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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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In the west and southwest part of the mine, the streams on the surface eroded down to the coal and sometimes into the coal itself. In this area, the mine was shallow and as soon as the coal was mined, the roof came down, filling the entries with the yellow sand and plastic clay deposited by the stream. The roof in the other areas of the mine was a light gray shale that slaked off readily; top coal was left to help support the roof. The source map noted rolls in the northwestern part of the mine. The floor clay became soft when wet, but did not tend to heave.
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