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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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A large fault was noted 2200 feet west of the shaft. This made a βhillβ where the floor was 77 feet higher than at the shaft. Faults were also noted on the source map in the southwestern part of the mine. The west side was downthrown 40 feet and halted westward expansion. The roof was gray shale over much of the mine, with black shale and limestone comprising the roof over the eastern part of the mine. 300 feet east of the shaft, a gray shale lens was present (200 feet long and 2 feet wide) that split the coal in two benches, with 75% of the coal below the lens and 25% above. Rolls were present but infrequent, in one case cutting out half the coal seam for a 20- foot length. Some calcareous concretions were present, but their effect on mining was not noted. Some gas was noted; gas explosions in 1909, 1912, and 1920 resulted in three deaths. The floor was underclay varying in thickness from 0 to 4 feet. It was thicker in the east part of the mine, under the black shale and limestone roof.
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