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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof consisted of “white top”, a soft, heavy shale that fell after exposure to air. This shale reportedly was 28 to 30 feet thick. It was necessary to leave 1 to 3 feet of top coal to protect the roof from exposure to air; roof falls were rare because of this precaution. A few pyrite stringers were present in the top of the seam. Rolls and “hills” occurred throughout the mine. The hills caused considerable trouble, because much grading was required, and the weight of the roof was concentrated in the low areas, resulting in squeezes. The blue band was thick, up to 14 inches. The floor clay was more than 10 feet thick and heaved when wet. A squeeze in the western side of the mine was the result of robbing pillars. This floor clay was harder and more shaley than the usual fireclay floor under the Herrin Coal in other areas of the state, and was characterized by many small slips.
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