All mines are temporary structures. They can remain active for many years, but they will eventually run out of minerals and cease operations. This does not automatically mean that the environment and wildlife will no longer suffer.
Responsible owners would backfill the underground mine. However, not all mine operators would resort to this option because the process can be very expensive. Failure to backfill the mine can lead to a problem called subsidence, which occurs when abandoned mines collapse. This will undo any
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