ET, I do think that most Coal mines should be closed, for several reasons, as you say groundwater contamination, subsidence, dirty air, lung disease for the peasants who work underground, too much Carbon ending up in the atmosphere but it is a dangerous and old fashioned industry but it was what really got the Industrial Revolution to take off like a skyrocket, that in itself has left the World overpopulation and dirty and degraded.
One day Poland will get off Coal, maybe 2070 like India?