Coal-mining company Armstrong Energy Inc. filed for bankruptcy on Wednesday with a plan to turn over ownership of its struggling operations to a competitor and its lender. The St. Louis company plans to use the chapter 11 process to transfer the ownership of its five mines and other operations to a new entity owned by Illinois coal company Knight Hawk Holdings LLC and some of Armstrong Energy’s noteholders. Nearly all of Armstrong Energy’s shares are now owned by energy investor Rhino Resources Partners Holdings LLC. The terms of the transaction weren’t immediately disclosed in documents filed in U.S. Bankruptcy Court in St. Louis. Armstrong Energy mines for coal in western Kentucky on land that is estimated to have 445 million tons of proven and probable coal reserves, according to a June 30 report. It also operates three coal processing plants and a river dock coal handling and railroad loading […]