| Executive Summary | WNP – Air Discharge Assessment - Wharekirauponga Underground Mine -t| 4397169-66885702-23 | |2 7 Potential Effects of Project on Environment ................................................ 39 7.1 Potential Adverse Effects of Discharges to Air .............................................................................. 39 7.2 Approach to Assessment of Effects............................................................................................... 39 7.3 Sensitivity of Receiving Environment ............................................................................................ 40 7.4 Potential Range of Effects of Dust................................................................................................. 40 7.5 Consideration of FIDOL Factors .................................................................................................... 42 7.6 Potential Nuisance Effects of Deposited and Suspended Dust..................................................... 43 7.7 Potential Health Effects ................................................................................................................. 46 7.8 Potential Effects on Ecology .......................................................................................................... 48 7.9 Potential Cumulative Effects.......................................................................................................... 49 7.10 Summary of Potential Effects ........................................................................................................ 49 8 Proposed Mitigation and Monitoring ............................................................. 50 8.1 Current Mitigation Measures used by OGNZL .............................................................................. 50 8.2 Monitoring Programme .................................................................................................................. 50 8.3 Weather and TSP Monitoring, Triggers and Actions ..................................................................... 50 9 Conclusions ..................................................................................................... 53 Figures Figure 1-1 Overview of Waihi North Project (Source: OGNZL)......................................................................... 8 Figure 2-1 Plan of surface infrastructure at Willows Road site ....................................................................... 12 Figure 2-2 Example tunnel portal (Source: OGNZL) ....................................................................................... 14 Figure 2-3 3D View of Willows Road site rock storage and runoff collection ponds (Source: OGNZL).......... 15 Figure 2-4 Tunnel alignment and potential ventilation shaft locations (Source: OGNZL) ............................... 16 Figure 2-5 Typical air vent ............................................................................................................................... 17 Figure 3-1 Project location and land ownership (Source: OGNZL) ................................................................. 20 Figure 3-2 Boundaries of the Waihi Airshed (shown as a blue shade area) ................................................... 22 Figure 3-3 Windrose showing hourly average wind speed and directions at OGNZL Barry Road Climate Station 1 January 2013 to 31 December 2019 (data supplied by OGNZL)..................................................... 24 Figure 3-4 Windrose showing winds >5m/s at OGNZL Barry Road Climate Station 1 January 2013 to 31 December 2019 (data supplied by OGNZL). ................................................................................................... 25 Figure 3-5 Monthly average rainfall at Waihi (January 2013 – December 2020) (mm) .................................. 26 Figure 3-6 Average number of rain days per month measured at Waihi (January 2013 to December 2020) 26 Figure 6-1 Locations of current air quality and meteorological monitoring sites around Waihi Mine (Source: OGNZL) ........................................................................................................................................................... 35
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