SAFETY, HEALTH & ENVIRONMENT BULLETIN - MIRMgate

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• geotechnical characterisation of representative samples of the tailings materials for stability and deposition determination as well as for de-watering conditions for closure • mineralogical analyses. • the effects of material changes with time (e.g. weathering of the pyrite content, change from alkaline conditions upon deposition and subsequent change to acid condition, and disintegration of components) • environmental baseline data collection including climatology • environmental impact assessment of the proposed modifications. D3 Items to be Included in a Design Report These are: • environmental aims • design aims and assumptions • design details, description of the design and design parameters for each of the facility elements • calculations for structural and hydraulic adequacy, including safety factors. • average and extreme water balance simulations • engineering plans with general arrangements of the facility works before deposition commences • engineering plans showing the construction details for the entire infrastructure associated with the facility • operational aims and constraints • operational and surveillance requirements • failure mode and consequence analysis • process details, tailings production rates, residue densities and properties and geo-chemical characteristics of the tailings • specifications for the construction quality assurance and the required qualifications and experience of personnel to undertake the construction, commissioning and operation of the facility • conceptual closure details and costs. D4 Items to be Included in an Operating Manual The Operations Manual should contain: • administration and responsibilities for facility operation, safety and review • design overview and key design criteria • stage-capacity curves • tailings deposition plans • water management plans and the water balance • planning requirements (reviews, construction, operation and training) • training and competency requirements • operating systems and procedures • facility surveillance, including checklists, signs of unfavourable performance, and responses to unusual readings, events or observations • reporting and documentation requirements • emergency action and response plans • construction and quality assurance and quality control requirements • indicative closure details • standard formats for monthly status reports and performance reviews • reference reports. Issued by the Anglo Technical Division page 36 of 47
Good operational practices that should be specified in the operations where appropriate would typically include the following: • stockpiling topsoil for future rehabilitation purposes • access control and clear signage that warns of potential hazards • secondary containment of slurry delivery pipe line spillage • slurry pipe line burst or leak detection with automatic pump shutdown • minimisation of water retention or storage on the facility surface • minimisation of the discharge of process waters to • amelioration of any excess process waters prior to discharge • seepage control and management • diligent water management in accordance with predetermined objectives • exclusion of external surface water entering the facility • separation of clean and process waters to minimise the contamination of clean water • maintenance of freeboard in excess of that required for the design storm appropriate to the level of hazard posed by the facility • systematic deposition of tailings in accordance with the objectives specified by the design and operating procedures • maintenance of the decant pool away from all impoundment walls unless specifically designed for • deposition rates appropriate to the consolidation characteristics of the tailings • geometric control of wall building or raising • prohibition of co-disposal of other mine waste products • avian and wildlife protection measures • clear referencing in the field of each and every monitoring point, such as piezometers, monitoring beacons, drain outlets, etc. • concurrent rehabilitation wherever possible. D5 Items to be Addressed in a Review or Audit During the review or audit the third examining party should, where appropriate: • conduct a detailed formal inspection to review the physical condition of the facility in the presence of operational management • undertake a thorough review of the management system • review and analyse monitoring and water balance data and compare with pre-determined performance criteria • review the adequacy of relevant documentation, information and data • assess the factors of safety against failure • assess the freeboard recalculation • determine the environmental status and performance • determine compliance with the legislation and permits, codes of practice and the operating manual • confirm the historical and predicted development of the facility and review of the latest life-ofmine plans and production scenarios • review the adequacy of pumping • formulate specific deposition strategies and development plans for the short- and long-term to ensure that the strategies comply with legal requirements and render the facility stable and safe • conduct risk assessments to re-evaluate downstream • review emergency preparedness, response procedures and contingency plans • establish and update possible failure modes and effects Issued by the Anglo Technical Division page 37 of 47
Page 1 and 2: SAFETY, HEALTH & ENVIRONMENT BULLET
Page 3 and 4: Contents 1 Introduction 2 The Desig
Page 5 and 6: Because a tailings disposal facilit
Page 7 and 8: full risk assessment should be done
Page 9 and 10: Monitoring, Checking and Corrective
Page 11 and 12: • an emergency preparedness plan
Page 13 and 14: Appendix A Overview of Existing Reg
Page 15 and 16: (Appendix C of Original Document) O
Page 17 and 18: and every three years for Category
Page 19 and 20: implementation in accordance with t
Page 21 and 22: C.6 CHILE The legislation in Chile
Page 23 and 24: made by authorities during construc
Page 25 and 26: • Bulletin 103 Tailings Dams and
Page 27 and 28: DATE AUTHORITY AUTHOR TITLE 1998 De
Page 29 and 30: MEXICO DATE AUTHORITY AUTHOR TITLE
Page 31 and 32: DATE AUTHORITY AUTHOR TITLE Eds. En
Page 33 and 34: Appendix C Extract from SANS Specif
Page 35: Appendix D Checklists for Tailings
Page 39 and 40: D7 Anglo American plc Golden Rules
Page 41 and 42: Golden Rule 2 Working at Heights Op
Page 43 and 44: Golden Rule 4 Surface Vehicle Safet
Page 45 and 46: Golden Rule 6 Lifting and Material
Page 47 and 48: • Task completion review • Cris

SAFETY, HEALTH & ENVIRONMENT BULLETIN - MIRMgate

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