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6.0 M.4aQMUM ECONOMIC RECOVERY <br />' The Deserado Mine is planned for a maximum economic recovery within the constraints of safety and <br />existing technology. L.ongwall mining has been planned to the greatest extent possible since this method <br />allows virtually 100 percent extraction of the panels. Room-and-pillaz mining is planned for those <br />azeas where longwall mining is not practical. 'IIJe pillars in these panels will also be partially extracted <br />as long as it could safely be done. An overall extraction rate of 64 percent is expected from the <br />room-and-pillaz panels. <br />It has been stated that coal less than 4 feet in thickness or under less than 100 feet of overburden is <br />considered unmineable for the reason of safety and equipment constraints. <br />Plates 7 and 8 show a number of other azeas left unmined which would otherwise be mineable under <br />the thickness and overburden criteria. These areas aze not mined for one or more of the following <br />reasons. <br /> 1. No mining in azeas 100-feet from the 100-yeaz flood plane. This boundary is shown in <br /> Section 11 of the mine plans. <br /> 2 i <br /> . No m <br />ning where the reject percentage is expected to exceed 50 percent unless it is necessary <br /> for mine development. Such azeas aze mazked in both the D and B Seam mine plans. <br />' <br /> 3. No multiple seam mining where the interburden between D and B Seams is less than 10 feet. <br /> Such azeas aze shown in Section 33 of the D Seam mine plan and Sections 2, 4 and 11 of the <br /> B Seam mine plan. Mining in such azeas is planed only in the B Seam in Section 33, and <br /> only in the D Seam in Sections 2, 4 and 11. <br /> <br /> 4. No room-and-pillaz mining in D Seam if longwall mining is planned underneath in the B <br />' Seam. Only longwall mining is planned in the D Seam if there is longwall mining planed <br /> underneath in the B Seam. If ]ongwall in the D Seam is not practical, or economically feasible, <br /> or it jeopazdized relatively better reserves in the B Seam, the azea in question is left unrnined. <br /> <br /> 5. No B Seam mining in the lease COC 51551 is planned since this coal cannot be economically <br /> mined unles the azea to the west of this lease is further explored, proved to contain recoverable <br /> coal and leased from the federal government. <br /> <br />1 37 <br />1 <br />