Approved by: Process Manager Approval Date: 16/12/2021 Next Review: 16/122023 OceanaGold Waihi Document ID: WAI-250-PLN-003 Page 13 of 44 Hazardous Substances Management Plan Risk Potential Cause Critical Controls Not meeting closure criteria/ unacceptable for discharge Level renders the lake water quality worse than predicted. Inaccurate water quality model. Water from underground backfill affects lake water quality. Loss of mining licence More difficult for future permitting Rehab & Closure Plan Updates Moss hydro seeding trial (completed) Geochemical testing of pit walls Closure assumption water to be treated and is budgeted. Trial on PAF bench of North Wall. Modelling of effect of backfilled working on pit lake water quality during consenting process. Gas storage explosion in stores area / cylinder valve damaged leading to projectile. Impact damage, Equipment failure, Incorrect storage and handling, deterioration Personal injury Equipment damage Business interruption Reorder points in PRONTO have been modified downwards Tag out and isolation, On the job training Signage Supplier refills and integrity check Preventive maintenance. Statutory inspection regimes Competency based training Visual inspection Restricted access Inspection of goods on arrival Appropriate lifting gear (certified) Inspection of gas storage area on weekly sheet Appropriate storage location Bollards Bottle trolleys to move cylinders Certified storage areas Audits/inspections (external / internal) Restricted Access Hyprox 600 - Delivery, Storage and Use Spillage contact with personnel Personal injury or health effects Automated process control system Automated re-order to prevent overfilling Bunding & drainage Preventative maintenance Tank Certification PPE 6 ROLES AND RESPONSIBILITIES Role Responsibility General Manager • Ensure that the HS - MP is understood by all personnel and used as the primary tool to manage risks/hazards associated with hazard substances. • Ensure that a system is in place and functioning for approving the use of all hazardous substances prior to the substance arriving on site. • Ensure there is a system for training all persons to access and understand Safety Data Sheets. • Ensure there is a training plan to achieve competency in handling hazardous substances. • Ensure that an audit of compliance to this standard is conducted at least every 3 years. • Final approval of any new hazardous substances. HSE Manager (or delegate) • Ensure all hazardous substances used are able to be handled safely at all times.
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