May 12, 2022 To Mark Burroughs, Euan Leslie (Oceana Gold) Contact No. Copy to Ian Jenkins (AECOM) Email [email protected] From Tim Mulliner Project No. 12552081 Project Name Waihi North Project Subject Wharekirauponga Column Summary 1. Introduction This technical memorandum summarises laboratory analytical acid base accounting (ABA), whole rock geochemistry and leachate data from field columns set up consisting of representative waste rock material associated with the Wharekirauponga Ore Body. The column set up methodology is provided in Appendix A of this document. 2. Column Set up Analysis Representative sub-samples of the mixed and crushed column material were assessed using multi-element and acid base accounting (ABA) accounting. The collated data is summarised in Table 2.1 and the laboratory data is provided in Appendix B. In addition, particle size distribution (PSD) analysis was undertaken on the columns. This data is provided in Appendix C. Before placement in each column, material was weighed so that the total weight of the material in the column was known. This data is summarised and presented in Table 2.2. Table 2.1 Column Weights T-Stream EG-South EG-North Volume of Waste in Column (kg) 63.506 70.106 80.442
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