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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof was predominantly black shale, but a light gray shale roof was common in the eastern part of the mine. This gray shale was present as heavy, soft lenses up to 10 feet wide and 30 feet long. The lenses had many slips and this made the gray shale a treacherous roof. Up to 14 inches of top coal was left to support the roof. The coal contained pyrite and calcite veins and fracture fillings, especially near the top of the seam.
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