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2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES - MINIMUM <br />REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />• Objectives <br />No answer required. <br />2.05.1 Operation Plan - Estimated Area <br />(1) Production Methods and Equipment <br />Mining ceased at the Bowie No. 1 Mine on December 4, 1997. Final reclamation of the <br />surface facilities of the underground mine at both the East and the West portals is <br />virtually complete. Facilities associated with the unit train loadout have been removed. <br />Track removal and final grading remains to be complete at the unit train loadout. <br />In 2010, as part of PR -4, Bowie No. 1 will transfer 2,379 acres from their permit boundary <br />to the Bowie No. 2 mine. In addition, Bowie No. 1 agrees that a portion of three Federal <br />Coal Leases will be transferred to the Bowie No.2 Mine. This additional permit area and <br />the Federal Coal Leases will be incorporated into the Bowie No. 2 permit, and will <br />encompass some of the old workings developed from the Bowie No. 1 mine. The Bowie <br />No. 2 Mine has agreed to assume any and all of the liability associated with the old <br />workings that are encompassed by the Bowie No. 2 Mine permit boundary. The revised <br />permit boundaries for Bowie No. 1 and a portion of the new boundary for Bowie No.2 and <br />applicable Federal Coal Leases are shown on Map 9 -2. <br />The following provides a historical perspective of the mining that occurred at the East <br />• and West Mines. <br />Mining practices were in accordance with the recommendations of the U. S. Bureau of <br />Land Management concerning Maximum Economic Recovery (MER). The mining <br />method employed was room and pillar with partial pillar extraction from both panels and <br />main entries when development was exhausted and mining conditions were practical. <br />The mine workings are shown on Map 2 -5 in Volume No. 2. <br />Stipulation "g" <br />Federal coal lease C -37210 stipulation "g" allowed only limited mining within 0 to 600 <br />feet overburden zone depicted on Map 2 -5. Additional mining constraints, developed <br />as pillar stability design calculations, apply to the 600 to 800 feet overburden buffer <br />zones also depicted on Map 2 -5. These additional constraints were based upon <br />recommendations contained in the June, 1983 subsidence study (Subsidence <br />Appendix, Volume 3) conducted by Geo -Hydro Consulting, Inc. <br />0 to 600 feet of overburden <br />Only access entries were developed under Stevens Gulch and <br />East Roatcap Creek drainages. , <br />Permanent protective pillars were left standing to prevent all <br />surface and subjacent disturbance to the overburden. <br />Protective pillars in these buffer zones are designed to provide <br />• safety factors in excess of 2.0 using the Wilson pillar design <br />method. (See Pillar Stability Calculations in Volume 2) <br />PR-4 - 1 - <br />r F�RovE/� <br />V1 3//) <br />06/10 <br />