GHD | Oceana Gold (New Zealand) Limited | 12537997 | Gladstone Pit TSF 4 1. Introduction 1.1 Background Oceana Gold (New Zealand) Limited (OGNZL) owns and operates the Waihi Gold Mine in Waihi, New Zealand. The current life of mine plan (LoMP) has production ending by the end of 2030. OGNZL has identified the Waihi North Project (WNP) as an opportunity to extend the life of mine. Broadly speaking, the WNP includes: – A new underground mine (Wharekirauponga Underground Mine - WUG) located approximately 11 km northwest of the current Processing Plant. – Mining of a new open pit near the existing Processing Plant, Gladstone Open Pit (GOP). – A new tailings storage facility designated TSF3. – New rock stack designated the Northern Rock Stack (NRS). The GOP will be converted to an in-pit tailings storage facility (TSF) upon completion of mining. This report outlines the design of the GOP TSF for the purpose of supporting the resource consent application for the WNP. Note, all coordinates and elevations used throughout this report are relative to the mine datum. 1.2 Purpose of this report The purpose of this report is to describe the design elements of the GOP TSF to support the resource consent application for the WNP. 1.3 Scope of works The design report includes the following: – Introduction – Background information – Project conditions – Summary of options considered – Basis of design – Design concepts and drawings – Design risks – Construction requirements – Operation requirements – Closure and rehabilitation 1.4 Limitations This report: has been prepared by GHD for Oceana Gold (New Zealand) Limited and may only be used and relied on by Oceana Gold (New Zealand) Limited for the purpose agreed between GHD and Oceana Gold (New Zealand) Limited as set out in Section 1.2 of this report. GHD otherwise disclaims responsibility to any person other than Oceana Gold (New Zealand) Limited 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.
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