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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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A fault was noted in the extreme northeastern part of the mine, most likely part of the Rend Lake Fault System. Faults were also present in other parts of the mine, as well as high-angle shear fractures with no displacement, associated with normal faults downthrown (sometimes more than 12 feet) to the east. The faulting halted eastward expansion, and Orient No. 6 Mine (mine index 885) mined westward until that mine encountered the fault problems (poor roof and coal offsets). Roof falls were caused by silty shale (the layers did not adhere well to each other), intersecting slips, thin coal rider seams, and fractures in the roof. The roof was generally an irregular thickness of Energy Shale. Rolls were noted occasionally. Top coal was left on the roof and floor. Pyrite and calcite were present on vertical joint facings.
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