The mine extracts thermal coal from the Anderson and Canyon Seams, with up to 44 and 36 feet, respectively, in thickness. General Geology and Coal Resources Stratigraphic units include, in descending order, recent (Holocene age) alluvial and eolian deposits, the Eocene age Wasatch Formation (the overburden), and the Paleocene age Fort Union Formation (which contains the target coal beds). Surficial deposits within the general analysis area include alluvial and eolian deposits, clinker, and weathered Wasatch and Fort Union Formations. Although clinker is present in the general analysis area, the tract has no appreciable amounts of clinker. There are thin alluvial deposits along ephemeral streams. These alluvial deposits typically consist primarily of poorly to well-sorted, irregularly bedded to laminated, unconsolidated sand, silt, and clay with minor intervals of fine gravel. The valley floors of Horse Creek, Spring Creek and Antelope Creek contain appreciable amounts of alluvium both in width and depth. The alluvial deposits in Horse Creek, Spring Creek and Antelope Creek contain much more coarse-grained material (sands and gravels) than the ephemeral tributaries that drain most of the general analysis area. The Eocene Wasatch Formation forms most of the overburden overlying the mineable coal seams in the general analysis area. It consists of interbedded lenticular sandstones, siltstones, shales, and thin discontinuous coals. There is no distinct boundary between the ........

The Antelope Mine is located in the southern end of the PRB approximately 60 miles south of Gillette, Wyoming. The mine extracts thermal coal from the Anderson and Canyon Seams, with up to 44 and 36 feet, respectively, in thickness. Significant areas of unleased coal north and west of the mine are available for nomination by us or other mining operations or persons. Based on the average sulfur content of 0.50 lbs SO2/mmBtu, the reserves at our Antelope Mine are considered to be compliance coal under the Clean Air Act, and this coal is some of the lowest sulfur coal produced in the PRB.

Coal at the Antelope Mine is mined using conventional surface-mining methods and shipped from an onsite railroad loading facility to electric utilities and industrial customers in the U.S. Antelope Mine uses a truck and shovel and dragline mining method.

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