GHD | Oceana Gold NZ Ltd | 12552081 | Geochemical Assessment Wharekirauponga Underground Mine (WAI985-000-REP-LC-0013) 16 Parameter WUG Mine Mean Concentration in Earth’s Crust 1 Geochemical Abundance Index2 Martha Material Abundance Index2/5 n Arithmetic Mean Median Minimum Maximum Chromium 9,495 9.62 8.00 1.00 130 100 0 0 Copper 14,736 9.08 5.26 0.02 460 50 0 0-3 Lead 14,773 10.9 10.2 0.50 1,230 14 0 0-1 Mercury 10,894 0.19 0.06 0.01 18.7 0.05 1 0-3 Manganese 10,894 0.05 0.03 0.02 0.99 950 0 0 Molybdenum 10,894 2.46 1.90 0.10 48.1 1.5 0 0-1 Nickel 10,894 2.21 1.50 0.20 74.5 80 0 0 Selenium 10,894 0.63 0.50 0.50 12.0 0.05 3 4-6 Vanadium 9,495 11.4 8.00 0.25 135 160 0 0 Zinc 14,773 25.1 25.0 5.00 510 75 0 0 Notes: Units are in mg/kg unless stated otherwise Arithmetic Mean (and lower bound range) assumes values reported at analytical detection limit are equal to analytical detection limit Bold - Concentrations exceed the mean value for the Earth’s crust Red - Geochemical Abundance Indices of 3 or greater - No data or number of points insufficient to generate a meaningful value 1. Bowen, HJM, 1979, Environmental Geochemistry of the Elements. 2. Geochemical Abundance Indices - The Gardguide version 1.0 - National Institute of Acid Prevention. 3. Values based on Total Carbon. Where Total Carbon data is unavailable, a Total Carbon value of 0.1 mg/kg was applied. 4. Trace element sample analysis was undertaken using 4-acid digestion method which is likely to result in given concentrations of volatile elements (such as mercury) being underrepresented 5. Based on Project Martha Geochemical Assessment, AECOM, 2018 and Waihi North Project Geochemical Assessment, AECOM, 2022.
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