Oceana Gold Waihi North Project Waihi North Project Geochemical Assessment – Geochemistry of Tailings and Overburden, Treatment and Mitigation Revision 9 – 17-Jun-2022 Prepared for – Oceana Gold (New Zealand) Limited – Co No.: 2274246 10 AECOM A2.2.3 Statistical Analysis of Rock Geochemistry Rock geochemistry datasets for the proposed GOP were assessed using the WMW test (probability of sample population being equivalent) to determine whether significant variation exists between the following: • Rock chemistry at the proposed GOP relative to rock from historically mined areas; and • Proposed hydrothermal breccia rock relative to proposed andesitic rock (regardless of proposed source). Statistical WMW analyses were undertaken using ProUCL software (version 5.1) using a confidence coefficient of 95%. The datasets tested were sulphur, aluminium, iron, calcium, antimony, arsenic, barium, cadmium, cobalt, chromium, copper, lead, mercury, manganese, molybdenum, nickel, selenium, vanadium and zinc. Summarised results of the analyses are presented in Table 34 and box and whisker plots showing the relative distribution are provided in Figure 18 to Figure 23. Table 34 Summary of Wilcoxon Mann-Whitney Test Results Gladstone relative to historical Andesite relative to Breccia Total S Equivalent Elevated Al Depressed Elevated Fe Equivalent Elevated Ca Depressed Elevated Sb Elevated Depressed As Elevated Equivalent Ba Depressed Depressed Cd Elevated Depressed Co Depressed Elevated Cr Depressed Depressed Cu Depressed Elevated Pb Depressed Equivalent Hg Elevated Depressed Mn Depressed Depressed Mo Depressed Depressed Ni Depressed Elevated Se Depressed Depressed V Depressed Elevated Zn Depressed Elevated The Wilcoxon Mann-Whitney Test suggests the distribution and / range of the two data sets are different, however the means / median are similar. A non-significant p-value may therefore be a function of differing sample sizes.
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