Approved by: Process Manager Approval Date: 16/12/2021 Next Review: 16/122023 OceanaGold Waihi Document ID: WAI-250-PLN-003 Page 30 of 44 Hazardous Substances Management Plan Inherent Risk (Absent or failed controls/defences) Impacted Areas (Maximum reasonable consequence) Residual/Current Risk (controls present and applied) Risk # Department (Site wide available) Risk Description (What can happen) Potential Cause(s) (How / why might it happen?) Principal Hazard Impacts Consequence (Credible worst case) Likelihood Risk Level Critical Controls Current Controls Health and Safety Environmental Social Financial Reputation Compliance OceanaGold Standard Consequence (Maximum reasonable case) Likelihood Risk Level WRR0477 Processing Hyprox 600 - Delivery, Storage and Use Spillage, contact with personnel Personal injury or health effects 4 E 10 Medium Automated process control system Automated re-order to prevent overfilling Bunding & drainage Preventative maintenance Tank Certification PPE HSNO Compliance Task SOP's Delivery Drivers trained by supplier Delivery checklist Inductions (general & Specific) Area Manuals Audits (Internal & External) 4 8.9 Hazardous Materials and Chemical Substances 4 E 10 Medium WRR0478 Processing Sodium Cyanide - Delivery, Storage and Use Spillage, contact with personnel Personal injury or health effects 5 E 15 High Cyanide storage area inside bunded shed. Bunded containment to prevent spill escaping to the workplace or environment. Cyanide facility and pipework away from acids, no possible way for acids and cyanide to interact Scrubber on solids mixing tank, automated control systems, interlock control systems to prevent tank overflows, overflows pipework to bund to catch any possible overflow, bund has sump pump rain fall redirected away from cyanide storage bund to maintain bund storage volume. Fixed HSN monitoring, Materials construction, PPE Waihi Cyanide management Plan HSNO compliance Delivery checklists, area manuals, task SOP's, cyanide awareness training, audit, inductions, security checks 24/7, 5 8.9 Hazardous Materials and Chemical Substances 5 E 15 High WRR0479 Processing Sodium Cyanide Solution (30%) - Storage and Use Spillage, contact with personnel Personal injury or health effects 5 E 15 High Bunded area, splash guards around pipes, flanges, pumps. Cyanide facility and pipework away from acids with no possibility of acids and cyanides interacting. Cyanide storage and mixing area pipework completely dedicated. Pipework isolated completely from water network. Automatic mixing, transfer dozing, automatic control systems, interlocked control systems to prevent tank overflows, bunded areas with sump pumps, rainfall directed away from cyanide storage bund to maintain bund storage volume, contingency ponds engineered and designed to hold cyanide spill. Fixed HCN monitoring, materials construction Waihi Cyanide Management Plan, Cyanide 33% liquid colour with red dye for identification, mixing checklists, area manuals, task SOPs, cyanide training awareness, security checks 24/7 on area, cyanide poisoning antidote held onsite 5 8.9 Hazardous Materials and Chemical Substances 5 E 15 High WRR0480 Processing Caustic Soda - Delivery, Storage and Use Spillage, contact with personnel Personal injury or health effects 3 E 6 Medium Stored in bunded area, splash guards in place around pipes, tanks and pumps, HSNO segregation/ compatibility requirements, automated re-order to prevent overfilling, bunding, drainage and sump pump, materials of construction, tank certification, process automation & instrumentation, preventative maintenance program, delivery point locked with unique key delivery drivers trained, delivery checklist, area manuals, task SOP's, PPE 3 8.9 Hazardous Materials and Chemical Substances 3 E 6 Medium
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