GILLETTE, Wyo.–(BUSINESS WIRE)–Cloud Peak Energy Inc. (NYSE:CLD), one of the largest U.S. coal producers and the only pure-play Powder River Basin (“PRB”) coal company, plans to announce its first quarter 2017 financial results on April 27, 2017, after the markets close. A conference call with management is scheduled at 5:00 p.m. ET on April 27, 2017 to review the results and current business conditions. The call will be webcast live over the Internet from www.cloudpeakenergy.com under “Inves