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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The Herrin Coal dipped to the north and became 40 feet deeper than at the shaft. The roof was 2 to 20 feet of shale, which was often difficult to keep up. The eastern and northeastern parts of the mine had roof falls propagate to the surface, creating sinkholes. The Herrin Coal contained a few slips, and joints were filled with pyrite. The slips had little displacement, but hindered mining by altering the grades of the haulage routes. The floor clay was 18 to 24 inches thick and was plastic, but reports indicate the clay did not heave. It often contained concretions.
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