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Historical Officers and Directors <br />For the Period of December 2006 to December 2011 <br />Colowyo Coal Company L.P. (formerly through Kennecott Colorado Coal Co.) <br />i Ror-Ime , e o :-IM+y <br />ROW <br />A <br />p2Li:iiI&l.. <br />Kevin L. Baker <br />Legal Officer <br />Officer <br />2/10/2009 <br />11/30/2011 <br />J. Michael Beck <br />Chief Financial Officer <br />Officer <br />10/1/2010 <br />11/30/2011 <br />James P. Berson <br />President & Chief Executive <br />Officer <br />1/1/2009 <br />11/30/2011 <br />Officer <br />Franck Bertoux <br />Assistant Treasurer <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Bernd Beyer <br />Treasurer <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Shannon S <br />Secretary <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Crompton <br />Ed Moyer <br />Operating Officer <br />Officer <br />10/1/2010 <br />11/30/2011 <br />} Mark W. Roberts <br />Director Commercial <br />Officer <br />1/1/2009 <br />11/30/2011 <br />Planning & Business <br />Development <br />Jack R. Welch <br />Assistant Treasurer <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Oliver <br />Assistant Treasurer <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Wolfensberger <br />Chris J. Wykstra <br />Assistant Treasurer <br />Officer <br />6/1/2006 <br />11/30/2011 <br />Cheryl A. English <br />Vice President Human <br />Officer <br />6/1/2006 <br />1/2/2007 <br />Resources <br />Kevin L. Baker <br />Assistant Secretary <br />Officer <br />8/1/2001 <br />1/31/2007 <br />Alan Davies <br />Vice President and Chief <br />Officer <br />4/26/2004 <br />1/31/2007 <br />Financial Officer <br />Alan Davies <br />Vice President of Finance, <br />Officer <br />12/1/2004 <br />1/31/2007 <br />Strategy and Law <br />Exhibit 2-15 <br />Revision Date: 4/7/17 <br />i Ror-Ime , e o :-IM+y <br />