On November 4, 2014, Director Jim Voorhees provided notice to the Board of Directors of Cloud Peak
Energy Inc. that he will resign from the Board effective on December 31, 2014. Mr. Voorhees has served as a director of Cloud Peak Energy since March 2011, and is a member of the Compensation Committee, Nominating and Corporate Governance Committee, and Health, Safety, Environment and Communities Committee of the Board. Mr. Voorhees is resigning at year-end 2014 to spend additional time with his family and on other professional activities.