Oceana Gold Waihi North Project Waihi North Project Geochemical Assessment – Geochemistry of Tailings and Overburden, Treatment and Mitigation Revision 0 – 17-Jun-2022 Prepared for – Oceana Gold (New Zealand) Limited – Co No.: 2274246 2 AECOM 1.1 Background The Waihi North Mine project elements are presented on Figure 1 and discussed in the following subsections. Figure 1 Waihi North Project Elements 1.1.1 The Gladstone Open Pit Mining of GOP is expected to occur over a six year period, in order to extract an estimated 2.6 Mt of ore and 18.7 Mt of rock. Rock material will be stored at the stockpile areas adjacent to the existing TSFs, then at the NRS, before being used for the construction of the TSF3 starter embankment. A portion (approximately 5.0 Mt) of the rock will be utilised as pit backfill material, before the GOP void is converted to a TSF. 1.1.2 Wharekirauponga Underground Mine The WUG is a new underground mine approximately 10 km north of Waihi town. The development of the mine will require the construction of supporting surface infrastructure and a tunnelling system. The dual tunnel access portal will be at Willows Road farm to serve as the initial access portal, with an access portal near the Processing Plant developed later to transport ore out of the mine and backfilling material into the mine once the WRS is exhausted. For this assessment the Dual Tunnels and WUG Mine are being treated as distinct entities as follows: • WUG Access Tunnel – From Willows Road Farm to the Wharekirauponga Orebody • WUG Mine – T-Stream and East-Graben-Vein (EG-Vein) orebodies
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