Supporting Technical Assessments

Oceana Gold Waihi North Project Waihi North Project Geochemical Assessment – Geochemistry of Tailings and Overburden, Treatment and Mitigation Revision 0 – 17-Jun-2022 Prepared for – Oceana Gold (New Zealand) Limited – Co No.: 2274246 i AECOM Glossary AMD Acid and Metalliferous Drainage ANC Acid Neutralising Capacity AP Acid Potential GAI Geochemical Abundance Index GARD Global Acid Rock Drainage GOP Gladstone Open Pit GSGR Global Sulphate Generation Rates HFO Hydrous Ferric Oxide INAP International Network for Acid Prevention LOM Life of mine plan MOP4 Martha Open Pit Phase 4 MPA Maximum Potential Acidity MTPA Million Tonnes Per Annum MUG Martha Underground Mine including the Rex Vein NAF Non-Acid Forming NAG Net Acid Generating NAPP Net Acid Producing Potential NP Neutralising Potential NPR Net Potential Ratio NRS Northern Rock Stack PAF Potentially Acid Forming PTEL Potential for Trace Element Leaching RTSA Rock and Tailings Storage Area SGR Sulphate Generation Rates SPLP Synthetic Precipitation Leaching Procedure TSF Tailings Storage Facility UCL Upper Confidence Limit WNP Waihi North Project WRS Willow Road Stack WUG Wharekirauponga Underground Mine

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