www.valenza-engineering.com 381_R_04_Rev 0 OGNZL_WUG_Phase1_Conceptual_Mitigation 1 1. INTRODUCTION OGNZL, a subsidiary of OceanaGold Corporation, is developing the Wharekirauponga Underground Project (WUG) consisting of Wharekirauponga Underground Mine and associated access infrastructure. The WUG is located 10km north of Waihi township, 150km southeast of Auckland, beneath Crown Land administered by the Department of Conservation (DOC) as the Coromandel Forest Park (CFP). The project is currently operated under NZPAM CMA exploration permit EP 4059 which allows for exploration activities including surface drilling. Valenza Engineering Pty Ltd (VE) has been tasked by OGNZL to complete an assessment of underground engineered mitigation measures to avoid any impact on surface water systems. This scope includes the analysis of the information collated to date by OGNZL and other parties, the development of conceptual mitigation factors (pre-drilling strategy, monitoring, grouting patterns, advised mining methods, dewatering and groundwater control strategies) and provision of advice on the data requirements. Appropriate suggestions for further groundwater installation, monitoring, and testing programs for the immediate consenting process and for the operational consent compliance have been developed with the other consultants involved.
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