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urrent Officers and Directors <br />as of February 23, 2009 <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 <br />Role Appointed <br />Kevin L. Baker Director Director 12/6/2004 <br />Michael C. Barrett Director Director 4/23/2007 <br />Kay G. Priestly Director Director 4/23/2007 <br />Ulf Quellmann Director Director 5/1/2008 <br />Kevin L. Baker Chief Legal Officer Officer 3/12/2007 <br />Michael C. Barrett Vice President and Chief Financial Officer Officer 4/23/2007 <br />Ulf Quellmann Vice President Officer 5/1/2008 <br />Shannon S. Crompton Secretary Officer 3/30/1999 <br />R. J. Schlenker Controller Officer 7/26/2007 <br />Ulf Quellmann Treasurer Officer 5/1/2008 <br />Exhibit 2-20 Revision Date: 3/24/09 <br />Revision No.: MR-98