This plant was planned to be built by the Air Force. 9/2007 Maelstrom Air Force Base in Great Falls 10/2006 DKRW Advanced Fuels and Arch Minerals will take the primary role as the developers of the $1.3-billion Bull Mountain Coal to Liquid plant. 8/2005 Otter Creek coal tract The Air Force is prepared to lease out 700 acres of Maelstrom Air Force Base to anyone qualified and willing to build and operate a plant to make jet fuel out of coal. The price tag, though, could be $1 billion. "The Air Force rejected the plans for the coal-to-liquids plant because of possible conflicts with the 341 Missile Wing's nuclear mission. The release said the concerns included decreased security near the base's weapons storage area, interference with missile transportation and "explosive safety arcs and operational flight safety issues.""