Chapter 6

6.0 Chapter 6: Prevention And Mitigation (Ward Wilson)

• 6.1 Introduction
• 6.2 Objectives of Prevention and Mitigation
• 6.3 The ARD Prevention and Mitigation Approach
• 6.4 Relevance of ARD Source
• 6.5 Consideration of ARD Factors
• 6.6 ARD and Metal Leaching and Sulphate Production
• 6.7 Climatic and Other Factors
• 6.8 Phased Approach
• 6.9 Overview of Methods
  • 6.9.1 Remining
  • 6.9.2 Special Handling Methods
    • 6.9.2.1 Incorporation in Mine Plan
    • 6.9.2.2 Segregation
    • 6.9.2.3 Desulphidization
    • 6.9.2.4 Compaction and Physical Tailings Conditioning
    • 6.9.2.5 Encapsulation and Layering
    • 6.9.2.6 Blending
    • 6.9.2.7 Co-disposal
    • 6.9.2.8 Permafrost and Freezing
  • 6.9.3 Additions and Amendment Methods
    • 6.9.3.1 Passivation
    • 6.9.3.2 Alkaline materials
    • 6.9.3.3 Organics
    • 6.9.3.4 Bactericides
  • 6.9.4 Water Management Methods
    • 6.9.4.1 Hydrodynamic controls
    • 6.9.4.2 Dewatering
    • 6.9.4.3 Diversion
    • 6.9.4.4 Filling
    • 6.9.4.5 Seals
  • 6.9.5 Dry Cover Methods
    • 6.9.5.1 Organic
    • 6.9.5.2 Soil
    • 6.9.5.3 Limestone and Alkaline
    • 6.9.5.4 Synthetic
    • 6.9.5.5 Gas
    • 6.9.5.6 Vegetation
  • 6.9.6 Water Cover Methods
    • 6.9.6.1 Subaqueous
    • 6.9.6.2 Partial water cover
    • 6.9.6.3 Wetland covers
  • 6.9.7 Impact Mitigation
    • 6.9.7.1 Attenuation
    • 6.9.7.2 Dispersion
    • 6.9.7.3 Stream Flow Regulation
    • 6.9.7.4 Water recycle and reuse
• 6.10 Secondary Impacts
• 6.11 Evaluation of Alternatives
• 6.12 Design and Construction Considerations
• 6.13 Maintenance and Monitoring Considerations
• 6.14 Closure and Long-term Considerations
• 6.15 ARD Prevention and Mitigation FAQ's
• 6.16 References