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West Elk Mine <br />• assumptions, WWE calculated a "fill time" for the mine (including the Apache Rocks mining <br />azea) of 2,110 yeazs, again assuming no seepage or outflow. <br />This "time to fill" calculation was based on the following information and assumptions: <br />• B Seam mining thickness (12 ft.); <br />• E Seam mining thickness (11 ft.); <br />• Approximate Current (1996) Mining Area (B Seam) -Longwall Panels (23,020,000 ft.Z) and <br />Development Areas (16,370,000 ft.1); <br />• Approximate Apache Rocks MininPP Area (B Seam) -Longwall Panels (57,403,750 ft.z) and <br />Development Areas (19,854,250 ft`); <br />• <br />• <br />2.05-258 Revised June 1005 PRIO; Rev. March 1006; Rev. May 2006 PRlO <br />