..it would hurt if they dumped it on your head;-)
WV has a very predictable topography in coal country....mountain, gully with stream, mountain. When they mine the tops...they push the dirt into the gully...filling it in. After they remove the coal...they take some of the dirt back out and rebuild the hill.
It does ruin the landscape...that is certain...but in all my years in WV...there wasn't any problems with the water associated with mining (except for retention dams bursting...causing very deadly flash floods). There are some issues with acid build with certain types of coal.
WIll look to see if I can find a study done on wellwater...but these areas are generally pretty remote. They make the middle of nowhere look exciting.