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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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This mine extended about 11 miles in the north-south direction and 7 miles in the eastwest direction, and geologic conditions were diverse. A large normal fault was encountered that halted expansion in the northeastern part of the mine. Displacement was 7 to 15 feet downthrown to the northeast. This fault, or set of parallel faults, extended over 2 miles N-NW and southward into NW SE NW 17-T13N-R3W, in Peabody No. 8 Mine (mine index 220). In 1967, seven entries were driven through a NE-SW trending channel sandstone in NE SW 17- T13N-R4W, Sangamon County. The sandstone was water-bearing, and consequently the mine was wet in that area. The top of the coal was eroded, but 4 to 5 feet of coal remained. These channels of Anvil Rock Sandstone channels are evident in the mining patterns shown on the accompanying map. Most channels were 200 to 400 feet wide with wider flanking zones of wet conditions and/or unstable roof. The black shale roof tended to slab off along prominent jointing breaks. The 3 to 4 feet of black Anna Shale was overlain by 1.5 feet of Brereton Limestone, then 2 to 10 feet of thin-bedded Anvil Rock Sandstone that sometimes had shale interlaminations, another 1.5 feet of limestone, and 2 feet of shale. In some roof falls this entire sequence was exposed. In NW 34-T13N-R4W and SW 27-T13N-R4W, a peat trough resulted in coal up to 13 feet thick, in a north-south trending linear depression. The grades were too steep for the equipment and the feature was difficult to cope with. Roof failures also made this feature difficult to mine, although only the usual 6 to 7 feet of coal was actually removed. A pattern of slips initiated a roof fall of 35 feet of silty shale and gray shale within this area of thick coal. The coal in the northern part of the mine was exceptionally hard but relatively clean of impurities, and the underclay was rather soft. In the southern part of the mine, the coal was softer but had more impurities, and the underclay was much firmer.
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