Tonkin & Taylor Ltd | Level 3, PwC Centre, 60 Cashel Street, West End, Christchurch 8013, New Zealand PO Box 13055, Christchurch 8141 P +64-3-363 2440 F +64-9-307 0265 E [email protected] 22 June 2022 Job No: 1017908.0000 Oceana Gold (New Zealand) Limited PO Box 190 Waihi Waihi 3610 Attention: Euan Leslie Dear Euan Waihi North Project - Technical Review of Air Quality Assessments 1 Introduction Oceana Gold (New Zealand) Limited (Oceana Gold) is seeking consent for a several activities comprising its ‘Waihi North Project’ (WNP). Beca Limited (Beca) has been engaged by Oceana Gold to prepare three air quality assessments in relation to dust emissions from the mining activities and emissions to air from the Processing Plant as they relate to the Waihi North Project. Tonkin & Taylor Limited (T+T) has been engaged by Oceana Gold to undertake technical reviews of the air quality assessments prepared by Beca. The purpose of the technical review is to evaluate the appropriateness of the assessment approach, assessment criteria and whether the conclusions are reasonable. The following lists the reports that have been reviewed by T+T. Our technical review of each report is summarised in the corresponding sections below. • Waihi Facilities Report: Beca 2022a. Waihi North Project – Air Discharge Assessment – Waihi Facilities. WAI-985-000-REP-LC-0022. Report prepared by Beca Limited for Oceana Gold (New Zealand) Limited. 2 June 2022. • Wharekirauponga Underground Mine – WUG Report: Beca 2022b. Waihi North Project – Air Discharge Assessment – Wharekirauponga Underground Mine. Report prepared by Beca Limited for Oceana Gold (New Zealand) Limited. 14 June 2022. • Processing Plant Report: Becca 2022c. Waihi North Project – Processing Plant Air Discharge Assessment. Report prepared by Beca Limited for Oceana Gold (New Zealand) Limited. This letter report has been prepared in accordance with our letter of engagement dated 16 June 2021. It has been produced for New Zealand consenting purposes only. Information contained herein must not be relied on for investment purposes.
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