GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 1 1 INTRODUCTION 1.1 Project Description The current Waihi life of mine (LOM) plan is to complete production by 2030. Study work conducted by Oceana Gold NZ Ltd. (OGNZL) has identified a new open pit and a new underground mining opportunity. The understanding of this opportunity has advanced to a point OGNZL is ready to lodge resource consent applications for its next project, the Waihi North Project (WNP), which comprises: A new underground mine, the Wharekirauponga Underground Mine (WUG), located approximately 11km north-west of the current processing plant under land administered by the Department of Conservation (DOC) (Coromandel Forest Park). Site infrastructure supporting the mine will be located within the Willows Surface Facilities Area (WSFA) on OGNZL-owned farmland located at the end of Willows Road, with only minimal surface features within the forest park, in the form of fenced vent raises on a legal road reserve owned by the Hauraki District Council; The mining of a new open pit near the existing processing plant, centred over Gladstone Hill, the Gladstone Open Pit (GOP). This pit will be converted to a tailings storage facility (GOP TSF) once mining is complete; A new tailings storage facility to the east of existing TSF1A, called TSF3; New rock stack (the Northern Rock Stack or NRS) at the Northern Stockpile area adjacent to the existing TSF2; New temporary rock stack (the Willows Rock Stack or WRS) adjacent the Wilows Access Tunnel Portal; Reconsenting of the existing water treatment plant (WTP) treated water discharge consent to cover the project timeframe; Upgrading of the existing WTP to double the water treatment capacity; Modifications to the existing overland and load out conveyors to allow rock loading and conveying to and from the NRS (return of rock to use for backfilling); and Upgrading of the existing Waihi processing plant to enable ore processing up to 2.25 million tonnes per annum (MTPA), up from 1.25 MTPA currently. The assessment assumes the following: Martha Underground (MUG) will run in parallel with the WNP; Martha Open Pit 4 (MOP4) will be mined in parallel with the WNP; Continued operation of the current treated water discharge regimes (A-E) (Resource Consent (RC): AUTH971318.01.13). It is assumed that this and any related consents are extended to cover the LOM period; TSF1A is constructed to a crest height of 182 mRL1; and TSF2 is constructed to a crest height of 160.7 mRL. The main components of the project as they relate to water management are outlined in Figure 1, Figure 2 and Figure 3. 1 Based on a pre-1949 geodetic datum that is approximately 2.5m lower than the current NZGD2000 datum. The datum is used across the existing Waihi mining facilities.
RkJQdWJsaXNoZXIy MjE2NDg3