Our Mines

We are an energy company founded on our legacy of expertise and operational excellence in coal production.

Campbell & Converse Counties, WY

Antelope

Antelope Mine began operations in 1985 with a current permitted mining capacity of 42 million tons per year. Current mining involves dual seams with a coal seam thickness of 32 feet to 36 feet.

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Campbell County, WY

Cordero Rojo

Cordero began operations in 1976 and currently has a permitted mining capacity of 65 million tons per year in conjunction with the Caballo Rojo Loadout.

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San Juan County, NM on the Navajo Nation

Navajo Mine

Navajo Mine began operations in 1963 and currently has a permitted mining capacity of 4.7 million tons per year.

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Big Horn County, MT

Spring Creek

Spring Creek Mine began operations in 1980 and currently has a permitted mining capacity of 36 million tons per year.

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