Oceana Gold New Zeland Limited Hydrogeology Support for WKP Underground Updated Conceptual Model 1. INTRODUCTION .............................................................................................................................................. 1 1.1. Project Description...................................................................................................................................... 1 1.2. Project Understanding ................................................................................................................................ 1 1.3. Project Objectives ....................................................................................................................................... 2 2. DATA EVALUATION ....................................................................................................................................... 2 2.1. Packer Testing Data Analysis..................................................................................................................... 2 2.2. Estimation of static water table ................................................................................................................... 4 2.3. Data Evaluation .......................................................................................................................................... 5 2.4. Geologic model update............................................................................................................................... 5 3. RESULTS ......................................................................................................................................................... 6 3.1. Summary of Packer Testing Data............................................................................................................... 6 3.2. Piezometric levels ....................................................................................................................................... 9 4. UPDATED CONCEPTUAL MODEL .............................................................................................................. 15 4.1. Shallow Groundwater ............................................................................................................................... 15 4.2. Conceptualization of the EG Vein system and surrounding rocks ........................................................... 18 Test Holes WKP-102 and WKP-04D ............................................................................................................... 18 Test Holes WKP-101 and WKP-103................................................................................................................ 19 Test Hole WKP-105 ......................................................................................................................................... 21 Summary of conceptualization of the EG Vein system and surrounding rocks ............................................... 23 4.3. Conceptualization of the T-Stream Vein and surrounding rocks .............................................................. 24 Test Hole WKP-104 ......................................................................................................................................... 24 Test Hole WKP-03D......................................................................................................................................... 25 Summary of conceptualization of the T-Stream Vein and surrounding rocks ................................................. 26 4.4. Summary of Conceptualization................................................................................................................. 26 4.5. Data Gaps................................................................................................................................................. 27 5. REFERENCES ............................................................................................................................................... 28 Appendix A: Packer Testing Analyses Sheets.......................................................................................... 29 Appendix B: Hydrographs........................................................................................................................... 30
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