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 59 AECOM 9.0 References AECOM, 2008 Project Martha Geochemical Assessment. Geochemistry of Martha Phase 4 Pit, Martha Underground and Rex Orebody. 24 May 2018 Allison, J.D and Allison, T.L. 2005. Partition Coefficients for Metals in Surface Water, Soil and Waste. U.S. Environmental Protection Agency, Office of Research and Design. Ref: EPA/600?R-o5/074 July 2005. Browne, 2008. Distribution of Pathfinder Elements in Soils that Overlie the Favona Deposit, Waihi, New Zealand, and Implications for Exploration. Thesis submitted in fulfilment of the requirements for the Degree of Master of Science in Geology, The University of Auckland, February 2008. EGI, 1994 Environmental Geochemistry International Pty Ltd. Waihi Gold Mining Company. Acid forming characteristics of waste rock and tailings and implications for waste disposal. Stage 1 Report. March 1994 EGI, 2012a Environmental Geochemistry International Pty Ltd. Martha Mine. Column Leach Testing of Favona Tailings. Progress Report - Year 3. June 2012 EGI, 2012b Environmental Geochemistry International Pty Ltd. Martha Mine. Column Leach Testing of a composite tailings sample from storage 2: Progress Report Year 8. June 2012. GCNZ, 1986 Groundwater Consultants (NZ) Ltd. And Stuart D Miller & Associates Pty Ltd. Geochemical Evaluation of leachates from Waste Rock and Tailings. August 1986. GHD, 2019. Water Balance Report INAP, 2018 International Network for Acid Prevention. Global Acid Rock Drainage (GARD) Guide. 17 December 2018. http://www.gardguide.com URS, 2010. URS New Zealand Ltd. Trio Development Project - Geochemistry of Waste Rock. 08 June 2010 URS, 2001. URS New Zealand Ltd. Favona Reef, Waihi. Underground Mining Consent Geochemistry. 30 November 2001 URS, 2012. URS New Zealand Ltd. Correnso Underground Mine and Golden Link Project, Area - Geochemistry of Ore, Tailings and Waste Rock. 5 June 2012

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