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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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A normal fault with 3 to 4 feet of displacement was seen. Rolls were present, sometimes cutting out as much as 3 feet of coal. The roof was siltstone and gray shale that contained lenses and laminae of sandstone, coal stringers and plant debris. The bedding layers gradually thickened and thinned. In one place, a 10-foot wide zone of fractures was present in the roof, and water seeped in. Roof falls from 9 to 12 feet high were noted, and falls were more common in N-S entries. The cause was determined to be horizontal stress with E-W compression, which formed kink zones. The mine plan was altered to drive the mine headings at a 45-degree angle to the principal stress axis. Siderite was present as laminae and small nodules in the roof. The blue band was the only persistent parting in the coal, and was 1.8 to 2 feet above the floor. The blue band varied in thickness but was always less than 1 inch thick.
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