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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof consisted of black shale, which contained concretions in the lowest 6 inches. Irregular clay veins and minor faults were present in this mine, causing poor roof conditions over small areas. Some faults had 2-foot offsets; a 4-foot offset was noted in one instance. In the western workings, old channels eroded the limestone roof, leaving glacial till directly above the coal. Those areas were unminable. A squeeze was noted in SE SW SE 36-T2N-R9W. Areas of thin rock above the coal were noted in the northern parts of the mine.
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