| ISSUES |
REHABILITATION OBJECTIVES |
MEASURES |
| Physical Stability Issues: |
| Tailings Surface |
Control dust migration, control water erosion |
- establish erosion resistant cover of vegetation, soil, riprap or water
|
| Dams |
Factor of safey >1.5 for static conditions with erosion resistant overtopping protection |
- appropriate site selection and dam design
- stabilize embankments by constructing toe berm to flatten overall slope
- riprap, vegetation or soils cover to control erosion
- increase freeboard and/or upgrade spillway to prevent erosion by overtopping in extreme events
|
| Other |
Remove or establish long term stability of spillway, decant towers and pipes |
- remove or plug/backfill structures and decant lines through embankments
- design and construct diversions and spillways for extreme events and long-term stability
- define and provide for long-term monitoring and maintenance, avoid on-going operation where possible
|
| Chemical Stability Issues: |
| Tailings and Pore Water |
Meet water quality objectives by: controlling reactions and/or controlling migration; collect and treat |
- flood to control reactions
- pre-treatment removal of deleterious material for controlled dispersal elsewhere, or blending with alkali material to mitigate acid drainage
- cover to control acid reactions and/or migration using inert material or bog
- ditch to divert runoff
- collect and treat
|
| Dams, Structures |
Meet water quality objectives by: controlling reactions and/or controlling migration; collect and treat |
- do not construct with potential acid generating or leachable materials
- decontaminate and/or remove acid generating or leaching materials
|
| Land Use Issues: |
| Productivity of Land and Visual Impacts |
Return to original state or approved alternative use |
- rehabilitate by: flood, contour, cover, revegetate, wetland
|
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Environmental Technology for Mining
