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TABLE OF CONTENTS III . MINE DESCRIPTION ..................................................................................................... ............ III-1 111.A Underground Development ............................................................................... ............ III-1 III.A.1 Mine Openings .................................................................................... ............ III-2 III.A.1.a Portal - D Seam .................................................................... ............ III-2 III.A.1.b Ventilation Entries - D Seam ............................................... ............ III-2 III.A.1.c Portal - B Seam .................................................................... ............ III-2 III.A.1.d Ventilation Entries - B Seam ................................................ ............ III-2 III.A.2 Mining Systems ...................................................................................... ............ III-2 III.A.2.a Room and Pillar Mining ....................................................... ............ III III.A.2.b Longwall Mining ................................................................... ............ III-4 III.A.2.c Mining Method Decision ...................................................... ............ III-6 III.A.3 Mining Sequence ................................................................................... ............III-6 III.A.4 Mining Equipment .................................................................................. ............ III-7 III.A.S Roof Control ........................................................................................... ............ III-8 III.A.6 Mining Plan ............................................................................................. ............ III-8 III.A.7 Subsidence .........................................................................................:... ............111-9 III.A.7.a Subsidence Area Survey ..................................................... ............ III-9 III.A.7.b Subsidence Control ............................................................. .......... Ill-10 III.A.7.c Subsidence Prediction ......................................................... ..........III-11 III.A.7.d Horizontal Strain Prediction ................................................. .......... III-13 III.A.7.e Pillar Failure Subsidence Potential ..................................... .......... III-15 111.A.7.f Conclusions ........................................................................... ..........III-15 III.A.7.g Subsidence Prevention ........................................................ .......... III-15 III.A.7.h Damage Mitigation ............................................................... .......... III-19 III.A.7.i General Subsidence Control ................................................ .......... III-19 III.A.7.j Red Wash and Scullion Gulch .............................................. .......... III-20 III.A.7.k Subsidence Effects on the Powerline .................................. .......... III-21 III.A.7.1 Subsidence Monitoring Program .......................................... .......... III-23 III.A.B Mine Ventilation ...................................................................................... ..........111-27 III.A.9 Underground Transportation ................................................................. .......... III-29 III.B Surface Support Facilities ...................................................................................... ..........111-29 III.B.1 Coal Handling and Storage ................................................................... .......... III-29 111.6.2 Coal Preparation Plant ........................................................................... .......... III-29 III.B.3 Refuse Disposal ..................................................................................... .......... III-30 III.B.4 Temporary Coal Laydown Area ............................................................ .......... III-30 III.C. Auxiliary Facilities ................................................................................................... .......... III-32 III.D Utilities .................................................................................................................... ..........III-34 III.D.1 Electric Power Supply ............................................................................ .......... III-34 IIf.D.2 Water Supply .......................................................................................... .......... III-35 III.D.3 Sewage Treatment ................................................................................ ..........111-35 III.D.4 Telecommunication ................................................................................ ..........III-35 (Permit Renewal #3, Rev. 8/99)