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urrent Officers and Directors <br />as of February 23, 2009 <br />Rio Tinto Western Holdings Limited (fka RTZ Western Holdings Limited) <br />A UK Corporation Incorporated 3/29/1873 <br />Address: 2 Eastbourne Terrace <br />London W2 6LG United Kingdom <br />AVS Entity ID No: 145519 <br />FEIN: UK Co #7132 <br />Director/Officer Name Title <br />Role Appointed <br />Daniel S. Larsen Director Director 1/1/2006 <br />B. Mathews Director Director 8/1/2007 <br />Roger P. Dowding Secretary Officer 2/18/1998 <br />Ulf Quellmann Director Director 4/25/2008 <br />Exhibit 2-28 Revision Date: 3/24/09 <br />Revision No.: MR-98