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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The northern part of the mine had good limestone roof, but the floor was 4 to 5 feet of claystone that heaved only a little. Elsewhere, the roof was gray shale and tended to fall badly when it was thick. Even this poor roof thinned to the south, nearing the subcrop, and prevented further mine expansion southward. Water entered the mine from surface gravels. The center part of the seam contained many shaly partings. Some pyrite and calcite or gypsum was present in vertical streaks. Some small local faults occurred in the coal. A roll forced the coal down 3 feet. In one location, boulder-sized concretions made mining impossible. The concretions were finely crystalline calcite and ranged from 1 to 3 feet in diameter.
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