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YVest Elk Mine <br /> <br />Because the coal benches split neaz the mazgins of the coal deposit, the B Seam ranges in total <br />thickness (B1, B2, and B3) from 1.5 feet to 16.5 feet across the coal lease area (Map 13). Those <br />areas where B Seam splitting, parting thickening, or coal bench thinning may preclude or limit <br />the economic recovery of the reserve, using current longwall technology, are identified (Map <br />13). In the permit area, the thickness of the B Seam reserve is highly variable because the upper <br />and lower coal benches (B1 and B2) are split by both the Ml and M2 partings in an irregular <br />manner. In this azea the B Seam ranges from 1.0 feet to 16.5 feet in total thickness. Map 12 <br />shows the combined total thickness of the B 1 and B2 coal benches. <br />B Seam Reserves <br /> <br /> <br />Reserves for the B-Seam at year-end 2003, are tabulated in Table 3 for the remaining Box <br />Canyon Iease reserves. Because the combined thickness of the Bl and B2 coal benches can <br />exceed the maximum mineable thickness, a 12 foot maximum mining height is assumed for this <br />area. The maximum mineable thickness is controlled by operational and safety factors. The <br />reserve estimate is based upon current mining plans. <br />a e a ea a eserves ons <br /> <br />Reserves Leased To Be Leased Total <br />B Seam 25 2 * 27 <br />E Seam 66 13** 79 <br />Total 91 15 106 <br />* West Flatiron Lease <br />** Proposed Dry Fork LBA <br />The combined thickness of the B1 and B2 coal benches for the remaining Box Canyon lease <br />reserves can exceed the maximum mineable thickness, therefore, a 12 foot maximum mining <br />height is assumed for this area. The maximum mineable thickness is controlled by operational <br />and safety factors. <br />2.04-24 Revised November 2004 PRlO <br />