WAI-985-000-REP-LC-0056 Revision 0 Page 5 of 21 Waihi North Project – Tailings and Rock Storage – Functional Need Assessment The above facilities involve discharges to land and the Resource Management Act 1991 (“RMA”) requires applicants to justify the reasons for the proposed choice and the consideration of possible alternative methods of discharge, including discharge into any other receiving environment. Oceana Gold New Zealand (OGNZL) has considered the possible alternative options in selecting the preferred project components for tailings and rock storage. (Engineering geology Ltd (EGL) (2022) presents the options considered for tailings and rock storage in operation and closure in an options assessment. This assessment evaluates potential methods and sites, considering technical, environmental, socio-economic and project economics criteria, identifying the proposed TSF3, GOP TSF and NRS as the top option under a Multi Criteria Assessment (MCA). WSP (2022) presents an options assessment identifying the proposed WRS as the preferred option for managing surplus rock at Willows Farm during operation. The proposed facilities described above involve the unavoidable reclamation of waterbodies in several locations as follows: • TSF3 will consume several unnamed tributaries of Ruahorehore Stream; • The GOP and GOP TSF will consume the headwaters of the Gladstone Stream; • The NRS will consume part of a tributary to the Ohinemuri River known as TB1 Stream and various tributaries thereof; and • The WRS will consume part of a tributary of Mataura Stream known as Tributary 2. The location of these features is illustrated on Figure 2:
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