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box cut and advance towards the northwest and southeast. The area shown on Exhibit 12-2 as "Mined <br />• Out" was mined during the time period of 1990 -September, 1998. The mining sequence will be <br />altered somewhat from that shown on Exhibit 12-2. The slide that occurred at Topsoil Stockpile N has <br />raised additional stability concerns for the topsoil. Therefore, mining will not advance any further <br />towards Inorthwestl the topsoil stockpile from the cu«ent 11-1-93 pit configuration. This will remain <br />in effect until the topsoil stockpile is respread or moved to a new location. This does not affect the pit <br />to the north of the stockpile (upper half of the pit). Mining will continue towards the southeast, as <br />shown on Exhibits 12-2 and 12-3, until the recovery line is reached in the year 2000. <br />Auger mining will then commence in the spring of 2000 at the far west end of the final highwall near <br />Pond 006 and progress to the east, as shown on Exhibit 12-3. Att aspects of the angering operation <br />are described in Attachment 12-2, Auger Mining. The auger mining commenced as planned, however <br />the actual performance and coal production was lower than expected. The auger operation moved <br />from location to location along the "A" Pit final highwall until it was decided to suspend further <br />operations. Exhibit 123, Operations Plan, shows the specific areas where auger mining was <br />conducted. <br />Based on the past performance of the auger mining, SCC has decided to use a highwall miner coal <br />recovery system in place of the auger. The highwall miner is expected to have a higher in-place <br />recovery rate and deeper seam penetration than experienced with the auger system. The highwall <br />• mining is planned to commence operation in 2005. The Wadge seam is the only seam to be highwall <br />mined in "A" Pit area as shown on Exhibit 12.3, Operations Plan (Combined Mine Plan) and Exhibit 12- <br />3a, Operations Plan (Wadge Seam and Highwall Minerl• The proposed highwall miner operation is <br />further discussed in Attachment 12-4, Highwall Mining. <br />It should be pointed out that scrapers may be used in cropline areas to either strip or pre-strip a pit for <br />the dragline. This procedure will be conducted in areas where disturbance beyond the cropline is to be <br />avoided due to sediment control restraints or to prevent spoiling into a drainage. This will complete <br />mining in this block. <br />Coal haulage in this block will be conducted on the Mine Entrance Road and (Haul Roads A, F, and H.1 <br />The empty trucks will be brought into the mine site via the Mine Entrance Road and then traverse Haul <br />Road A and, in some cases, into the pit area. From Haul Road A or H, the trucks will branch off to in- <br />pii ramps, depending on the location of coal loading operations. The coal beneath a portion of Haul <br />Road A will not be recovered until 1995 as shown on Exhibit 12-2. This will allow access to the upper <br />block of coal to remain open. The loaded trucks will continue through the pit area and down Haul Road <br />F to the Mine Entrance Road. Weather or unanticipated production problems may cause some deviation <br />of the haulage scheme and loaded trucks may be brought back down Haul Road A. <br />• Although Haul Roads B and C may never be constructed, they will remain a part of this plan. In the <br />event chat unforeseen problems arise with the proposed haulage system, roads B antl/or C may have to <br />be constructed as alternate routes. <br />PR04 7 Revised 04/04 <br />