Waihi Underground Explosive Principal Hazard Management Plan Approved by: SSE/ General Manager Approval Date:11/05/2021 Next Review: 08/04/2022 OceanaGold Waihi Document ID: WAI-400-PLN-007 Page 4 of 27 6.3.3 SIGNS........................................................................................................................................................... 16 6.4 FIRING ......................................................................................................................................................... 16 6.4.2 DESIGNATED FIRING POSITIONS .................................................................................................................. 16 6.4.3 FIRING CABLE............................................................................................................................................... 16 6.4.4 FIRING PROCEDURE ..................................................................................................................................... 17 6.5 MAINTENANCE / SAFETY BLASTS ................................................................................................................. 17 6.6 RE-ENTRY AFTER FIRING .............................................................................................................................. 17 6.6.1 BLAST FUMES............................................................................................................................................... 17 6.6.2 RE-ENTRY PROCEDURE ................................................................................................................................ 17 6.6.2.1 RE-ENTRY AFTER MAINTENANCE / SAFETY BLASTS ...................................................................................... 17 6.6.3 TESTING BLAST FUME CLEARANCE TIMES .................................................................................................... 18 6.7 OTHER EXPLOSIVES USE............................................................................................................................... 18 6.8 ATMOSPHERIC ELECTRICAL ACTIVITY........................................................................................................... 18 6.9 MISFIRES...................................................................................................................................................... 18 7 CHARGING EQUIPMENT AND MAINTENANCE .............................................................................................. 18 7.1 CHARGING EQUIPMENT............................................................................................................................... 18 7.1.1 TRANSPORT ................................................................................................................................................. 18 7.1.2 CHARGING ................................................................................................................................................... 19 7.1.3 FIRING ......................................................................................................................................................... 19 7.2 MAINTENANCE ............................................................................................................................................ 19 7.2.1 SPECIAL PRECAUTIONS ................................................................................................................................ 19 7.2.2 INSPECTION AND TESTING........................................................................................................................... 19 7.2.3 PREVENTATIVE MAINTENANCE.................................................................................................................... 19 8 EMERGENCY PREPAREDNESS ....................................................................................................................... 20 9 AUDIT AND REVIEW..................................................................................................................................... 20 APPENDIX I – UNDERGROUND EXPLOSIVES PHMP SUPPORTING DOCUMENTS........................................................ 21 APPENDIX II – PRINCIPAL HAZARD MANAGEMENT PLAN RISK RANKING TABLES ..................................................... 23 APPENDIX III – RISK REGISTER .................................................................................................................................. 24 APPENDIX IV – CHECK LIST FOR ENSURING COMPLIANCE TO REGS .......................................................................... 27
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