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Historical Officers and Directors <br />for the period of 102003 to 2/23/2009 <br />Rio Tinto America Holdings Inc. (name change 7/28/1997) <br />A Delaware Corporation Incorporated 1/19/1989 <br />Address: 505 South Gillette Avenue <br />PO Box 3009 <br />Gillette, Wyoming 82717 -3009 <br />AVS Entity ID No: 145520 <br />FEIN: 13- 3504538 <br />Director /Officer Name <br />Title <br />Role <br />Appointed <br />End Date <br />Alan Davies <br />Chief Legal Officer <br />Officer <br />12/6/2004 <br />4/23/2007 <br />Kevin L. Baker <br />Assistant Secretary <br />Officer <br />12/6/2004 <br />4123/2007 <br />Michael Barrett <br />Vice President <br />Officer <br />5/11/2005 <br />4/23/2007 <br />Alan Davies <br />Vice President and Chief Financial <br />Officer <br />4/26/2004 <br />4/23/2007 <br />Officer <br />Michael Barrett <br />Controller <br />Officer <br />5/11/2005 <br />7/26/2007 <br />Ian C. Ratnage <br />Vice President <br />Officer <br />5/24/1990 <br />5/1/2008 <br />Ian C. Ratnage <br />Treasurer <br />Officer <br />12/2/1993 <br />5/1/2008 <br />Christopher Lenon <br />Chairman <br />Director <br />5/17/1993 <br />12/8/2008 <br />Christopher Lenon <br />President & Chief Executive Officer <br />Officer <br />12/2/1993 <br />12/8/2008 <br />Exhibit 2 -27 Revision Date: 3/24/09 <br />Revision No.: MR -98 <br />