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 19 of 31 6.7 Other Explosives Use There shall be specific JHAs developed for all other uses of explosives not covered in procedures. These JHAs shall be created using risk assessments conducted by relevant site personnel and, when applicable, the explosives supplier. The JHA will give consideration to the following: The storage and transport of explosives Training and competency requirements Specific explosive types Guarding/barricade requirements Environmental effects (vibration, noise etc) Infrastructure location and public access Firing instructions Emergency instructions including misfires 6.8 Atmospheric Electrical Activity Personnel working on excavators, cranes, drill rigs or in the process of loading shot holes should observe the following precautions at the discretion and direction of the Shift Supervisor: In accordance with AS-2182-2-2006 Explosive Storage and Use all work shall be reviewed and stopped and personnel withdrawn when thunder is heard. If the time interval is less than four seconds (corresponding to a distance of less than 1.5 kilometres), there is an immediate danger of lightning striking nearby and personnel should seek a less exposed position. Specific requirements include but are not limited to: Plant/crane operators are to lower the boom or jib of their equipment and remain inside the cab of the machine. Where practicable, attempt to earth the machine by tracking into damp ground Blasting crews are to stop work immediately, make the area safe and send the explosives truck to a location well clear of the shot site if safe to do so. The blasting crew are to seek cover inside the cab of the support vehicle, persons working in the magazine should evacuate immediately after securing the magazine facilities Personnel who are working in an outside environment without a vehicle nearby should: o Seek shelter in a substantial building with at least normal headroom or completely within a metal-bodied vehicle. Conventional fabric tents or tarpaulins offer no protection, small sheds offer uncertain protection o If on open ground remote from shelter, crouch down, singly, with feet together (keeping a low profile). A layer of any non-absorbing material, such as a plastic sheet, offers some protection against ground currents should there be a nearby flash Avoid high ground and isolated trees. If the vicinity of a tree cannot be avoided, seek a position just beyond the spread of the foliage Avoid touching or standing close to tall metal structures, wire fences and above ground pipe work. However, it should be noted that earthing has usually been installed at all mine structural facilities Avoid standing near overhead power lines and poles (power line corridors) For more information refer to the procedure for atmospheric electrical disturbances; see Appendix I for document details. 6.9 Misfires A misfire is best defined as a charge or part of a charge which has failed to detonate or initiate. All misfires must be reported to the Drill and Blast Supervisor as soon as practicable. The location of all misfires will be picked-up by survey. All misfires must be recorded in the Misfire Log Book. Only under the direct supervision of the Drill and Blast Supervisor or his nominated Approved Handler shall a misfire be intentionally dug out in an attempt to make the area safe.
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