Waihi Emergency Principal Control Plan Approved by: General Manager/SSE Approval Date: 26/03/2021 Next Review:26/03/2022 OceanaGold Waihi WAI-250-PLN-001 Page 82 of 124 Appendix O Cyanide Emergency Procedures CYANIDE FIRE PURPOSE To provide guidelines for responding to a fire in close proximity to cyanide HAZARDS Cyanide usually fatal if ingested, absorbed through the skin or HCN gas inhaled Burns from fire if trapped Smoke inhalation RISK ASSESSMENT High SITE EMERGENCY COORDINATOR • Area Manager (depending on availability) RESPONSE TO HAZARDS • Do not risk life • Mobilise fire brigade and emergency response team • Monitor area for HCN gas • Wear full face mask or self contained breathing apparatus • Wear full wet weather protective suit (rubber boots to be worn inside wet weather trousers and PVC gloves to be worn inside of wet weather jacket) • Keep area clear of bystanders • If possible restrict flow of cyanide • Isolate power in immediate area EVACUATION All non-emergency personnel to be moved to a muster point or area at least 200m upwind CONTAINMENT • Remain upwind of cyanide or spills and monitor for HCN gas • Water should not be used near quantities of solid cyanide as it can generate large amounts of HCN gas which is highly toxic and highly flammable • Water may be used to fight the fire when in close proximity to liquid cyanide, (note HCN can be evolved) • Dry chemical extinguishers can be used on small fires near cyanide • Construct a bund to contain contaminated water if necessary • Neutralise spill area with ferrous sulphate • Remove contaminated soil to tailings dam SPECIAL EQUIPMENT • Firefighting equipment • Breathing apparatus and full face respirator and appropriate filter • Ambulance with additional oxygen equipment on standby EMERGENCY ACTION POINTS • Ensure Site Emergency Co-ordinator is given requested support • Keep an emergency log sheet • Man incident command post at all times • Ensure mine management is advised of the emergency at first opportunity and kept up to date EMERGENCY CONTACTS See general listing in appendix 5 for contact telephone numbers EXTERNAL RESOURCES • National Poison Centre 0800 764 766 • Waihi Medical Centre 863 8195
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