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These are pictures of area mine subsidences. For those of you that aren't familiar with the term, a subsidence is caused when the workings of a mine collapse and the ground above tries to fill in the space, leaving a gaping hole. When vertical shafts were sealed, hundreds of tons of rock were dumped down the shaft and a concrete cap was placed over the top. After awhile the concrete breaks down and the rocks settle and fall into the mine.

Subsidences! Page 1

Subsidences! Page 2

Subsidences! Page 3

Subsidences! Page 4

Subsidences! Page 5

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