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 12 AECOM 4.3 Rock Acid Generating Potential 4.3.1 Static Testing Static testing provides a mass balance for the potential acid generating and neutralising minerals and reactions but does not account for the potential rate of reactions that can significantly influence whether rock will generate AMD. Summarised static data is presented Table 1 (proposed Gladstone), Table 2 (Martha) and Table 3 (Historical Rock samples from Trio, Favona, Correnso) and presented in boxplots Figure 3 to Figure 6. Raw data is also presented in Appendix B. Figure 3. Box plot showing calculated Acid Neutralising Capacity range in rock material Box plot shows from highest node to lowest node: maximum / 75%ile / Median / 25%ile / minimum concentrations. Data extending below 0% on the Y-axis are not shown.
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