GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project D-1 Table 1 Ohinemuri Water Quality – OH3 Analytes Units Count Minimum Maximum Mean Median Alkalinity - Total g/m3 as CaCO3 24 6.4 26.0 15.6 15.4 Antimony-Dissolved g/m3 27 0.0002 0.0002 0.0002 0.0002 Arsenic-Dissolved g/m3 27 0.001 0.001 0.001 0.001 Bicarbonate g/m3 at 25°C 24 7.8 29 19 18.75 Cadmium-Dissolved g/m3 27 5.00E-05 5.00E-05 5.00E-05 5.00E-05 Calcium-Dissolved g/m3 27 3 4 3 3 Chloride g/m3 24 9.0 14.0 11.6 11.5 Chromium-Hexavalent g/m3 27 0.001 0.01 0.009 0.01 Cyanide-Total g/m3 24 0.002 0.002 0.0020 0.002 Cobalt-Dissolved g/m3 26 0.0002 0.0003 0.0002 0.0002 Copper-Dissolved g/m3 27 0.0005 0.0009 0.0005 0.0005 Electrical Conductivity mS/m 27 8 11 9 9 Hardness-Total g/m3 as CaCO3 25 7 13 9 8 Iron-Dissolved g/m3 27 0.05 0.21 0.11 0.1 Lead-Dissolved g/m3 27 0.0001 0.00016 0.0001 0.0001 Magnesium-Dissolved g/m3 27 1.4 2.6 2.0 1.97 Manganese-Dissolved g/m3 27 0.0009 0.051 0.010 0.0063 Mercury-Dissolved g/m3 27 8.00E-05 8.00E-05 8.00E-05 8.00E-05 Nickel-Dissolved g/m3 27 0.0005 0.0005 0.0005 0.0005 Total Ammoniacal N g/m3 27 0.01 0.23 0.02 0.01 pH pH units 27 6.6 8.7 7.3 7.2 Potassium-Dissolved g/m3 24 1.75 2.7 2.1 2 Selenium-Dissolved g/m3 27 0.0002 0.0010 0.0003 0.0002 Sodium-Dissolved g/m3 27 8 11 9 9 Sulphate g/m3 26 3 9 5 5 Zinc-Dissolved g/m3 27 0.001 0.0067 0.002 0.0015
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