3 Tonkin & Taylor Ltd Wharekirauponga Underground Mine – unplanned detonation air quality assessment Oceana Gold New Zealand Limited June 2022 Job No: 1015212.2000 vRev0 Table 2.1: Description of surface connections (adapted from GSS, 2021) Site ID2 Zone Description Shortest path to WUG magazine Site 1 – Waihi Portal Martha Mineral The portal for receipt of the ore for processing at the nearby processing plant. This is within OGNZL’s industrial site and is not accessible to the public. Approximately 10 km southeast of the WUG. Site 2 – Willows Portal Rural The main access portal to the mine consists of a large horizontal type decline that is used as the main entry/ exit route. To the WUG Approximately 7 km southeast of the WUG. Site 3 – Willows Rd Farm Fresh Air Intake Rural This fresh air intake connection is location within OGNZL owned land at the northern end of the Willows Road site. Approximately 6 km from the WUG. Site 4 – WUG Rise #1 Conservation (Indigenous Forest) The three WUG Rise connections are located within the HDC paper road boundary in a remote forested area. This road is not maintained as a public walkway. However, each proposed location will consist of a 10 m x 10 m area with a perimeter fence restricting access to members of the public. The nearest public walkway terminates at a swing bridge approximately 1 km from the northernmost vent. Rise #1 and Rise #3 are fresh air intakes, only Rise #2 will exhaust air when the mine’s ventilation system is operational. Approximately 0.9 km from the WUG Class 1 store. Site 5 – WUG Rise #2 Conservation (Indigenous Forest) Approximately 0.6 km from the WUG Class 1 store. Site 6 – WUG Rise #3 Conservation (Indigenous Forest) Approximately 0.7 km from the WUG Class 1 store. 2.2 Site surroundings and sensitivity Two of the surface connections are on OGNZL owned land at Willows Road, and three are located within the Coromandel Forest Park along a paper road. These three are closest to the underground store and are expected to be at the highest risk of impacts from discharges to air from the mine. The surface connections in the Coromandel Forest Park are all either air exhausts or intakes, an example of which is included as Figure 2.2 below. The location of each surface connection will be securely fenced off (typical dimensions 10 m x 10 m square) to exclude members of the public from close proximity to the shaft. 2 Site numbering differs from those provided in the location assessment prepared by GSS in 2021, as the Waihi Portal has been included as Site 1.
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