| | Waihi North Project Air Discharge Assessment - Waihi Surface Facilities | 4396626-1331619777-99 | 16/06/2022 | 2 Contents Executive Summary ................................................................................................ 4 1 Introduction........................................................................................................ 5 1.1 Overview.......................................................................................................................................... 5 1.2 Purpose of Report............................................................................................................................ 7 1.3 Limitations........................................................................................................................................ 7 2 Project Description............................................................................................ 8 2.1 Overview.......................................................................................................................................... 8 2.2 Gladstone Open Pit ......................................................................................................................... 9 2.3 Rock and Tailings Storage............................................................................................................. 11 2.4 Processing Plant ............................................................................................................................ 14 3 Discharges to Air and Associated Mitigation Methods ............................... 18 3.1 Overview........................................................................................................................................ 18 3.2 Dust from Surface Sources............................................................................................................ 18 3.3 Products of Combustion ................................................................................................................ 23 3.4 Emissions from Blasting on the Surface........................................................................................ 23 3.5 Vegetation Removal ...................................................................................................................... 24 3.6 Processing Plant ............................................................................................................................ 24 4 Air Quality Standards and Guidelines ........................................................... 26 4.1 National Environmental Standards and Guidelines for Ambient Air Quality.................................. 26 4.2 Dust Guidelines ............................................................................................................................. 28 4.3 Resource Consent Trigger Values ................................................................................................ 28 5 Environmental Setting..................................................................................... 30 5.1 Overview........................................................................................................................................ 30 5.2 General Features of the Receiving Environment........................................................................... 30 5.3 Gladstone Open Pit ....................................................................................................................... 35 5.4 Processing Plant ............................................................................................................................ 36 5.5 TSF3 and Associated Stockpiles ................................................................................................... 37 5.6 Northern Rock Stack and Associated Stockpiles .......................................................................... 37 6 Existing Air Quality Effects............................................................................. 39 6.1 Potential for Dust to Cause Adverse Effects ................................................................................. 39 6.2 OGNZL Air Quality Monitoring Programme ................................................................................... 40 6.3 PM2.5 .............................................................................................................................................. 52 6.4 Complaints and Compliance History ............................................................................................. 53 6.5 Summary of Current and Past Effects ........................................................................................... 55 7 Potential Effects on the Environment of WNP.............................................. 57 7.1 Approach to Assessment of Dust Nuisance Effects ...................................................................... 57 7.2 Effect of Separation Distances on Dust Concentrations ............................................................... 57 7.3 Sensitivity of the Receiving Environment ...................................................................................... 58 7.4 Potential Nuisance Effects of Deposited and Suspended Dust..................................................... 59
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