The GSM extracts coal from the Springfield, or Indiana No. 5 coal seam. The seam lies between 450 and 650 feet deep and dips gently (about 1%) to the west/southwest. The seam varies in thickness over the reserve area from over nine feet in the northern areas in close proximity to the Galatia paleochannel and thins to four feet in the south, distal to the channel. The average coal thickness within the GSM is about six feet.

On a 1.50 float, dry basis, the Springfield seam averages about 7.1% ash, 2.0% sulfur, and 13,500 btu/lb. The mineral deposit type (coal rank) mined by the GSM is a high volatile bituminous B/C coal.

The geologic model developed to characterize the resource/reserve is a bedded sedimentary deposit model. This is generally described as a continuous, non-complex, typical cyclothem sequence that follows a bedded sedimentary sequence. The geology, including coal thickness and extent has been and continues to be verified by an extensive drilling program.

Gibson South mine is an underground, located near the city of Princeton in Gibson County, Indiana.

Mine access is carried out via slope and shaft and utilizes continuous mining units employing room-and-pillar mining techniques to produce low/medium-sulfur coal.

Production from the Gibson South mine is shipped by truck or transported by rail.

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