Supporting Technical Assessments

GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 150 OGNZL, 2019. Dewatering and Settlement Monitoring Report. 2019. Document Reference: WAI-200-REP007-004. OGNZL, 2020. Tailings Storage Facility Annual Monitoring Report – Part D Groundwater. April 2019 – March 2020. Document Reference WAI-200-REP-005-03 OGNZL, 2021a. Waihi North proposed project overview – Wharekirauponga Underground Mine. https://www.waihinorth.info/, accessed 31/10/2021 OGNZL Leapfrog Model, 2021. Geological Model in Leapfrog Software. Updated June 2021. Opus, 2019. Oceana Gold – Quattro Baseline Hydrology. This reference includes reports for field visits dated: 24 January 2019; 7 & 8 February 2019; 21 February 2019; 6 & 7 March 2019; 20 & 21 March 2019; and 3 & 4 April 2019. Technical memorandums prepared for OGNZL. Opus File Ref. No. 3-53501.00 Theis, C.V., 1935. The relation between the lowering of the piezometric surface and the rate and duration of discharge of a well using groundwater storage, Am. Geophys. Union Trans., vol. 16, pp. 519-524. URS, 2003. Favona underground mine. Assessment of Groundwater Issues. Prepared for Welcome Gold Mains Ltd. and Auag Resources Ltd. March 2003 Valenza Engineering. 2022. Wharekirauponga Underground Mine. Wharekirauponga Conceptual Mitigation Phase 1 Report. Prepared for Oceana Gold (New Zealand) Limited. Report no. 381_R_04_Rev D. June 2022. WRC, 1999. Resource Consent AUTH9731303.01.10. Discharge Permit. Issued by Waikato Regional Council, dated 13 October 1999. Doc # 566632 v6 WRC, 2021a. Waikato Regional Council Water Allocation calculator. Available at https://www.arcgis.com/apps/mapviewer/index.html?layers=586ebf3569354b83a93685c260755174&layerId =0. Website accessed 24 November 2021. WRC, 2021b. Groundwater availability. Website Groundwater availability | Waikato Regional Council, viewed 22 November 2021. WRC, 2021c. Waikato Regional Council Groundwater and surface water take request and registered bore request. Data received by email November 2021. WSP, 2021a. OGL – Mataura Stream Site Visit 21 September 2021. Technical memorandum provided to OGNZL, dated 23 September 2021. WSP, 2021b. OGL – Mataura Stream Flow Gaugings: Visit on 16 March 2021. Technical memorandum provided to OGNZL, dated 18 March 2021.

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