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Right), the Foidel Creek Mine Union Pacific railroad spur (Panels 7 -Right through 10- Right), and several <br />powerlines were undermined and subsided without any significant damage. Both a mine dewatering borehole and a <br />new ventilation shaft and escape hoist were established from the 10 -Right longwall panel to support future mining <br />operations in the NMD. <br />On intercepting one of the two major identified fault zones within the coal reserve area, the main entries were <br />turned to the northeast and the 3` North Mains were extended approximately 4,000 feet, ramping up through the <br />fault zone. Where the main entries intercepted the coal seam on the east side of the fault, the mains were turned <br />back to the northwest and the 5' North Mains were extended approximately 6,000 feet to develop the NMD. As an <br />extension the 3` North Mains, the 4' North Mains were developed, and the head -gate and tailgate entries for <br />Longwall Panel 12 were driven from the 4' North Mains to initiate development of the NMD. During initial <br />development of the NMD, a 300 -foot barrier pillar was established between the Eastern and Northern Mining <br />Districts. From the fault- crossing, sub -mains were progressively developed to the east - northeast off the 5' North <br />Mains for Panels 13 -Right through 17- Right. In this portion of the NMD, panel widths were expanded to <br />approximately 1,000 feet, and panel lengths extended up to 16,000 feet. To maintain adequate ventilation airflows, <br />a new ventilation shaft was established off the 5' North Mains, in -line with the 15 -Right Longwall Panel. During <br />mining of Panels 12 -Right through 17- Right, a portion of Foidel Creek (Panel 12- Right), a portion of Fish Creek <br />(Panels 13 -Right through 17- Right), the Foidel Creek Mine Union Pacific railroad spur (Panels 12 -Right through <br />17- Right), and several powerlines were undermined and subsided without any significant damage. <br />At the northern limit of Panel 17, the Mains were turned back to the west, and the 6' North Mains were extended <br />approximately 2,400 feet, both in preparation for future development of the WMD, and to maintain maximum panel <br />length for mining of the remainder of the NMD. The 7' North Mains were extended approximately 7,500 feet to <br />the northwest, off the 6' North Mains, to support development and mining of Panels 18 -Right through 23 -Right in <br />the NMD. Panel widths in this portion of the NMD have been maintained at approximately 1,000 feet, and panel <br />lengths vary up to approximately 14,000 feet. Continuing development of mine ventilation facilities, to maintain <br />adequate ventilation airflow, included construction of a new ventilation intake shaft, equipped with an emergency <br />escape hoist and ventilation air heater, on the eastern end of the 18 -Right Longwall Panel. <br />At roughly the center of Panel 23- Right, the mains were turned to the north, and the 8 1h North Mains were extended <br />approximately 3,000 feet to the northern limit of the mineable coal reserves. Development and mining of the NMD <br />will be completed with mining and recovery of the remaining coal reserves in Panels 23 -Right through 25- Right. <br />Given decreasing panel lengths for Panels 20 -Right through 25- Right, increasing grades as the coal seam turns up <br />along the margins of the reserve area, and associated ground control and coal quality issues, the potential exists that <br />the final panels (Panels 24 -Right and 25- Right) may be only partially mined or eliminated. In order to provide <br />adequate ventilation airflow for both the northern portion of the NMD and future development of the WMD, a new <br />intake ventilation air shaft was established over the 6 -North Mains intersection. The shaft is equipped with an <br />emergency escape hoist and ventilation air heater, and other mine infra - structure (electrical substation and power - <br />drop boreholes, mine dewatering borehole and surface storage facilities, rock -dust storage tank and borehole, <br />compressor station and compressed air borehole, and bulk - material drop borehole) has been established to serve <br />both the Northern and Western Mining Districts. <br />To support development and future mining of the WMD, the 6' North Mains will be extended approximately 600 <br />feet further to the west, and the new 9 1h and 10' North Mains will be extended approximately 6,900 feet to the <br />southeast to connect back to the 3` North Mains. Panels 13 -Left through 17 -Left will be developed from the 6' <br />Main North extension, and the 9 1h and 10 "' North Mains. Development and mining of the WMD will be phased; <br />with initial development (Phase 1) of sub -mains and head -gate and tailgate entries for Panels 17- and 18 -Right <br />previously approved under TR07 -63; development of the the 9' and 10' North Mains and remaining head -gate and <br />tail -gate entries up to the limits of the pending federal coal lease under Phase II (TR08 -64); extension of Panels 17- <br />and 18 -Right and associated bleeder entries to their western limits under Interim Phase III; and remaining panel <br />development, mining of the WMD, and construction of required surface facilities under Phase 111, which will be <br />addressed by a future revision (PR09 -08) to the approved permit. Panel widths in the WMD will be maintained at <br />approximately 1,000 feet, and panel lengths will vary up to approximately 20,000 feet. Approximately 45,000 feet <br />of mains are expected to be driven over the life -of -mine. <br />TR09 -68 2.05 -13 07/14/09 <br />