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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The mine is crossed by a number of faults trending WNW-ESE in which the offset is about the thickness of the seam, upthrown on the south side. Limestone forms the immediate roof over most of the mine, black shale is the roof over the remainder. Black shale is very poor roof and must be heavily timbered. Sometimes coal is left with the black slate as a good clean parting occurs there. The floor clay heaves very badly when wet or if pillars are robbed. The source map shows areas of squeeze in the north central part of the mine, some rooms labeled βcavedβ in the north part of the mine, and several offsets in the mining pattern (throughout the mine) due to faults.
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