GHD | Oceana Gold NZ Ltd | 12552081 | Geochemical Assessment Wharekirauponga Underground Mine (WAI985-000-REP-LC-0013) iv Figure index Figure 1 Overview of the WUG components showing the Willows Road Portal area and the Wharekirauponga orebodies in relation to the current OceanaGold facilities at Waihi. 2 Figure 2 Willows Road Farm Portal Area and Associated Surface Facilities Area 3 Figure 3 Map showing location of drill core in relation to Willows Access Tunnel alignment 9 Figure 4 Cross section showing location of core and its daughter holes following the Willows Access Tunnel alignment 9 Figure 5 Map showing the drillhole distribution within the T-Stream and EG-Veins 10 Figure 6 Box plot showing the concentration ranges of arsenic in spoil material 17 Figure 7 Box plot showing the concentration ranges of iron in spoil material 17 Figure 8 Box plot showing the concentration ranges of selenium in spoil material 18 Figure 9 Box plot showing the concentration ranges of antimony in spoil material 18 Figure 10 Cross-sectional View displaying Arsenic Concentrations for the EG-Vein (right) and T-Stream (left) Orebodies 19 Figure 11 Cross-sectional View displaying Antimony Concentrations for the EG-Vein (right) and T-Stream (left) Orebodies 19 Figure 12 Cross-sectional View displaying Selenium Concentrations for the EG-Vein (right) and T-Stream (left) Orebodies 20 Figure 13 Box plot showing the concentration ranges of sulphur in spoil material 20 Figure 14 Box plot showing the acid neutralising capacity in spoil material 21 Figure 15 Cross-sectional View displaying Sulphur Concentrations for the EG-Vein (right) and T-Stream (left) Orebodies 21 Figure 16 NPR/NAH pH Diagram for WUG Mine and Willows Access Tunnel 22 Figure 17 Visual comparison between selected core samples utilised for column testing 23 Figure 18 WRS and Collection Pond Outline 24 Figure 19 WRS Development 24 Figure 20 Column sulphate / arsenic leachate relationship 28 Appendices Appendix A Conceptual Geological Model –Access Tunnel Alignment Appendix B Column Testing and Specification Appendix C Column Leachate Results
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