GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 14 Table 2 Calculated WTP Inflow Concentrations and Removal Rates (2019-2020) WTP (2019 / 2020) Inflow Source Minewater Decant Water Silt Pond Seepage Calculated Inflow Concentrati on Actual Outflow Concentra tion Calculated Removal Efficiency Inflow Volume (m3 total) 5,728,816 1,199,326 - - 2019/2020 Inflow Ratio 0.83 0.17 - - CN (WAD) 0.01 0.79 0.002 0.01 0.15 0.01 0.93 Fe 5 0.04 <0.02 3.4 4.1 0.04 0.99 Mn 8.5 0.76 0.3 7.1 7.2 0.01 0.10 Cu 0.001 1.3 0.0009 0.0005 0.23 0.004 0.98 Ni 0.018 0.058 0.0059 0.06 0.03 0.001 0.96 Zn 0.28 0.079 0.0081 0.035 0.25 0.002 0.99 Ag <0.0002 0.0044 <0.0001 <0.0001 0.001 <0.0002 0.88 Sb 0.0069 0.007 <0.0002 <0.0002 0.007 0.004 0.44 As 0.01 0.005 <0.001 <0.001 0.009 0.002 0.78 Se 0.0021 0.070 <0.001 <0.001 0.014 0.002 0.86 Hg <0.00008 <0.00008 <0.00008 <0.00008 <0.00008 <0.00008 0.63# Cd 0.00043 0.00037 <0.0001 <0.0001 0.0004 <0.0001 0.76 Cr <0.001 <0.001 <0.001 <0.001 <0.001 <0.01 - Pb 0.0003 0.022 <0.0001 <0.0001 0.004 0.0002 0.95 TSS 970 19 11 5 810 2 0.10 Ammoniac al N 0.3 13 0.025 1.7 2.5 0.98 0.61 *Trace element concentrations are dissolved and based on filtered samples. #Mercury removal rate is based on data from 2005 to 2007
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