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