But, today, that mining has hollowed out the ground beneath us. Pennsylvania’s inventory of abandoned coal mines is larger than that of any other state in the nation, and the Keystone State has ...

Water is currently flowing from an old, abandoned mine ... enough water has on mines. “That’s essentially where the water becomes more than what the mine fill or the coal outcrop barrier ...

Rather, researchers are finding that groundwater pouring out of this and other abandoned coal mines contains the rare earth elements and other valuable metals that are vital to making everything ...