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Plate 9 (included by reference) is an overburden thickness map to the top of the D Seam. From <br />Plate 9, the overburden varies from zero along the D Seam outcrop to over 2000 feet in the extreme <br />northeast corner of Federal coal lease COC-51551. <br />The B Seam is complicated by major splits which separate the B Seam into two basic areas within <br />the LMU which can be considered mineable. The easterNsoutheastern area occupies the eastern <br />part of lease C-023703, lease D-047201, lease C-0126669 and lease COC 51551. The <br />' northwestern area occupies the northwestern portion of lease C-023703 and all of leases C-8424 <br />and C-8425. In the eastern/southeastern area, major splits and/or non-deposition have resulted <br />in only the upper portion of the B Seam being mineable. In the northwestern area, the lower portion <br />of the seam is predominate and major splits and/or non-deposition has rendered most of the upper <br />portion of the seam not mineable. There are, however, areas in the northwestern area in which the <br />' entire seam is mineable. An east west zone of non-deposition and thin coal (less than 4 feet thick) <br />separate the northwest area (lower and upper mineable coal) from the southeast area (only upper <br />B coal mineable). Plate 10 is an isopach map of the mineable B Seam. The southeast area Upper <br />B coal, the northwest area where only the lower B Seam is mineable, and the area in which the <br />entire seam is mineable are delineated by separate hatchings. The area of thin coal and <br />' non-deposition which separates the two areas is not hatched. The cross sections previously <br />presented in Section 3.0 (Plates 4, 5 and 6) illustrate the splits and areas of non-coal deposition <br />which affect the mineability of the B Seam. The location of the cross sections are shown on Plate <br />3. <br />Plate 11 is an isopach map of the interburden thickness between the mineable B Seam and the <br />mineable D Seam. A large portion of lease C-8424 is not mapped because mineable D Seam <br />does not exist in that area. Plate 12 is the isopach map of the mineable D Seam. Although some <br />' partings and splits occur in the D Seam, they are minor in comparison to the B Seam splits. <br />The °mineable reserve base' for the B and D Seams was estimated by planimetering the mineable <br />B and D Seam isopachs within the boundaries discussed previously. Table 4-5 is a summary by <br />lease of the mineable reserve base of the B and D Seams. <br />' 4.3.3 Recoverable Raw end Clean Coal Reserves The 'recoverable coal reserves' of the <br />Deserado Mine Logical Mining Unit as defined in the Code of Federal Regulations is the remaining <br />raw coal tonnage which is expected to be produced in accordance with the B and D Seam mine <br />plans. This reserve category is herein referred to as recoverable raw coal reserves to differentiate <br />this category from clean coal reserves. Clean coal reserves are actually the expected saleable coal <br />' product from the Deserado mine in accordance with the B and D Seam mine plans. Total recovered <br />• Gean coal production to 12/31/96 from the Deserado Mine was 12.964 million tons. <br />' 29 <br />t <br />