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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof was 8 inches to 3.5 ft of black shale that required heavy timbering (every 4 ft) and usually came down anyway, especially near the horsebacks. If the shale was less than 1.5 ft thick, it was pulled down by the miners. In some areas, large dark calcareous concretions were present. Above the shale was a 6 inch to 4 ft limestone that had an uneven contact with the shale beneath. Occasional rolls and inverted conical projections of the limestone protruded down into the coal. Clay horsebacks were βeverywhereβ, and could be expensive to cut through, especially if they were hard. Charcoal and pyrite were present in lenses and bands in the upper part of the coal seam throughout the mine. The underclay was about 12 ft thick and heaved 4 to 5 inches, but no serious squeezes took place.
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