Supporting Technical Assessments

Approved by: Process Manager Approval Date: 16/12/2021 Next Review: 16/122023 OceanaGold Waihi Document ID: WAI-250-PLN-003 Page 14 of 44 Hazardous Substances Management Plan • Manage the approval process for introducing new and or sample hazardous substances onto site • Monitor the training plan for achieving competency in handling hazardous substances. • Monitor expiry of Certified Handler’s certificate for staff. • Ensure an SDS is available for all hazardous substances used on site, or if appropriate the risk assessment. • Monitor storage of all hazardous substances to ensure they are kept in approved storage areas. • Maintain the ChemAlert database. Department Managers • Act as the Person in Charge. • Ensure all hazardous substances used are able to be handled safely at all times • Manage the site location Compliance Certificates, and stationary container test certifications in their work area. • Keep the Waihi Operations approved hazardous substances list current. • Ensure the approval process for introducing new and or sample hazardous substances onto site is followed. • Conduct annual Hazardous substances audit. Purchasing and Logistics Supervisor Ensure all people involved in procurement understand: • Correct procedures for accepting delivery of hazardous substances; • Relevant emergency procedures; • Not to accept unlabelled hazardous substances containers; and • Ensure hazardous substances delivered are placed into approved storage areas upon delivery, with correct segregation. • Ensure all hazardous substances supplied and/or stock managed by a vendor is approved for use at Waihi Operations • Manage the stationary container test certification for diesel tanks Principal’s Representatives • Ensure all contractor personnel are adequately trained in the safe handling and use of hazardous substances in your area of accountability. • Ensure any new substances proposed to be introduced are subject to the Product or Chemical Evaluation process. • Ensure contractors maintain a register of hazardous substances that is available on demand. • Ensure contractors have SDS’s available on demand. Superintendents, Foremen and Supervisors • Ensure all hazardous substances are used according to the requirements of the SDS and any particular Standard Operating Procedures that may exist for the work being undertaken. • Ensure all hazardous substances used are able to be handled safely at all times Plant Metallurgist Provide technical advice to site personnel on specific hazardous substances and hazardous substances where and when requested. Process Maintenance Supervisor Manage the stationary container test certification for processing tanks. Contractors Comply with the requirements of this Standard and legislative requirements.

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