Waihi Surface Explosives Principal Management Plan Approved by: General Manager Approval Date: 15/10/2017 Next Review: Archived OceanaGold Waihi Doc ID: WAI-350-PLN-003 Page 15 of 31 Any damaged or otherwise defective or unsatisfactory packages containing explosives are not stored in a magazine and that any explosives contained in such a package are immediately repacked in a sound and satisfactory package Where ammonium nitrate and diesel fuel are stored within close proximity of each other, the diesel fuel shall be stored at a lower level than the ammonium nitrate in such a way that the diesel cannot mix with the ammonium nitrate. The diesel storage area shall also be bunded Ammonium nitrate shall not be stored with any other flammable or combustible material other than the pallets they are delivered on The magazine shall be evacuated and secured during an electrical storm and not re-entered until 30 minutes after the last occurrence of thunder For more information on explosives storage facilities refer to the magazine and explosives storage procedures; see Appendix I for document details. 5.5 Damaged or Deteriorated Explosives Any explosives that are damaged, out of date, leaking, exuding or otherwise defective or deteriorated, are immediately destroyed and disposed of in a manner as described in A.S. 2187-2-2006 ‘Explosives – Storage and Use’ as a minimum standard or where the manufacturers advice exceeds that standard, according to the manufacturers advice. Bins are provided in the magazines for defective explosives as identified above. Segregation rules apply as per normal explosives and detonators. Where safe and practical, unsafe packaged explosives and detonators are to be disposed of in the next appropriate blast. ANFO is to be disposed of by dissolving with water. The destruction of all explosives shall be under the supervision of the Drill and Blast Supervisor or his delegate. Where the quantity of explosives to be disposed of is excessive (>10 kilograms packaged product), they are to be stored and returned to the supplier for disposal. For more information on damaged or deteriorated explosives refer to the procedures for use and handling of explosives; see Appendix I for document details. 5.6 Inspections and Stocktake A magazine stock register shall be kept in each magazine and all explosive movements both in and out of the magazine shall be recorded by the appointed Magazine Keeper or the nominated Approved Handler. The Magazine Keeper will perform regular stock takes to ensure the balance of items listed in the magazine stock register is correct. If discrepancies are found the Drill and Blast Supervisor and Site Service Manager will be notified immediately and the Explosive Loss Management procedure followed. A regular check of the magazine and surrounding area should be completed by two people with at least one being an approved handler. This shall include a full magazine stock take and an inspection of the magazine interior/exterior, compound, and fencing to ensure compliance with all relevant procedures and legislative requirements. A signed checklist (Magazine Explosive Safety and Environmental Audit) detailing the above stock take and inspection shall be completed. The Drill & Blast Supervisor is responsible for ensuring all corrective actions are followed up and completed on time. Monthly management inspections include inspection of the surface magazine. For more information refer to the procedure for explosives storage and magazines; see Appendix I for document details.
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