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istorical 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 Title Role Appointed End Date <br />Kent W. Goates Director Director 3/11/2002 3/2/2003 <br />Bret K. Clayton Director Director 3/3/2003 6/9/2003 <br />Blake L. Measom Director Director 6/9/2003 2/6/2004 <br />Patricia A. Britton Director Director 3/11/2002 12/6/2004 <br />Richard E. Pierce, Jr. Director Director 10/2/1996 12/6/2004 <br />Alan Davies Director Director 4/26/2004 4/23/2007 <br />R S Light Director Director 12/6/2004 4/23/2007 <br />Ian C. Ratnage Director Director 10/2/1996 5/1/2008 <br />Christopher Lenon Chairman Director 10/2/1996 12/8/2008 <br />Kent W. Goates Vice President and Chief Financial Officer 3/14/2002 3/3/2003 <br /> Officer <br />Bret K. Clayton Vice President and Chief Financial Officer 3/3/2003 6/9/2003 <br /> Officer <br />Blake L. Measom Vice President/Controller Officer 3/14/2002 6/9/2003 <br />Blake L. Measom Vice President and Chief Financial Officer 6/9/2003 2/6/2004 <br /> Officer <br />Mike D. Edmonds Acting Vice President and Chief Officer 2/6/2004 4/26/2004 <br /> Financial Officer <br />Patricia A. Britton Vice President and Chief Legal Officer 3/14/2002 12/6/2004 <br /> Officer <br />Patricia A. Britton Assistant Secretary Officer 6/9/2003 12/6/2004 <br />Mike D. Edmonds Vice President Officer 6/9/2003 2/5/2005 <br />Exhibit 2-21 Revision Date: 3/24/09 <br />Revision No.: MR-98