The Nenana Coal Field is currently the only active coal producing field in the State of Alaska and has produced a record 50 million tons of coal. Usibelli Coal Mine holds five active permits in the Nenana Coal Field: Poker Flats, Gold Run Pass, Two Bull Ridge, Jumbo Dome and Rosalie mines. They produce an average of one to two million tons of coal per year. The preponderance of the production is consumed by the domestic Alaskan electrical energy market; and the remaining tonnage is shipped overseas to various Pacific Rim destinations. 

The Nenana coal basin consists of ten coal fields partially or completely separated by erosion.

Coal is found in the Usibelli Group, a sequence of five formations of poorly consolidated continental sedimentary rocks of late Eocene and early-to-late Miocene age.