GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project D-2 Table 2 Ohinemuri Water Quality – OH5 Analytes Units Count Minimum Maximum Mean Median Alkalinity - Total g/m3 as CaCO3 28 7.3 26.0 18.4 19.3 Antimony-Dissolved g/m3 108 0.0002 0.0036 0.0009 0.0006 Arsenic-Dissolved g/m3 31 0.001 0.001 0.001 0.001 Bicarbonate g/m3 at 25°C 28 8.9 31 22 23.5 Cadmium-Dissolved g/m3 31 5.00E-05 5.00E-05 5.00E-05 5.00E-05 Calcium-Dissolved g/m3 32 3 160 71 73 Chloride g/m3 28 10.0 25.0 15.3 15.0 Chromium-Hexavalent g/m3 31 0.001 0.01 0.009 0.01 Cyanide-Total g/m3 28 0.002 0.008 0.0023 0.002 Cobalt-Dissolved g/m3 30 0.0002 0.0021 0.0005 0.0003 Copper-Dissolved g/m3 32 0.0005 0.0119 0.0013 0.0005 Electrical Conductivity mS/m 31 9 90 49 50 Hardness-Total g/m3 as CaCO3 32 13 440 205 215 Iron-Dissolved g/m3 31 0.04 0.23 0.09 0.08 Lead-Dissolved g/m3 31 0.0001 0.00024 0.0001 0.0001 Magnesium-Dissolved g/m3 32 1.43 14.8 6.9 7 Manganese-Dissolved g/m3 31 0.0047 0.053 0.013 0.011 Mercury-Dissolved g/m3 31 8.00E-05 8.00E-05 8.00E-05 8.00E-05 Nickel-Dissolved g/m3 31 0.0005 0.0005 0.0005 0.0005 Total Ammoniacal N g/m3 34 0.01 1.04 0.20 0.14 pH pH units 108 6.5 8.8 7.3 7.2 Potassium-Dissolved g/m3 28 2.3 6.6 3.6 3.15 Selenium-Dissolved g/m3 108 0.0002 0.0053 0.0011 0.0010 Sodium-Dissolved g/m3 28 10 36 18 17 Sulphate g/m3 30 21 410 206 205 Zinc-Dissolved g/m3 31 0.001 0.0051 0.002 0.0013
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