Supporting Technical Assessments

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 10 of 31 3. HAZARD IDENTIFICATION The main risk to mining personnel regarding explosives is unplanned initiation; to the local community, the main risks are flyrock and exceeding maximum vibration levels stipulated in the OGNZL mining licence, consents and jeopardising the company’s licence to operate. In order to eliminate, and/or minimise these hazards as far as reasonably practicable, control measures for the following aspects of explosives use on site must be considered:  Explosives transport  Secure storage facilities  Deteriorated or damaged explosive products  Fire  Maintenance of explosives charging/transportation equipment  Operator/handler competency and training  Handling misfires  Emergency preparedness  Charging as per approved plans  Accidental initiation  Persons or equipment entering the blast area unauthorised  Theft  Flyrock  Explosives struck by lightning  Explosives expire while being stored on site The tools and processes used by OGNZL to manage explosives related risks include but are not limited to:  Compliance with applicable acts, regulations and standards  Standard operating procedures and management plans (including this PHMP) covering all aspects of explosives use, handling and transport  Operator/handler training and testing of competency in above procedures  Explosives equipment maintenance  Fire suppression systems  Risk assessments  Vibration Monitoring  Workplace inspections  Management inspections  Planned task observations  JHAs  Safety audits  Emergency Response Team on call 24/7 The results of the annual risk review regarding explosives at Martha Open Pit are detailed in Appendix III. The remainder of this document will outline the control measures in place to manage the risks and hazards identified in this section and in the risk register.

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