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2005 Subsidence and Geologic Field Observations <br />Box Canyon, West Flatiron, Apache Rocks, <br />and Sou[h of Divide Minino Areas <br />5.0 SOUTH OF DIVIDE MINING AREA <br />General Mining Plan for the E-Seam <br />Twelve longwall mining panels (El through E12) are currently planned for mining the E-Seam in <br />the South of Divide mining area (Maps 2 and 4). Each panel will extract between 8 to 14 feet of <br />coal. <br />• Longwall panels El through E4 are located generally east of Minnesota Reservoir in the <br />area of the Dry Fork road and the Deep Creek Ditch trans-basin diversion. <br />• Longwall panels ES through E8, which are separated from panels El through E4 by a <br />200-foot barrier, are located southward to the Lick Creek drainage. <br />• Longwall panel E9 is located south of Minnesota Reservoir. <br />• Longwall panels E10 through E12 are located in the western part of the Apache Rocks <br />mining area 200 to 250 fee[ stratigraphically above parts of mined longwall panels 12, 13, <br />and 13A. <br />General Mine Design <br />The design plan is similar to the one in the B-Seam (Map 2). The coal will be mined by the <br />longwall retreat method. With the exception of the tailgate entries of panels El, E5, E9, and <br />E12, the longwall panels will be separated by two rows of gate road pillars. Under the current <br />plan, the row nearest to the headgate side of the panels is planned to be on 125 by 200 foot <br />centers. The row of pillars on the tailgate side will be on 75 by 200 foot centers. Longwall <br />panels El through E8 trend roughly N80°W, are roughly 1,100 feet wide, and range in length <br />from about 9,000 to 11,000 feet. Panel E9 is about 1,100 feet wide and trends approximately <br />N10°E. Longwall panels E10 through E12 trend east to west, are 1,150 feet wide, and range in <br />length from approximately 4,000 to 5,500 feet. <br />831-032.710 Wright Water Engineers, Inc. Page 35 <br />November 2005 <br />