GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 74 Frequency Site Parameters Ohinemuri River (at location OH5 for discharges at point E1, and location OH6 for discharge at point E2) Selenium, Antimony Monthly Ohinemuri River (at locations OH5 and OH6) Cyanide (WAD), copper, iron, manganese, suspended solids, ammoniacal N, silver, TSS, nickel, zinc, arsenic, mercury, cadmium, chromium (VI), lead, hardness, sulphate Annual WTP Discharge Cobalt In addition, OCGNZL currently holds WRC RC no. 971323 to discharge water from the tailing ponds following rehabilitation into an unnamed tributary of the Ohinemuri River. It is recommended that conditions of this consent be applied to discharge water from TSF3 and GOP TSF following rehabilitation. Mataura Stream It is recommended flow and water quality monitoring be undertaken at location MS1 and flow and water quality monitoring at location MS2 for the Waihi North Project as outlined in Table 18. Table 18 Mataura Stream Monitoring (recommeded) Frequency Site Parameters Continuously MS1 Water level, turbidity, conductivity, pH, temperature Monthly MS1 / MS2 Copper, iron, manganese, suspended solids, ammoniacal N, silver, nickel, zinc, arsenic, mercury, cadmium, chromium (VI), lead, total suspended solids, sulphate Wharekirauonga Stream Recommendations for flow monitoring within the Wharekirauponga catchment are outlined in Appendix B and summarized in Table 19. There is no proposed surface water discharge from the Waihi North Project into the Wharekirauponga catchment. It is however recommended that surface water sampling be undertaken to coincide with manual flow gauging events on a quarterly basis throughout the project as outlined in Table 19. Table 19 Wharekirauponga Stream Monitoring (recommeded) Frequency Site Parameters Continously WKP01 / WKP02 / WKP03 / T-Stream East / T-Stream West / #A (North Trib) / #B (South Trib) / #C (Edmonds) / #D (Trib R) ) / #E (Thompson) Water Level Quarterly T-Stream West / WKP02 / WKP01 Conductivity, pH, turbidity, temperature, copper, iron, manganese, suspended solids, ammoniacal N, silver, nickel, zinc, arsenic, mercury, cadmium, chromium (VI), lead, total suspended solids, sulphate
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