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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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A group of small faults was mapped along the 7th through 10th Main East entries. These were high angle, normal faults that strike NNW with displacements from a few inches to about 1 foot. These faults had the typical trend and style of subsidiary faults of the Cottage Grove Fault System, the major faults of which lie about 6 miles south of this mine. Although the faults were small, they weakened the roof. A large roof fall developed where such a fault ran the length of a crosscut between the 9th and 10th Main. Roof falls tended to be in north-south trending mains and rooms. Although top coal was left to protect the roof (composed primarily of gray shales), many falls of 10 feet or more occurred. The Energy Shale had a preferred fracture pattern trending northeast-southwest. Rolls were present, reducing the coal thickness to 2 feet. These rolls were up to 30 feet wide and 5 feet deep, and commonly occurred in parallel sets. Recently active faces bled gas. Concentrated masses of concretions were found.
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