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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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A gas explosion occurred in 1923, killing one man. The east-west-trending Cottage Grove Fault System bisects the mine. Subsidiary northwest-southeast trending faults were present throughout the mine. In some places, faulting interfered with the mining plan, causing several blocks of coal to be left unmined. Pillar and roof failure noted on the source map indicated faulted zones. At least one fault had 3 feet of displacement, another 6 feet. Dikes were also present, following the same trend as the faults. The roof was composed of 65 feet of gray shale, some of which came down in small, irregular lenticular pieces. Pyrite concretions in the roof occurred only in parts of the mine. Slips were present in the roof and the coal, generally parallel to the faults. The coal contained pyrite in bands, lenses and concretions scattered throughout the seam. The coal bed lay in hills and swags; the hills were like knolls and the coal dipped from the crest in all directions. The floor was fireclay at least 2 feet thick, but no heaving was reported.
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