their shift away from coal taking a toll on the last of the cold Giants in Montana and Wyoming today cloud peak energy file for chapter 11 bankruptcy the last of the big coal companies in our area cloud peak operates three coal mines in the Powder River Basin the antelope and Cordero Rojo mines in Wyoming and the Decker mine in Montana the move comes two months after cloud peak delisted its stock because of low prices officials for the Gillette Wyoming based company say they plan to continue normal operations as they reorganize and continue to try to find a buyer