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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof was very good, with 2 to 3 feet of black shale below sandstone cap rock that ranged from 6 inches to 6 feet thick. Carburetted hydrogen gas (“firedamp”) was sometimes found at the face of the entries. The southern part of the mine showed numerous unmined areas that could indicate geologic problems (the areas were not labeled).
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