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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof in the northern part of the mine was light gray shale (white top) and came down readily. “Several feet” of top coal had to be left to support this roof. Other areas had 6 inches to 6 feet of black shale as roof, which drew in some places, or limestone roof. The mine manager noted that the roof in east-west entries held, while the roof in north-south entries fell in a very short time. The coal rolled considerably in the eastern and southern parts of the mine, making it difficult to maintain easy grades on the haulage roads. The roadbeds had many hills and valleys. Rolls and slips were present in the seam, but not of sufficient density to have a detrimental affect on mining. Pyrite lenses and calcite veinlets were also present in the coal. The underclay was 4 to 5 feet thick and heaved when wet.
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