As requested, EGL (Engineering Geology Limited) has undertaken a peer review of the Gladstone Pit TSF - Design Report prepared by GHD for resource consent application for the Waihi North Project. The peer review was at the request of Oceana Gold (New Zealand) Limited (OGNZL), with the intention of EGL presenting the evidence for GOP TSF as part of the tailings storage aspects of the resource consent application. This letter briefly summarises the peer review work undertaken for OGNZL. EGL has reviewed the reports summarised in Table 1. This included review of a pre-feasibility report prepared by GHD which covered many technical items which then lead into GHDs design and technical report for resource consent application. GHD has subsequently updated their technical report following review comments, with the updated report received being that dated 07 December 2021 (OGNZL reference WAI-985-000-REP-LC-0010_RevD). EGL is satisfied that the design concepts presented in report dated 07 December 2021 covers the relevant items for resource application. EGL has been provided the final copy of the report for the resource consent application listed in Table 2 and this is in general accordance with the previously reviewed reports. We recommend the report is also subject to legal and internal OGNZL review. Full detailed design is required before construction is undertaken and we recommend the detailed design is also peer reviewed. Your sincerely EGL Trevor Matuschka EGL Director CPEng EGL Ref: 9015 23 June 2022 Oceana Gold (New Zealand) Limited PO Box 190 Waihi Attention: Joshua Coleman Oceana Gold (New Zealand) Limited Peer Review of GOP TSF Resource Consent Technical Report
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