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R. <br />,- <br /> <br />v' <br />HIGHWALL MINING GROUND CONTROL PLAN ADDENDUM: <br />Seneca IIW and Yoast Areas <br />Seneca Coal Company <br />Seneca Mine <br />MS13A I.D. #OS-00304 <br />Routt County, Colorado <br />• <br />• <br />March 15, 2004 <br />