28 0.0002 0.0026 0.0010 0.0008 Copper-Dissolved g/m3 31 0.0005 0.0102 0.0011 0.0005 Electrical Conductivity mS/m 30 8 108 54 57 Hardness-Total g/m3 as CaCO3 31 15 510 235 250 Iron-Dissolved g/m3 30 0.05 0.21 0.08 0.07 Lead-Dissolved g/m3 30 0.0001 0.00028 0.0001 0.0001 Magnesium-Dissolved g/m3 31 1.54 21 7.9 7.9 Manganese-Dissolved g/m3 30 0.005 0.083 0.023 0.0178 Mercury-Dissolved g/m3 30 8.00E-05 8.00E-05 8.00E-05 8.00E-05 Nickel-Dissolved g/m3 30 0.0005 0.001 0.0005 0.0005 Total Ammoniacal N g/m3 32 0.01 0.69 0.19 0.10 pH pH units 106 6.4 8.5 7.1 7.1 Potassium-Dissolved g/m3 28 2.5 9.4 4.2 3.75 Selenium-Dissolved g/m3 106 0.0002 0.0048 0.0011 0.0010 Sodium-Dissolved g/m3 28 10 50 21 20 Sulphate g/m3 28 35 520 244 250 Zinc-Dissolved g/m3 30 0.001 0.0076 0.003 0.00205
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