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Historical Officers and Directors <br />for the period of 1/2/2003 to 2/23/09 <br />Rio Tinto America Inc. (7/28/1997 fka RTZ America Inc.) <br />A Delaware Corporation Incorporated 6/27/1973 <br />Address: 505 South Gillette Avenue <br />Caller Box 3009 <br />Gillette, Wyoming 82717 -3009 <br />AVS Entity ID No: 145522 <br />FEIN: 11- 3359689 <br />Director /Officer Name <br />Title <br />Role <br />Appointed <br />End Date <br />Kent W. Goates <br />Director <br />Director <br />3/11/2002 <br />3/2/2003 <br />Bret K. Clayton <br />Director <br />Director <br />3/3/2003 <br />6/9/2003 <br />Blake L. Measom <br />Director <br />Director <br />6/9/2003 <br />2/6/2004 <br />Patricia A. Britton <br />Director <br />Director <br />3/11/2002 <br />12/6/2004 <br />Richard E. Pierce, Jr. <br />Director <br />Director <br />10/2/1996 <br />12/6/2004 <br />Alan Davies <br />Director <br />Director <br />4/26/2004 <br />4/23/2007 <br />R S Light <br />Director <br />Director <br />12/6/2004 <br />4/23/2007 <br />Ian C. Ratnage <br />Director <br />Director <br />10/2/1996 <br />5/1/2008 <br />Christopher Lenon <br />Chairman <br />Director <br />10/2/1996 <br />12/8/2008 <br />Kent W. Goates <br />Vice President and Chief Financial <br />Officer <br />3/14/2002 <br />3/3/2003 <br />Officer <br />Bret K. Clayton <br />Vice President and Chief Financial <br />Officer <br />3/3/2003 <br />6/9/2003 <br />Officer <br />Blake L. Measom <br />Vice President/Controller <br />Officer <br />3/14/2002 <br />6/9/2003 <br />Blake L. Measom <br />Vice President and Chief Financial <br />Officer <br />6/9/2003 <br />2/6/2004 <br />Officer <br />Mike D. Edmonds <br />Acting Vice President and Chief <br />Officer <br />2/6/2004 <br />4/26/2004 <br />Financial Officer <br />Patricia A. Britton <br />Vice President and Chief Legal <br />Officer <br />3/14/2002 <br />12/6/2004 <br />Officer <br />Patricia A. Britton <br />Assistant Secretary <br />Officer <br />6/9/2003 <br />12/6/2004 <br />Mike D. Edmonds <br />Vice President <br />Officer <br />6/9/2003 <br />2/5/2005 <br />Exhibit 2 -21 Revision Date: 3 /24/09 <br />Revision No.: MR -98 <br />