Subsidence
  Mine subsidence is movement of the ground surface as a result of the collapse or failure of underground mine workings. In active underground mining operations using longwall mining or high extraction pillar recovery methods, subsidence can occur concurrently with the mining operation in a predictable manner. The long-term stability of subsidence areas has not been proven and it is believed that such areas leave permanent scars and cannot be revegetated or restored to a condition that will permit its use by wildlife or the public. See also, Underground Block Caving Method.
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