WAI-985-000-REP-LC-0056 Revision 0 Page 20 of 21 Waihi North Project – Tailings and Rock Storage – Functional Need Assessment 7 CONCLUSION To achieve the required tailings storage, rock supply, and rock storage requirements, the proposed TSF3, GOP and GOP TSF, NRS and WRS are essential components of the Waihi North Project. While multicriteria analysis has identified these features as the preferred means of achieving their respective tailings or rock storage purposes (refer EGL (2022) and WSP (2022)), all result in the unavoidable loss of river extent and values. This assessment has further evaluated the feasibility of alternative tailings and rock storage options that avoid the loss of river extent and values and find them to be unfeasible for the Waihi North Project. In summary, there are no other legally or technically available options which would maintain the viability of the Waihi North Project whilst: • Allowing access to the GOP orebody in a manner that avoid the loss of the upper portion of Gladstone Stream; • Providing for the disposal of 8.66M tonnes of tailings in a manner that avoids the loss of part of and tributaries of the Ruahorehore Stream; • Providing for storage to manage the 18.7M tonnes of surplus material to effectively construct TSF3, GOP TSF and backfill the underground in a manner that avoids placing material over part of TB1 Stream . • Providing for the effective temporary storage of approximately 2M tonnes of rock suitable for backfilling WUG in a manner that avoids placing rock over part of Tributary 2 upstream from the confluence with Mataura Stream. Considering the above discussions, OGNZL conclude that TSF3, GOP and GOP TSF, NRS and WRS, are integral components of the Waihi North Project and have a functional need to be located in the respective environments in which they are proposed.
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