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Historical Officers and Directors <br />For the Period of December 2006 to December 2011 <br />Rio Tinto White Horse Company <br />I Michael Beck <br />Director <br />Director <br />111!2009 <br />11/30/2011 <br />James P. Berson <br />Director <br />Director <br />1/1/2009 <br />11/3012011 <br />Ed Moyer <br />Director <br />Director <br />10/1/2010 <br />11/30/2011 <br />J. Michael Beck <br />Chief Financial Officer <br />Officer <br />I/l/2009 <br />11/30/2011 <br />James P. Berson <br />President & Chief Executive <br />Officer <br />1/1/2009 <br />11/30/2011 <br />Officer <br />Franck Berimm <br />Assistant Treasurer <br />Officer <br />9/l/2009 <br />11/30/2011 <br />Bernd Beyer <br />Treasurer <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Shannon S. <br />Secretary <br />Officer <br />9/6/2006 <br />11/30/2011 <br />Cron:pton <br />Mark W. Roberts <br />Director Commercial Planning & <br />Officer <br />1/1/2009 <br />11/30/2011 <br />Business Development <br />Jack R. Welch <br />Assistant Treasurer <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Oliver <br />Assistant Treasurer <br />Officer <br />9/1/2009 <br />11/30/2011 <br />Wolfensberger <br />Chris J. Wykstra <br />Assistant Treasurer <br />Officer <br />9/6/2006 <br />11/30/2011 <br />Ed Moyer <br />Operating Officer <br />Officer <br />10/1/2010 <br />11/30/2011 <br />Alan Davies <br />Director <br />Director <br />9/6/2006 <br />1/31/2007 <br />Jeff Price <br />Director <br />Director <br />9/6/2006 <br />3/1/2008 <br />Colin S. Marshall <br />Director <br />Director <br />9/6/2006 <br />3/1/2008 <br />James P. Orchard <br />Director <br />Director <br />3/12008 <br />1/1/2009 <br />Michael Barrett <br />Director <br />Director <br />1/31/2007 <br />1/1/2009 <br />Exhibit 2-19 <br />Revision Date: 4/7/17 <br />Revision No.: RN -07 <br />