On a little “field trip” today, I found that strip mining is still “alive and not so well” in Maryland. On highway 36, south of Frostburg (on top of the Allegheny Ridge behind Cumberland) there is a huge strip mine scar visible to the south. When you drive south over I-68, you drive past what looks like an active mine.
As you drive down toward Barton, Luke and Westernport, you see some more strip mine scars on the ridges. There's a stream through Barton. I am reminded of Luke Andraka's winning science fair project on acid drainage from mines.
Also, east of Cumberland, off I-68, to the immediate south, near Martins Mountain and the town of Flintstone (with its “Stone Age Café”) there is a large quarry which looks like a typical strip mine.