Tonkin & Taylor Ltd Assessment of mine vent air quality impacts to inform an assessment of ecological effects on Archey’s frog Oceana Gold (NZ) Limited June 2022 Job No: 1017908 Table of contents 1 Introduction 1 2 Nature of discharges to air from the vents 1 3 Approach 3 3.1 Overview 3 3.2 Dispersion modelling 3 3.3 Background air quality 4 3.4 Human health assessment criteria 5 4 Model results 5 4.1 Particulate matter 5 4.2 Nitrogen dioxide 5 5 Comparison with air quality near unpaved public roads 6 6 Conclusion 7 7 Applicability 8 Appendix A : CALMET and CALPUFF configuration Appendix B : Contour plots
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