This document may not be reproduced in full or in part without the written consent of Marshall Day Acoustics Limited C:\Users\EthanGlover\Downloads\Rp 001 R0 20210601 SJP (Waihi North Noise Assessment) ISSUE.docx 6 of 79 1.0 INTRODUCTION Marshall Day Acoustics (MDA) has been engaged by Oceana Gold New Zealand Ltd (OGNZL) to assess noise associated with the proposed Waihi North Project (WNP). The project will have a timeline of approximately 13 years. The full details of the scope of the Project are contained in the Assessment of Environmental Effects prepared by OGNZL and Mitchell Daysh Ltd. The WNP includes the following five main components, as shown in Figure 1: • The Gladstone Complex which consists of three subcomponents: o A new pit to the south-west of the existing Processing Plant, known as the Gladstone Open Pit (GOP). o The later conversion of the GOP into a new Tailings Storage Facility (Gladstone TSF). o Upgrading of the Processing and Water Treatment Plants to increase throughput. • A new rock storage facility which will be established to the north of TSF2 – referred to as the Northern Rock Stack (NRS). • A new Portal (named “WUG Portal”) for the proposed materials handling tunnel connecting the Processing Plant to the Wharekirauponga Underground Mine. • A new tailings storage facility, known as TSF3, which will be established east of TSF1A; and • The newWharekirauponga Underground Mine (WUG) and associated surface infrastructure at Willows Road Farm. The existing planning framework and noise rules in relation to mining are complex. The rules are discussed in detail in Section 1.1 and noise criteria are proposed for the project in Section 4.0. This report comprises: • A review of the existing noise performance standards; • Details of the existing noise environment in Waihi; • A recommended set of noise criteria; • The findings of our noise calculations and assessment of noise effects for the proposed activities; • A comprehensive assessment of OGNZL’s overall noise emissions; and • Recommendations on appropriate noise control measures (mitigation) for the project. A glossary of acoustical terminology used is provided in Appendix A. Figure 1: Aerial view of project components and locality
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