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• were delineated by the isopach maps. Area multiplied by thickness multiplied by the density factor <br />of the coal is equal to the weight of reserves. The "coal reserve base" of the B Seam is approximately <br />123.3 million tons. The D Seam "coal reserve base" is approximately 82.6 million tons. <br />II.B.6.b Mineable Reserve Base is a category of reserves which defines only the coal reserves in <br />which mining activity is feasible. Mineable reserve base coal must meet the following criteria: <br />• Coal with 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 barrier pillar 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 />area of the abandoned Staley-Gordon mine was excluded for both the D and B seams. <br />The "mineable reserve base" of the B Seam is approximately 89.74 million tons. The "mineable <br />reserve base" of the D Seam is about 66.19 million tons. The methods of estimating the "mineable <br />reserve base" are the same as those used to determine the "coal reserve base." Maps 132 and 133 <br />are isopachs of the Mineable B Seam and Mineable D Seam respectively. <br />II.B.6.c Recoverable Raw and 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 plans. <br />The D-Seam mine plan has been changed because of the fire in the tailgate of longwall panel 9. This <br />reserve category is herein referred to as recoverable raw coal reserves to differentiate this category <br />from clean coal reserves. Clean coal reserves are actually the expected saleable coal product from <br />the Deserado mine in accordance with the B and D Seam mine plans. Total recovered clean coal <br />production to 11/23/98 from the Deserado Mine was 16.06 million tons. <br />The recoverable raw coal reserves for the B and D Seams is the "mineable reserve base" minus the <br />coal left in place for support (such as pillars, fenders, barrier pillars, etc) and minus the coal which <br />cannot be mined economically or technically, and minus the coal already recovered. <br />The B and D Seam mine plans (Maps 119 and 120) show the areas to be mined. The seam with larger <br />clean coal reserve potential in the areas of thin interburden (less than 10 feet) was given priority and <br />recovery from that seam is planned. Coal in the seam with the least potentially recoverable clean coal <br />reserves in areas of thin interburden is considered non-recoverable. The recoverable raw coal <br />reserves" are estimated at about 25.11 million tons for the B Seam and at about 4.07 million tons for <br />the D Seam. <br />. Experience with mining and washing the D Seam coal at the Deserado Mine indicates that clean coal <br />recovery is 98% of the net coal thickness in the D Seam where net coal thickness is the D Seam <br />(Permit Renewal #3 1199) II.B-10 <br />