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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`d 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 the
<br />northwest, off the 6 -North Mains, to support development and mining of Panels 18 -Right through 23 -Right in the
<br />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 -North Mains were extended
<br />approximately 1,200 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 24 -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 final panel, Panel
<br />25 -Right was eliminated. In order to provide adequate ventilation airflow for both the northern portion of the NMD
<br />and future development of the WMD, a new intake ventilation air shaft was established over the 6 -North Mains
<br />intersection. The shaft is equipped with an emergency escape hoist and ventilation air heater, and other mine infra-
<br />structure (electrical substation and power -drop boreholes, mine dewatering borehole and surface storage facilities,
<br />rock -dust storage tank and borehole, compressor station and compressed air borehole, and bulk -material drop
<br />borehole) has been established to serve both the Northern and Western Mining Districts.
<br />To support development and mining of the WMD, the 6 -North Mains were extended approximately 600 feet further
<br />to the west, and the new 9- and 10 -North Mains were extended approximately 6,900 feet to the southeast to connect
<br />back to the 3 -North Mains. Panels 12 -Left through 17 -Left, and the 13- and 14 -Left Outby Panels will be
<br />developed from the 6 -North Mains extension, and the 9- and 10 -North Mains. Development and mining of the
<br />WMD will be phased; with initial development (Phase I) of sub -mains and head -gate and tailgate entries for Panels
<br />17- and 19 -Left previously approved under TR07-63; development of the the 9- and 10 -North Mains and remaining
<br />head -gate and tail -gate entries up to the limits of the pending federal coal lease under Phase II (TR08-64); extension
<br />of Panels 16- and 17 -Left and associated bleeder entries to their western limits under Interim Phase III; and
<br />remaining panel development, mining of the WMD, and construction of required surface facilities under Phase III,
<br />which is addressed by PR09-08, PR12-09, and TR09-71 to the approved permit. Panel widths in the WMD will be
<br />maintained at approximately 1,000 feet (with the exception of Panels 19- and 20 -Left, which if developed and
<br />mined, will be approximately 800 feet wide), and panel lengths will vary up to approximately 20,000 feet.
<br />Approximately 45,000 feet of mains are expected to be driven over the life -of -mine.
<br />TR13-82 2.05-13 02/28/13
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