2010-06-15_REVISION - C1981038 (5)

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2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES - MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. Objectives No answer required. 2.05.1 Operation Plan - Estimated Area (1) Production Methods and Equipment Mining ceased at the Bowie No. 1 Mine on December 4, 1997. Final reclamation of the surface facilities of the underground mine at both the East and the West portals is virtually complete. Facilities associated with the unit train loadout have been removed. Track removal and final grading remains to be complete at the unit train loadout. In 2010, as part of PR-4, Bowie No. 1 will transfer 2,379 acres from their permit boundary to the Bowie No. 2 mine. In addition, Bowie No. 1 agrees that a portion of three Federal Coal Leases will be transferred to the Bowie No.2 Mine. This additional permit area and the Federal Coal Leases will be incorporated into the Bowie No. 2 permit, and will encompass some of the old workings developed from the Bowie No. 1 mine. The Bowie No. 2 Mine has agreed to assume any and all of the liability associated with the old workings that are encompassed by the Bowie No. 2 Mine permit boundary. The revised permit boundaries for Bowie No. 1 and a portion of the new boundary for Bowie No.2 and applicable Federal Coal Leases are shown on Map 9-2. The following provides a historical perspective of the mining that occurred at the East and West Mines. Mining practices were in accordance with the recommendations of the U. S. Bureau of Land Management concerning Maximum Economic Recovery (MER). The mining method employed was room and pillar with partial pillar extraction from both panels and main entries when development was exhausted and mining conditions were practical. The mine workings are shown on Map 2-5 in Volume No. 2. Stipulation "g" Federal coal lease C-37210 stipulation "g" allowed only limited mining within 0 to 600 feet overburden zone depicted on Map 2-5. Additional mining constraints, developed as pillar stability design calculations, apply to the 600 to 800 feet overburden buffer zones also depicted on Map 2-5. These additional constraints were based upon recommendations contained in the June, 1983 subsidence study (Subsidence Appendix, Volume 3) conducted by Geo-Hydro Consulting, Inc. 0 to 600 feet of overburden Only access entries were developed under Stevens Gulch and East Roatcap Creek drainages. Permanent protective pillars were left standing to prevent all surface and subjacent disturbance to the overburden. Protective pillars in these buffer zones are designed to provide safety factors in excess of 2.0 using the Wilson pillar design method. (See Pillar Stability Calculations in Volume 2) PR-4 - 1 - 06/10