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 88 of 124 TAILINGS LINE SPILL PURPOSE • To provide guidelines for responding to a tailings line spill HAZARDS • Cyanide usually fatal if ingested, absorbed through the skin, dust enters eyes, or HCN gas inhaled • Environmental damage RISK ASSESSMENT • Moderate SITE EMERGENCY COORDINATOR • Area Manager RESPONSE TO HAZARDS • Do not risk life • Mobilise emergency response team if required • Keep area clear of bystanders EVACUATION • All non-emergency personnel to be kept clear of the area CONTAINMENT • Turn off pumps at source • If spill is not contained determine the extent of the spillage (a visual check) • Mobilise equipment to build bunds and contain spill if required • Prevent the flow from entering waterways, in particular the Ohinemuri River • Tailing slurries are to be cleaned up and disposed in tailings pond or pumped to mill SPECIAL EQUIPMENT • Skid steer loader and/or bobcat EMERGENCY ACTION POINTS • If involved ensure Site Emergency Co-ordinator is given requested support • Keep an emergency logsheet • Ensure mine management is advised of the emergency at first opportunity and kept up to date • Report to the Environmental Manager to coordinate any monitoring, reporting, any further clean up requirements. EMERGENCY CONTACTS • See general listing in appendix 5 for contact telephone numbers EXTERNAL RESOURCES • Nil
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