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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof was 35 to 40 feet of gray shale with a water-saturated gravel above. The panels were worked out as rapidly as possible before the roof weakened and let in water, then sealed with concrete so that no water could leak out into the active mine. The source map indicated areas of “bad top” and “water”. The coal was exceedingly regular. Concretions were found occasionally.
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