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<br />4.3.2 Mineable Reserve Base Western Fuels has estimated the "mineable reserve base" as defined <br />in CPR Title 43-SS3480.0-5 for coal contained in only the B and D Seams. Coal in the other six <br />seams is thin and limited in azeal extent and therefore is not considered mineable. Mineable coal in the <br />B and D Seams includes: <br />' • Mineable seam thickness equal to or greater than four feet <br />' • Coal with more than 100 feet of overburden <br />In addition, a 50 foot bartier pillaz around the exterior boundary of the Deserado Mine Logical Mining <br />' Unit was excluded as was the area within 100 feet of the 100-year flood plain of the White River. The <br />abandoned Staley-Gordon mine was also excluded from the mineable reserves for the D Seam. <br />' Plate 9 in the pocket of this report 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 comer of Federal coal lease COC-51551. <br />The 13 Seam is complicated by major splits which separate the B Seam into two basic areas within the <br />LMU which can be considered mineable. The eastem/southeastem area occupies the eastern part of <br />lease C-023703, lease D-047201, lease C-0126669 and lease COC 51551. The northwestern azea <br />occupies the northwestern portion of lease C-023703 and all of leases C-8424 and C-8425. In the <br />eastetn/southeastem area, major splits and/or non-deposition have resulted in only the upper portion <br />of the: B Seam being mineable. In the northwestern area, the lower portion of the seam is predominate <br />and rnajor splits and/or non-deposition has rendered most of the upper portion of the seam not <br />mineacble. There are, however, areas in the northwestern area in which the entire seam is mineable. <br />' An east west zone of non-deposition and thin coal (less than 4 feet thick) separate the northwest azea <br />(lower and upper mineable coal) from the southeast area (only upper B coal mineable). Plate 10 is an <br />isopach map of the mineable B Seam. The southeast area Upper B coal, the northwest azea where only <br />the lower B Seam is mineable, and the azea in which the entire seam is mineable aze delineated by <br />sepazate hatchings. The area of thin coal and non-deposition which separates the two azeas is not <br />' hatched. The cross sections previously presented in Section 3.0 (Plates 4, 5 and 6) illustrate the splits <br />and areas of non-coal deposition which affect the mineability of the B Seam. The location of the cross <br />sections are shown on Plate 3. <br />Plate 11 is an isopach map of the interburden thickness between the mineable B Seam and the mineable <br />D Sewn. A lazge portion of lease C-8424 is not mapped because mineable D Seam does not exist in <br />that area. Plate 12 is the isopach map of the mineable D Seam. Although some partings and splits <br />occur in the D Seam, they are minor in comparison to the B Seam splits. <br />31 <br /> <br />