Tailings impoundment decommissioning
noun phrasePronunciation: /ˈteɪlɪŋz ɪmˌpaʊndmənt ˌdɪkəˌmɪʃənɪŋ/
The systematic closure and environmental stabilization of storage areas containing finely ground mine waste, including water removal, consolidation, erosion control, and long-term containment design. This process addresses the dual challenges of structural stability and preventing seepage of contaminants into groundwater.
Plain English
Safely closing and securing the pools or ponds where finely ground mine waste was stored.
Etymology & History
Usage
"The tailings impoundment decommissioning project required constructing a low-permeability cap to prevent selenium leaching."
Style guide notes: Use 'impoundment closure' for brevity; specify 'decommissioning' when emphasizing final abandonment status.
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Frequently Asked Questions
What are the main risks of abandoned tailings impoundments?
Dam failure causing debris flows, and seepage contaminating groundwater with dissolved metals.
How long do tailings impoundments need monitoring after closure?
Typically 30+ years minimum; some sites require perpetual care depending on water chemistry stability.
Why Test Candidates on This?
Critical for assessing comprehension of geotechnical engineering, hydrogeology, and multi-phase closure strategies.
Required skill level: Senior