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~ Y <br />' 6. Geometric constraint. Because of the difficulty encountered with prominent deaf, the mains are not <br />planned to be driven parallel to the lease boundary. This leaves a number of unmined triangular areas <br />' near the lease boundary. <br />7. Barrier pillars and pillars left in place. Barrier pillars are planned around room-and-pillar panels and <br />longwall sections. They will not be extracted. Furthermore, pillars in the mains, gate roads and <br />' room-and-pillar panels (after retreat) will not be extracted. <br />8. Areas not minetl within the year 2032. The last year of operation is 2032 when longwalls and room- <br />' and-pillar panels are completely mined out. Mining could, however, continue with both the longwalls <br />and continuous miners if addifional parcels of the Prairie Dog Tract is leased and mine planning done <br />for the entire area. <br />9. Coal unminable due to the Deserado Mine fire of January 31, 1996. Approximately 5,706,000 tons <br />of recoverable oval were lost tlue to seals placed to contain the mine fire. <br />t <br /> <br /> <br /> <br /> <br />' (Rev. 6/3/96) <br /> <br /> <br /> <br /> <br /> <br /> <br />