| Conclusion | Waihi North Project Air Discharge Assessment - Waihi Surface Facilities | 4396626-1331619777-99 | 16/06/2022 | 78 Table D1. Summary of metal emission rates and discharge concentration - 2021 emission testing programme Metal Electrowinning Stack Gold Room Furnace Stack Discharge concentration (µg/m3) Discharge rate (g/h) Discharge concentration (µg/m3) Discharge rate (g/h) Silver 7.69 0.2 295.3 3.76 Aluminium 10.54 0.027 3.8 0.048 Arsenic 0.33 0.0009 0.16 0.002 Gold 3.83 0.01 82.7 1.052 Boron BDL (<1.88) BDL (<0.005) 30.6 0.383 Barium 1.14 0.003 0.17 0.0021 Cadmium BDL (<0.002) BDL (<.00005) 7.84 0.0979 Cobalt 0.016 0.00004 BDL (<0.011) BDL (<0.00017) Chromium 0.75 0.0019 0.61 0.0078 Copper 6.18 0.016 4.97 0.063 Iron 11.7 0.03 5.43 0.069 Mercury 1.15 0.003 72.56 0.926 Manganese 1.37 0.0036 0.37 0.0046 Nickle 4.91 0.013 0.06 0.0008 Lead 0.97 0.0025 9.88 0.124 Rubidium BDL (<0.035) BDL (<0.00057) BDL (<0.035) BDL (<0.00057) Selenium 0.36 0.0009 39.19 0.494 Strontium 0.29 0.0008 0.06 0.0008 Thalium BDL (<0.18) BDL (<0.0005) BDL (<0.18) BDL (<0.0005) Zinc 45.3 0.118 23.46 0.295 Table D2. Stack discharge parameters - 2021 emission testing programme Source Electrowinning Stack Gold Room Furnace Stack Stack Diameter (m) 0.2 0.755 Moisture Content (%) 2.4 1.8 Velocity (m/s) 26.7 9.2 Dry standard flowrate (Nm3/h) 2,604 12,669 Gas Temp (°C) 31.7 34.4
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