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from falling in as the coal is cut. Therefore, the overall recovery of the longwall coal is estimated <br />at 95% of the net coal thickness. <br />4.3 Coal Reserves By Lease <br />Western Fuels has estimated the coal reserves for the Deserado Mine logical mining unit by lease. <br />Reserve estimates have been made for the categories of: coal reserve base, mineable reserve base, <br />' recoverable raw coal reserves, and recoverable clean coal. The category of recoverable raw coal <br />reserves coincides with the category "recoverable coal reserves' as defined in CFR Title 43 <br />Subsection 3480.0-5. However, the shipped product from the Deserado Mine is "recoverable clean <br />coal" for which there is no corresponding category in the Code of Federal Regulations. <br />Western Fuels has identified eight (8) coal seams which are correlatable over at least a portion of <br />the Deserado mine logical mining unit area. Of the eight seams, only coal contained in the B and <br />D Seams is of adequate thickness over enough areal extent to be considered mineable. All reserve <br />' estimates are based on a coal density of 84.24 Ibs/ft' or 1834.75 tons/acre foot. <br />4.3.1 Coal Reserve Base The coal reserve base of the Deserado mine logical mining unit, as <br />defined in CFR Title 43 subsection 3480.0-5, has been estimated for the following eight (8) coal <br />seams: Iles, B Seam, D Seam, E Seam, F Seam, G Seam, H Seam, and the J Seam. Reserves <br />(coal reserve base) were estimated for each of these eight (8) seams using the following criteria: <br />• minimum seam thickness of 28 inches to an elevation 500 feet below the lowest elevation <br />' on the Deserado Mine Logical Mining Unit <br />' • minimum seam thickness of 48 inches from a depth of 500 feet to 3000 feet below the <br />lowest elevation on the Deserado Mine Logical Mining Unit <br />The lowest elevation on the Deserado Mine Logical Mining Unit is 5310 feet above mean sea level. <br />This point is located along the White River in Federal Coal Lease C-0126669. Therefore, the <br />dividing line for minimum seam thickness between 28 inches and 48 inches is where each seam <br />crosses the elevation of 4810 feet above mean sea level. This line is of course the 4810 foot <br />structural contour line on each seam. <br />' Thickness values for each seam (interpreted drill hole geophysical logs and core analysis) were <br />' posted at each drill hole location on individual seam maps and were The basis for the 'coal reserve <br />base° estimate. Isopach maps for each seam were then constructed based on the posted Thickness <br />values. Reserves were estimated for each seam by planimetering the areas of different thickness <br />' delineated by the isopach lines. <br />'• ?b <br />1 <br />