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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The Cottage Grove Fault System ran through this mine (see ISGS Circular 522, Cottage Grove Fault System). Vertical offsets were commonly about 5.5 feet; horizontal displacement was about 20 feet. This resulted in prominent east-west features in the roof. The roof was gray shale with slips and slickenslides, and it tended to fall if not bolted. The coal had a few shaly partings and some thin pyrite facings on bedding planes. The working face was very wet. Water and gas bubbled out of the rock near stoppings. Concretions were present in the upper part of the seam.
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