Mining in the Dahlgren Quadrangle
The Opdyke Coal was close to the surface in the Dahlgren Quadrangle, usually less than 40 feet deep. Although the coal was thin, rarely reaching 4 feet thick, it was economic to mine by stripping off the overburden. Mining ceased in 1979, when the Eads Mine (mine index 917) closed.
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Mines that Appear on the Dahlgren Quadrangle