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• thickness minus the thickness of any partings. Therefore, recoverable raw coal reserves in the D <br />Seam are based on net coal thickness. D Seam clean coal reserves are 98% of the D Seam raw coal <br />reserves. Recoverable raw coal reserves in the B Seam are based on the net coal thickness and do <br />not include parting thickness. The B Seam clean coal recovery is predicted to be 98 percent. <br />Because of thin interburden and better reserves in the D Seam, no coal will be recovered from the B <br />Seam in leases C-0126669 and C-44693. <br />• <br /> <br />"Recoverable clean coal reserves" in the B Seam are estimated at about 23.85 million tons. <br />"Recoverable clean coal reserves" in the D Seam are estimated at about 3.83 million tons. The total <br />remaining recoverable clean coal reserves in the B and D Seams for the current Mine Plan is about <br />27.68 million tons. <br />II.B.6.d Coal Quality The rank of Deserado Mine coal is on the border of subbituminous A and high <br />volatile C bituminous (ASTM Standard D-388-77). However, (using the "Parr Formula" to calculate <br />the moist, mineral matter free, calorific value) the D Seam coal and the average of the D Seam and <br />B Seam is of high volatile C bituminous rank. Sulfur content in the lease area is low, averaging 0.41% <br />and ash content is moderate to high, averaging 14.12%. Composite proximate analyses on an as <br />received, thickness weighted basis for the B Seam and D Seam mineable intervals are summarized <br />in Table II.B-2. The raw coal (run-of--mine) is washed in the Deserado Mine preparation plant. The <br />prep plant removes the out of seam dilution (non-coal material from roof and floor) as well as in seam <br />partings. The weighted average clean coal product for 1998 had 13.02% moisture, 10.09% ash, <br />0.44% sulfur and a heating value of 10359 BTUAb on the as-received basis at the power plant. quring <br />1995, a bypass to the preparation plant was constructed. This allows shipping relatively low ash coal <br />without washing. <br />Laboratory analysis of nine samples of the D Seam and seven samples of the B Seam indicate <br />average sulfur content of the seams is broken down as follows: <br /> D SEAM B SEAM <br />Sulfate <0.01% 0.01% <br />Pyrite <0.03% 0.07% <br />Organic <0.40% 0.30% <br />TOTAL 0.43% 0.38% <br />These figures are representative of the sulfur content of the seams throughout the lease area. <br />(Permit Renewal #3 1/99) <br />I I. B-11 <br />