Key Data:
Location
70km south of Gillette, Wyoming, USA
Geology type
Palaeocene (Early Tertiary) coal measures
Mineral type
Sub-bituminous coal
Annual production
56.8Mt (2003), currently producing at a rate of 91Mt/y
Mining method
Single-seam open pit
Coal processing
Crushing only
Key Equipment:
Bucyrus-Erie 2570WS, 1570W and 1300W walking draglines
Marion (now B-E) 351M mining shovel
Liebherr T-262, TI-272 and T-282 haul trucks
Tamrock Driltech blasthole drills
Caterpillar and Komatsu dozers
Caterpillar and Komatsu wheel loaders
Caterpillar 16G road graders