GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project D-4 Table 4 Ruahorehore Water Quality – RU1 Analytes Units Count Minimum Maximum Mean Median Alkalinity - Total g/m3 as CaCO3 24 7.6 22.0 15.6 17.6 Antimony-Dissolved g/m3 26 0.0002 0.0002 0.0002 0.0002 Arsenic-Dissolved g/m3 26 0.001 0.001 0.001 0.001 Bicarbonate g/m3 at 25°C 24 9.3 27 19 21.5 Cadmium-Dissolved g/m3 26 5.00E-05 1.10E-04 5.35E-05 5.00E-05 Calcium-Dissolved g/m3 26 4 19 7 5 Chloride g/m3 24 11.0 17.0 14.5 14.0 Chromium-Hexavalent g/m3 26 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 0.0003 0.0065 0.0022 0.0017 Copper-Dissolved g/m3 26 0.0005 0.0005 0.0005 0.0005 Electrical Conductivity mS/m 26 11 25 15 15 Hardness-Total g/m3 as CaCO3 24 9 32 15 14 Iron-Dissolved g/m3 26 0.07 0.29 0.16 0.145 Lead-Dissolved g/m3 26 0.0001 0.00014 0.0001 0.0001 Magnesium-Dissolved g/m3 26 1.87 5.6 2.8 2.6 Manganese-Dissolved g/m3 26 0.0088 0.24 0.034 0.022 Mercury-Dissolved g/m3 26 8.00E-05 8.00E-05 8.00E-05 8.00E-05 Nickel-Dissolved g/m3 26 0.0005 0.0031 0.0006 0.0005 Total Ammoniacal N g/m3 26 0.01 0.091 0.02 0.01 pH pH units 26 6.4 7.4 7.1 7.1 Potassium-Dissolved g/m3 24 2.9 6.6 4.2 3.8 Selenium-Dissolved g/m3 26 0.0002 0.0010 0.0004 0.0003 Sodium-Dissolved g/m3 24 10 26 15 15 Sulphate g/m3 26 9 57 27 24 Zinc-Dissolved g/m3 26 0.001 0.02 0.003 0.002
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