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Date & Place June 9, 2006; Delaware <br />Incorporated: <br />Rio Tinto White Horse Company is a wholly owned subsidiary of: <br />Name: Rio Tinto America Inc. <br />Address: 505 South Gillette Avenue <br />Caller Box 3009 <br />Gillette, WY 82717 -3009 <br />FEIN: 11- 3359689 <br />Date & Place June 27, 1973; Delaware <br />Incorporated: <br />Rio Tinto America Inc. is a wholly owned subsidiary of: <br />Name: Rio Tinto America Holdings Inc. <br />Address: 505 South Gillette Avenue <br />Caller Box 3009 <br />Gillette, WY 82717 -3009 <br />FEIN: 13- 3504538 <br />Date & Place January 19, 1989; Delaware <br />Incorporated: <br />Rio Tinto America Holdings Inc. is owned by two entities, Rio Tinto Western Holdings <br />Inc. (51.50 %) and RTAH LLC (48.50 %): <br />Name: Rio Tinto Western Holdings Limited <br />Address: 2 Eastbourne Terrace <br />London W2 6LG <br />United Kingdom <br />ID No.: U.K. Company # 7132 <br />Date & Place March 29, 1873; England <br />Incorporated: <br />Name: RTAH LLC <br />Address: 505 South Gillette Avenue <br />Caller Box 3009 <br />Gillette, WY 82717 -3009 <br />Exhibit 2 -4 Revision Date: 3/24/09 <br />Revision No.: MR -98 <br />