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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof is limestone over more than 50% of the mine. In these areas, there is a clod between the coal and the roof that tends to stick to the coal. Cracks are present in some places, and there is generally some movement where the cracks are present - usually an inch or two, but rarely as much as a foot. The coal under the larger cracks have clay-filled cracks similar to the horsebacks of the Springfield Coal. Where black shale forms the roof, concretions are common, generally 1 to 3 feet in diameter. The black shale is difficult to keep up. Pyrite occurs in sheets between the benches, especially in and about 5 inches above the blue band.
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