GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 4 1.2 Scope GHD was commissioned by OGNZL to deliver the following studies relating to site water management for the WNP: Water balance analysis – covering estimation of quantities and quality of water for the LOM requiring treatment; considered in relation to available site storage, treatment and discharge constraints. A key objective of this study is to assess whether additional water from the development of the new areas associated with the WNP including WUG, TSF3, NRS, WRS, GOP and GOP TSF, combined with the MOP4 cutback and deeper underground mining and dewatering at the existing MUG can be managed within existing physical and consent constraints, or whether additional treatment capacity and/or amended consent requirements need to be incorporated into the design. Provide baseline flow and water quality characterisation for the Mataura Stream and Wharekirauponga Stream catchment areas which have the potential to be impacted by the current proposed works. Investigate the cumulative effect on the receiving water quality in the Ohinemuri River and other potentially impacted catchments. This report also provides an overview of the current approach taken by OGNZL to site water management to provide context. 1.3 Limitations This report: has been prepared by GHD for Oceana Gold New Zealand Ltd. and may only be used and relied on by Oceana Gold New Zealand Ltd. for the purpose agreed between GHD and Oceana Gold New Zealand Ltd. as set out in section 1 of this report. GHD otherwise disclaims responsibility to any person other than Oceana Gold New Zealand Ltd. arising in connection with this report. GHD also excludes implied warranties and conditions, to the extent legally permissible. The services undertaken by GHD in connection with preparing this report were limited to those specifically detailed in the report and are subject to the scope limitations set out in the report. The opinions, conclusions and any recommendations in this report are based on conditions encountered and information reviewed at the date of preparation of the report. GHD has no responsibility or obligation to update this report to account for events or changes occurring subsequent to the date that the report was prepared. The opinions, conclusions and any recommendations in this report are based on assumptions made by GHD described throughout this report and in the appendices. GHD disclaims liability arising from any of the assumptions being incorrect. GHD has prepared this report on the basis of information provided by Oceana Gold New Zealand Ltd. and others who provided information to GHD (including Government authorities), which GHD has not independently verified or checked beyond the agreed scope of work. GHD does not accept liability in connection with such unverified information, including errors and omissions in the report which were caused by errors or omissions in that information. The opinions, conclusions and any recommendations in this report are based on information obtained from, and testing undertaken at or in connection with, specific sample points. Site conditions at other parts of the site may be different from the site conditions found at the specific sample points. Investigations undertaken in respect of this report are constrained by the particular site conditions, such as the location of buildings, services and vegetation. As a result, not all relevant site features and conditions may have been identified in this report. Site conditions (including the presence of hazardous
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