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Middle Block (Deadhead Router Mining i dragline will sidebench the first pit on the dragline. This will be accomplished as the The next cut in this area will be accomplish Upper Block. The final cut in this area is e one area to the other. Exact timing of the n Upper and Lower Blocks and may deviate fry the middle block will commence in the fall 1992. The ast side and cast the spoil behind, or to the west, of the iragline moves from the Lower Block to the Upper Block, d as the dragline moves back to the Lower Block from the petted to take place in 1993 on a subsequent move from Wing of this block is subject to the mining operations in the n the above schedule. Coal haulage from this area will be conduct d via Haul Road A and Haul Road G. Haul Road A will be extended to the Upper Block on or near the eadhead Route area as shown on Exhibit 12-2. Upper Block. A box cut will be opened in likely be used to assist the dragline in unc the box cut and possibly the cropline a approaches 90 feet. As stated earlier, th block. The next pit in this area will be in 1 on both sides of the box cut. As with th unforeseen circumstances and the pit seq economic recovery line should be reached ii re center of the upper block in 1992. Scrapers will most ~ering the coal, especially in the northwest (lower) end of on the east side. The overburden depth in this area dragline will alternate between this block and the lower ~3, adjacent to the box cut. Pit progression will take place lower block, this schedule may be deviated to adjust for :nced may vary from that shown on Exhibit 12-2. The 1996. Haulage to and from this area will be on H ul Roads A and G. The empty trucks will proceed to this block up Haul Road A. The loaded trucks w Il travel down Haul Road G. In good weather Haul Road G may be used as both an in and out road. South Block The pit layout in the south bock deviates from the general mining configuration in the areas to the north where the pits are aligne perpendicular to the coal cropline. In the south area, pit configuration is constrained by a steepening of the dip of the coal seam and the resulting rapid increase in overburden depth as mining progresse away. from the cropline. In this area, mine pits and progressive development will occur paralle to the cropline. Development of the south block will proceed directly from the final cut in the to er block. As shown by Exhibit 12-3, a narrow pit will be extended to the south along the Wadge se m cropline from the final pit highwall in the tower block. Given the initial pit configuration, some de elopment material may be moved by scrapers to facilitate partial backfilling of the final cut in the low r block. The pit will be widened and extended further to the south and west, following the Wadge se m outcrop. A box cut will be opened approximately in the middle of the south extension mining area where the outcrop extends around a natural topographic feature. The resulting pit will connect with the main pit with mining continuing to the south and west to the defined reserve limit. Once the fi al highwall is established, augering operations will be conducted and progress to the south, as sh wn on Exhibit 12-3. All aspects of the augering operations are described in Attachment 12-2, Auger Mi ing. As stated previously in the discussion regarding auger mining in the Lower Block, the auger oper tion produced unacceptably low recovery rates; therefore SCC will use a highwall miner coal recovery ystem in place of the auger in the South Block. • • • PR04 ~ 8 Revised 04/04