2015-08-12_PERMIT FILE - C1981018A

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TABLE OF CONTENTS III. MINE DESCRIPTION III.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 II.A.1.c Portal -13 Seam ................ ............................... ..........................111 -2 II.A.1.d Ventilation Entries - B Seam ...................... ............................... 111 -2 III.A.2 Mining Systems ........................................................... ............................... III -2 III.A.2.a Room and Pillar Mining .............................. ............................... III -4 III.A.2.b Longwall Mining ................ ............................... ..........................III -4 III.A.2.c Mining Method Decision ............................. ............................... III -6 Ill.A.3 Mining Sequence ......................................................... ............................... III -6 III.A.4 Mining Equipment .............................. ............................... ..........................III -7 III.A.5 Roof Control ................................................................. ............................... III -7 III.A.6 Mining Plan ........................................ ............................... ..........................III -8 III.A.7 Subsidence ........................................ ............................... ..........................III -8 III.A.7.a Subsidence Area Survey ........................... ............................... III -8 III.A.7.b Subsidence Control .................................... ............................... III -9 Ill.A.7.c Subsidence Prediction .............................. ............................... III -11 III.A.7.d Horizontal Strain Prediction ...................... ............................... III -14 III.A.7.e Pillar Failure Subsidence Potential .......... ............................... III -14 III.A.7.f Conclusions ...................... ............................... .........................III -14 II.A.7.g Subsidence Prevention ... ............................... .........................111 -17 III.A.7.h Damage Mitigation ................................... ............................... III -18 III.A.7.i General Subsidence Control . ................................................... III -19 III.A.7.j Red Wash and Scullion Gulch .................. ............................... III -19 III.A.7.k Subsidence Effects on the Powerline ...... ............................... III -21 III.A.7.1 Subsidence Monitoring Program ..................... .........................III -22 III.A.8 Mine Ventilation ......................................................... ............................... III -26 ll.A.9 Underground Transportation ..................................... ............................... III -28 111.6 Surface Support Facilities ................................ ............................... ......................... III -28 111.6.1 Coal Handling and Storage ....................................... ............................... III -28 II.B.2 Coal Preparation Plant .............................................. ............................... III -29 111.6.3 Refuse Disposal ............................... ............................... .........................III -29 111.6.4 Temporary Coal Laydown Area ................................ ............................... III -30 III.0 Auxiliary Facilities ..................................................................... ............................... III -30 III.D Utilities ...................................................................................... ............................... III -33 Permit Revision #8 (2/2013)