The old main entrance to the Clyde Mine in Fredericktown, Washington Co, PA, as seen in 2003.
This mine originally opened around 1900. My greatgrandfather was the stable boss and one of his sons worked as a miner.
The mine tunnels ran for quite a ways and were deep underground near the house of my great aunt. One day the house shook with all the blasting and cracked the sidewalk. Guess she was lucky it didn't destroy the house!