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West Elk Mine <br />east and north to develop to the existing shaft ventilation facilities. Mining plans do not <br />include longwall mining reserves in an area northwest of the South of Divide permit area <br />addition, over B Seam Longwall Panels Nos. 12, 13, and 13A, currently situated in the <br />existing permit area, to avoid potential subsidence effects on Minnesota Creek Reservoir <br />and landslides within the Dry Fork drainage. <br />E Seam Overburden and Interburden <br />E Seam overburden (Map 19), ranges in thickness from zero at the outcrop to about 1,200 feet in <br />the east central part of the permit area. Average overburden thickness is about 800 feet <br />within the West Elk Mine permit area. <br /> <br />• <br />2.04-29 Revised November 2004 PRIO <br />