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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The upper 6 inches of the Herrin Coal contained flat concretions in one area. Some difficulties encountered in surface mining Pit No. 3 included shooting the hard limestones (Piasa & Brereton) and in drilling the shot holes in the soft sand above the bedrock, which required continuous casing.
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