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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof was shale over 14 feet thick, and slaking occurred after exposure to the air. After turning the entries north and west, they ran into very treacherous roof conditions, with an abundance of slips. According the to the mine notes, a mine map showed areas of bad roof conditions trending from the southwest quarter of section 20 of T19N-R11W, through the northwest quarter of section 29, toward the slope in the northeast quarter of section 30 and further southwest from there.
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