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8. The spacing between highwall miner entries are addressed in SCC's MSHA Highwall • Mining Ground Control Plan, Attachment 12-3. The pillar design is based on a safety factor of 1.5. 9. Should the active opening being mined intersect the previous opening, the highwall miner will pull out immediately at that point, skip the next adjacent hole and then continue to highwall mine again. 10. Highwall miner openings shall be blocked with spoil or other suitable material before they are abandoned. A maximum of 15 previously highwall mined holes will be left open for visual monitoring of any pinching or squeezing of the web pillars. • 5.2 PRODUCTION SCC has estimated the following production and recovery for the highwall mining operation: HIGHWALL MINING SUMMARY Year Yoast Highwall Mining Tons Seneca II-W Highwall Mining Tons Total Highwall Mining Tons 2004 530,000 0 530,000 2005 130,000 886,850 1,016,850 2006 0 960,100 960,100 2007 60,000 979,840 1,039,840 2008 536,090 251,620 787,710 Totals 1,256,090 3,078,410 4,334,500 5.3 RECLAMATION As the final coal removal operation, areas where highwall mining will be used are considered active pits until highwall mining operations are completed. Once highwall mining operations are initiated in a given area, it is anticipated that highwall mining will be completed for that area within a general timeframe of 4-12 months. The duration of highwall mining operations may vary due to variations in coal characteristics, ground conditions, general operating conditions, and highwall miner penetration. Obviously, if highwall miner penetration is limited to 600' or less, the duration of highwall mining operations in a given area will be shorter than if maximum penetration of 1,000' is achieved. On completion of highwall • mining operations in a given area, SCC will proceed with reclamation activities under the approved reclamation plans. The only instances where reclamation may be deferred following completion of highwall mining would be areas where haul roads in spoil areas must be retained until mining of associated areas is completed. TR-25 12-2-6 Revised 09/04