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illustrates the anticipated sequence of reclamation operations throughout the life-of-operations. <br />i <br />Mining operations will be conducted for recovery of the Wadge seam in the SE%. Section 10, SW'/< Section <br />14, E'/: Section 15, N'/~ Section 22, Section 23, W'/z Section 26, W'/z Section 35, and NY= Section 34, T5N, <br />R88W. Sage CreekM/olf Creek seams will also be mined portions of Section 22, 23, 27, 34 and 35. There <br />are currently no plans for recovery of the Lennox seam in the permit area. <br />Lower Slock. In accordance with the Operations Plan, Exhibit 12-2, a box cut was opened in August 1990 <br />near the center of the mining block (NEY: of Section 22). The dragline proceeded from the erection site to <br />the box cut area by way of Road F. Road F was constructed of sufficient width to allow the dragline to <br />deadhead to the box cut pit area. The orientation of the box cut is roughly perpendicular to the strike of the <br />surface slope. Succeeding cuts were approximately parallel to the box cut and advance towards the <br />northwest and southeast. The area shown on Exhibit 12-2 as "Mined Out" was mined during the time period <br />of 1990 -September, 1998. The mining sequence will be altered somewhat from that shown on Exhibi! 12-2. <br />The slide that occurred at Topsoil Stockpile N has raised additional stability concerns for the topsoil. <br />Therefore, mining will not advance any further towards (northwest) the topsoil stockpile from the current 11-1- <br />93 pit configuration. This will remain in effect until the topsoil stockpile is respread or moved to a new <br />location. This does not affect the pit to the north of the stockpile (upper half of the pit). Mining will continue <br />towards the southeast, as shown on Exhibit 12-2, 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 Pond <br />006 and progress to the east, as shown on Exhibit 12-3. All aspects of the angering operation are described <br />in Attachment 12-2, Auger Mining. The auger mining commenced as planned, however the actual <br />performance and coal production was lower than expected. The auger operation moved from location to <br />location along the "A" Pit final highwall until it was decided to suspend further operations. Exhibit 12-2, <br />Operations Plan, shows the specific areas where auger mining was conducted. <br />Based on the past performance of the auger mining, SCC decided to use a highwall miner coal <br />recovery system in place of the auger, The highwall miner was expected to have ahigher in-place <br />recovery rate and deeper seam penetration than experienced with the auger system. However, based <br />on disappointing results of highwall mining at the Yoast Mine, it was decided not to proceed with <br />highwall mining plans. The remaining recoverable reserves will be mined with the 770 dragline. <br />It should be pointed out that scrapers may be used in cropline areas to either strip or pre-strip a pit for the <br />dragline. This procedure will be conducted in areas where disturbance beyond the cropline is to be avoided <br />due to sediment control restraints or to prevent spoiling into a drainage. This will complete mining in this <br />block. <br />i <br />PR-OS 7 Revised 05/05 <br />