A haul truck is pictured at a coal seam at a coal mine in the Powder River Basin in Wyoming

 
A haul truck is pictured at a coal seam at a coal mine in the Powder River Basin in Wyoming
A haul truck is pictured at a coal seam at a coal mine in the Powder River Basin in Wyoming in this undated handout photo obtained by Reuters November 30, 2012. REUTERS/National Mining Association/Handout