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 78 of 124 LPG Initiate Emergency Procedures for all scenarios below. Tank or line fire / leak All scenarios are to be handled in the same way as outlined below. • Activate one of the Emergency Stop Buttons on the LPG Vessel and Vaporiser System called the Donkey Boiler. These are located by the Cyanide Mixing Shed – North West or North East corners. This isolates the complete LPG system including the Tank outlets.. • Open the 8” LPG Flood Valve for the LPG Tank deluge system. This is signposted and has a red handle. This is located on the corner of the access road to the Ball Mill parallel to CV05. If possible go past the Wooden Water Tanks and check: - Both Process Water Pumps are running To Contact Rockgas Emergency on 0800 574737 Evacuate the area. • Go to the South Assembly area. (North Assembly area is too close to the LPG Tanks). • Wardens to ensure guards are in place to prevent access to LPG Tanks and evacuate personnel further away if necessary. Other precautions: • Only attempt to isolate and set off the deluge system if you do not put yourself at risk from fire or explosion. • Advise the Fire Service and inform if the tanks are isolated or not and if on fire. • Keep clear of LPG tank ends (explosion hazard) Liquid Oxygen Leak • If possible, stop leak by shutting off valve upstream from leak • Contact Supervisor • Keep all personnel up wind and well clear of tank and lines • No smoking or naked flames permitted in area • Wear safety glasses and PVC gloves. When using large quantities or where heavy contamination is likely, wear coveralls. • Supervisor to contact BOC Gases NZ Ltd 0800 111 333 Liquid Carbon Dioxide Leak • If possible, stop leak by closing valve upstream from leak • Contact Supervisor • Keep personnel up wind and well clear of tank and lines • Supervisor to contact BOC Gases NZ Ltd 0800 111 333 Portable Gas Cylinders • Never attempt to close the valve on a leaking portable gas cylinder, allow the cylinder to discharge itself • If leaking cylinder is in an enclosed space, vacate space immediately and ventilate when possible • Keep personnel up wind and well clear of cylinder • No smoking or naked flames permitted in area • Report leak to your Supervisor
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