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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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Inaccurately mapped adjacent underground workings were a problem. They were generally full of water, and sometimes water seeped through the coal and highwall when mining was close to the abandoned workings. Another danger was that the stripping shovel and bucketwheel excavator, which rested on top of the coal, could be damaged by sudden drop if the pillars from old mining collapsed under them. The roof was generally Anna Shale (about 1 foot) and / or up to 7 feet of Brereton Limestone. Large areas of washout and erosion were found, usually filled with soft material, such as clay and sand. One such area was about 7 acres, in NE NE NE 4-T6S-R4W. The coal had abundant pyrite in thin lenses and on vertical cracks. Calcite was also present in vertical cracks.
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