GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 14 . 1.2 Purpose of this report The NRS, Gladstone, TSF3 and WRS project components have each been the subject of various technical studies. This assessment focuses specifically on the individual hydrogeological, discharge quality and receiving environment water quality aspects of these four components. This report is provided as a supporting appendix to the Mitchell Daysh AEE. The following reports are required to be read in conjunction with this groundwater assessment, particularly where referenced throughout this document: Table 1.1 Key reference documents Key assessment description Report Title and Reference Surface water cumulative effects assessment: Management of minewater and the cumulative effects on the Ohinemuri River from all components of the WNP have been addressed in the Water Management Report. The outputs of the discharge quality analyses provided in Sections 3 - 6 are included in this report. GHD, 2022a: Waihi North Project Water Management Studies (WAI-985000-REP-LC-0011_RevE.1) Waihi North Project - Tunnel Elements: Assessment of groundwater effects from the Wharekirauponga dual tunnel alignment. GWS, 2022a. Waihi North Project. Assessment of Groundwater Effects – Tunnel Elements. (WAI-985-000-REP-LC-0040_RevA.4) Wharekirauponga Deposit: Assessment of groundwater effects form the Wharekirauponga underground mine. GWS, 2022b: Assessment of dewatering effects - Draft dated 6 June 2022 (WAI-985-REP-LC-0030). Tunnel Elements Assessment of groundwater effects from the Wharekirauponga tunnel. GWS, 2022b. Waihi North Project. Assessment of Groundwater Effects – Tunnel Elements. (WAI-985-000-REP-LC-0040_RevA.4) Geochemical Assessment Wharekirauponga underground mine Geochemical assessment of the proposed Wharekirauponga underground mine. GHD, 2022b: Geochemical Assessment Wharekirauponga Underground Mine (WAI-985-000-REP-LC-0013_RevD.1) Gladstone pit TSF design and civil engineering-related effects: Technical report prepared for resource consent, including GOP TSF design for the assessment of environmental effects GHD, 2022c: Gladstone Pit TSF Design Report (WAI-985-000-REP-LC0010_Rev E). Gladstone Wetland Assessment Summary: Technical memorandum summarising the assessment of effects on the Gladstone Wetland as a result of the proposed Gladstone Open Pit and development as a Tailings Storage Facility. GHD, 2022d: Gladstone Wetland Groundwater Assessment Summary Technical Memorandum. Rev B. Mataura Wetland Assessment: Technical memorandum presenting the assessment of effects on the Mataura Wetland as a result of the development of the Willows Rock Stack. GHD, 2022e: Mataura Wetland Assessment Technical Memorandum. Rev B. NRS design and civil engineering-related effects: Technical report prepared for resource consent, including NRS design for the assessment of environmental effects EGL, 2021a: Tailings storage and rock disposal – Volume 4. Northern Rock Stack RL173 – Proposed rock disposal facility – Technical Report (WAI-985-000-REP-LC-0006_RevC) Wharekirauponga design and geotechnical report: Assessment to characterise site conditions and includes WRS design. Golder/WSP, 2022a: Oceana Gold Waihi North Project – Wharekirauponga Underground Mine Willows Rock Stack and Surface Facilities Geotechnical Assessment (WAI-985-000-REP-LC0037_RevB)
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