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 15 of 27 6.2 Production Charging 6.2.1 Authorised Charging Plans Due to vibration control measures required at Waihi Underground Operations, production blasts must be in accordance with an Authorised Charging Plan (ACP) to ensure compliance with mining consents. Any significant alteration to this plan will require a separate ACP to be created. ACP details include: • Location of blast • Number of holes • Charge and hole length • Timing configuration • Maximum charge weight per delay • Maximum charge weight not to be exceeded • Total initiation time Charge plans are signed off by a Production Engineer and when possible, peer reviewed by another Mining Engineer or the Senior Engineer. 6.2.2 Charging Procedures Before any work commences a workplace inspection and a Stop & Think must be conducted, all machinery must be pre-started, and any non-conformances must be reported to the Shift Supervisor immediately. If it any time there is excessive ground noise or fretting around a stope area, stop work, barricade the area and report it to the Shift Supervisor immediately. Where a stope is to be charged from the lower level, a sufficient bund must be in place before work can commence as per the Working around underground openings PHMP. Where applicable fall arrest gear must be worn and all relevant working at heights procedures followed. 6.2.3 Signs The appropriate signs must be hung during charging activities and include “Danger - Charging in Progress”, “Danger - Open Stope Above/Below”, and “No Unauthorised Entry”. When charging is complete a “Danger – Charged Face” must be hung across the drive. No one can proceed past this sign without permission from the Shotfirer or Shift Supervisor. For full details regarding production charging refer to the underground procedures for production charging and working around openings PHMP; see Appendix I for document details. 6.3 Development Charging 6.3.1 Development Design No development (i.e. drilling and charging) is to be carried without a survey memo or similar document issued from the survey department. The survey department must not issue a development memo without having a fully approved plan in their possession. These plans include details of development dimensions, names and gradient, geological structures, approximate diamond drill hole locations and any hazards these may pose, coordinates of drive end points, ground support instructions, stripping instructions, stop instructions, existing voids, planned break throughs and probe drilling instructions. Survey memos for drives under geological control may not include all of the aforementioned details. For more information refer to the underground procedure for development design approval; see Appendix I for document details. 6.3.2 Charging Procedures Before any work commences a workplace inspection and a Stop & Think must be conducted, all machinery must be pre-started, and any non-conformances must be reported to the Shift Supervisor immediately. If it any time there is excessive ground noise around the heading, stop work, barricade the area and report it to the Shift Supervisor immediately.
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