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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The mine intersected some normal or strike-slip faults, some with displacements up to 80 feet, all part of the Cottage Grove Fault System (see ISGS Circular 522, Cottage Grove Fault System). Most of the fault offsets were small, from a few inches to just less than 15 feet, but a few were up to 80 feet. The source map indicated βbad topβ near the faulted areas. An oil seep was noted, and water and gas also entered along the fault planes. Many of the western parts of the mine noted water and bad top at the furthest extent of mining. Faults were reported throughout the mine, sometimes requiring a change in the configuration of rooms. Older portions of the mine collected water and were sealed. The gray shale roof displayed slickensides. In some areas of the mine, the roof was black shale. The coal seam contained some pyrite and calcite filled some cleats.
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