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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The Cottage Grove Fault System runs through the northeastern workings, with two northwest-trending faults. Several small faults were reported, and a large fault was reported 300 feet west of the shaft. This fault has 20 feet of displacement with the downthrown side to the west. The source map showed portions of the mine where faulting, bad top and water were problems (along the western side of the mine in the north half 22-T8S-R2E and along the eastern side of the mine in SW 14-T8S-R2E). The roof was a massive gray shale that required the upper 18 to 24 inches of coal left to support the roof in the entries, but the top coal was generally mined in the rooms. The roof was treacherous where the top coal was taken down. Coal stringers extended up into the roof, and this also caused roof falls. Roof rolls were frequent. The coal bed contained local dips and hills, some affecting coal thickness.
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