Supporting Technical Assessments

OPERATOR OceanaGold (New Zealand) Limited PROJECT Willows Road portal entrance site - Surface storage only LOCATION Willows Road, Waihi Ref. No. Substances on this site CAS No. Effect Type Hazard Rating Base Quantity Substance Form Distance to boundary less than 30 metres? YES NO Adjacent to water? YES NO Type of Activity A/Above B/Underground Use F1 F2 F3 Product of Adjustment Factors Adjusted Quantity A Specific gravity Volume (L) Proposed Quantity Fire/ Explosion Effect Ratio Human Health Effect Ratio Environment Effect Ratio 68334-30-5 Fire/Explosion Low 100 Liquid n a 1.0 3.0 1.0 3 300 0.85 80700 68.6 0.23 Human Health Low 30 1.0 1.0 1.0 1 30 2.29 Environment Medium 30 n 1.0 1.0 1.0 1 30 2.29 118-96-7 Fire/Explosion High 0.1 Powder n a 1.0 3.0 1.0 3 0.3 7.4 24.50 Human Health Medium 10 1.0 1.0 1.0 1 10 0.74 Environment Medium 30 n 1.0 1.0 1.0 1 30 0.25 78-11-5 Fire/Explosion High 0.1 Solid n a 1.0 3.0 1.0 3 0.3 0.01 0.03 7758-97-6 Human Health - - 13424-46-9 Environment - - n 6484-52-2 Fire/Explosion High 1 Liquid n a 1.0 3.0 1.0 3 3 40.8 13.60 Human Health - - Environment low 100 n 1.0 1.0 1.0 1 100 0.41 7632-00-0 Fire/Explosion - Liquid n a 8.0 Human Health Low 30 1.0 1.0 1.0 1 30 0.27 Environment Low 100 n 1.0 1.0 1.0 1 100 0.08 7782-44-7 Fire/Explosion High 10000 Gas n a 0.1 3.0 1.0 0.3 3000 60.0 0.02 Human Health Environment n 74-86-2 Fire/Explosion High 10000 Gas n a 0.1 3.0 1.0 0.3 3000 20.0 0.01 Human Health Environment n Total Effects Ratios 38.4 3.3 3.0 4 1 2 3 7 5 6 Diesel Initiating explosive/detonators Ammonium nitrate emulsion Booster/ANFO/ Packaged explosive Acetylene Gasser Oxygen Adjustment Factors B t or m3 P t or m3

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