7 Tonkin & Taylor Ltd Wharekirauponga Underground Mine – unplanned detonation air quality assessment Oceana Gold New Zealand Limited June 2022 Job No: 1015212.2000 vRev0 D R A F T Table 3.1: Emission parameters for the different ventilation scenarios Parameter Mechanical ventilation Natural ventilation All seasons Summer Winter Fan on 1. Fan off 2. Fan off Fan off Site 5 – Rise #2 Site 4 – Rise #1 Site 1 - Plant Portal Site 2 – Willows Portal Site 4 – Rise #1 Temperature (⁰C) 21.4 21.8 22.9 22.3 14.7 Pressure (hPa) 971 966 985 975 965 Velocity (m/s) 16.4 0.9 0.4 0.4 0.5 Volumetric flowrate (mᶟ/s) 387 17.4 9.5 10.6 10.6 Duration of release 15 minutes 40 seconds 13 hours 18 minutes 20 hours 7 minutes 20 hours 11 minutes 2 days 21 hours
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