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TABLE OF CONTENTS III. MINE DESCRIPTION III.A Underground Development ............................................... III.A.1 Mine Openings .................................................... III.A.1.a Portal - D Seam ..................................... III.A.1.b Ventilation Entries - D Seam ................. III.A.1.c Portal - B Seam ..................................... III.A.1.d Ventilation Entries - B Seam ................. III.A.2 Mining Systems ...................................................... II I.A.2.a Room and Pillar Mining ......................... III.A.2.b Longwall Mining .................................... IIi.A.2.c Mining Method Decision,,,,,,,,,,,,,,,,,,,,,,,, III.A.3 Mining Sequence ................................................... III.A.4 Mining Equipment .................................................. III.A.S Roof Control ............................................................ III.A.6 Mining Plan ............................................................ III.A.7 Subsidence ............................................................. III.A.7.a Subsidence Area Survey ........................ III.A.7.b Subsidence Control ................................ • III.A.7.c Subsidence Prediction,,,,,,,,,,,,,,,,,,,,,,,,,,,, III.A.7.d Horizontal Strain Prediction .................... III.A.7.e Pillar Failure Subsidence Potential.,-...... III.A.7.f Conclusions ............................................. III.A.7.g Subsidence Prevention .......................... III.A.7.h Damage Mitigation ................................. III.A.7.i General Subsidence Control ................... III.A.7.j Red Wash and Scullion Gulch ................ III.A.7.k Subsidence Effects on the Powerline..... III.A.7.1 Subsidence Monitoring Program ............. III.A.8 Mine Ventilation ....................................................... III.A.9 Underground Transportation ................................... III.B Surface Support Facilities ...................................................... III.B.1 Coal Handling and Storage ..................................... III.B.2 Coal Preparation Plant ............................................ III.B.3 Refuse Disposal .................................................... 111.6.4 Temporary Coal Laydown Area .............................. III.C Auxiliary Facilities ................................................................... III.D Utilities .. ................................................................................. • Midterm Review (8!2002) .............III-1 .............III-2 .............III-2 .............III-2 .............III-2 .............III-2 .............III-2 ............III-4 III .................... tll-6 ..................... III-6 ..................... III-7 ..................... III-8 ..................... III-8 ........,.III-28 .....,, III-28 ....,.....III-28 ..........III-29 ..........III-29 III-30 .....,, III-30 III-33