GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 67 Table 15 Ohinemuri in-stream water quality and modelled water quality at sample location OH6 OH6 (Modelled Data) Consented Receiving Water Quality Chemical Parameter Maximum Daily Mean Max Hardness 20 g/m3 CaCO3 Hardness 100 g/m3 CaCO3 pH Not Modelled 6.5 – 9.5 Temperature 22.6 26.8 <3°C Rise Cyanide, WAD (g/m3) 0.004 0.018 0.093 0.093 Iron (g/m3) 0.30 0.46 1.0 1.0 Manganese (g/m3) 0.036 0.059 2.0 2.0 Copper (g/m3) 0.0011 0.0031 0.003 0.011 Nickel (g/m3) 0.0033 0.0033 0.04 0.160 Zinc (g/m3) 0.0040 0.0062 0.027 0.100 Silver (g/m3) < 0.0001 < 0.0001 0.00025 0.00284 Antimony (g/m3) 0.0027 0.0058 0.03 0.030 Arsenic (g/m3) 0.0028 0.0050 0.19 0.190 Selenium (g/m3) 0.0011 0.0023 0.02 0.020 Mercury (g/m3) < 0.00008 < 0.00008 0.000012 0.000012 Cadmium (g/m3) 0.0003 0.0005 0.0003 0.001 Chromium VI (g/m3) < 0.01 < 0.01 0.01 0.01 Lead (g/m3) 0.0001 0.0002 0.0004 0.0025 TSS (g/m3) Not Modelled +10 g/m3 compared to upstream where upstream < 100 g/m3 or <10% increase Ammoniacal N (g/m3) 0.89 1.93 0.189 – 3.01 Major cations / Anions Ca2+ 167 333 N/A Mg2+ 36 44 N/A Na+ 35 44 N/A K+ 7 12 N/A SO4 2+ 660 1033 N/A *Trace element concentrations are dissolved *Where all samples of the monitoring period were below the mdl, the concentration is given as <mdl. Otherwise the mdl is used as the concentration for the specific sample 1. Dependent on temperature and pH. Refer to Table 2 of RC 971323 (and RC 971285, 971311, 971312, 971303-971306). Consent refers to Total Ammonia.
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