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2016 Production and Geologic Conditions <br />The Bowie No. 1 Mine suspended operations during December, 1997 and remained idle <br />throughout the calendar year. The mine has been reclaimed. <br />Operation Unit Descriptions <br />Bowie No. 1 Mine has no operating units to report on during the calendar year. <br />Subsidence Impacts - 2016 <br />With the approval of technical revision number 25, no subsidence monitoring stations <br />were surveyed during the year. <br />Wide -Spaced Monitoring Grid Station Summary <br />Through technical revision number 45, the DRMS approved a reduction in subsidence <br />monitoring. The wide spaced subsidence monuments, Sites 6, 14, 15, 16, DH 55, DH <br />65, DH 66, DH 68, 81, 82, 83 and 95 were not monitored during the year. <br />Pitkin Mesa Pipeline <br />Seven subsidence monitoring stations were established at locations along the Pitkin <br />Mesa Pipeline which overlies Panel C. Panel C development commenced in October <br />with twenty-four crosscuts completed by January 1, 1993. Panel C was mined utilizing <br />a partial extraction design intended to preclude the development of subsidence in order <br />to protect the pipeline. The subsidence monitoring stations along the pipeline are <br />depicted on Map No. 2-5. Though technical revision number 57, the DRMS approved <br />the cessation of subsidence monitoring of the seven (7) Pitkin Mesa Pipeline monitoring <br />locations. These monitoring stations (PL -01 through PL -07) were last surveyed during <br />2013. <br />Visual Monitoring 2016 <br />Visual subsidence monitoring is accomplished by periodic "walkovers" of recently mined <br />areas within the present permit area. During the 2016 monitoring season, visual <br />monitoring consisted of visual inspections done while water monitoring. <br />Visual monitoring is concentrated over areas of retreat mining with particular emphasis <br />on areas mined under low overburden. Since the mine has now been idled in excess of <br />10 years, there are no areas of particular emphasis on which to concentrate visual <br />inspections. <br />Projected Subsidence Impacts - 2017 <br />Subsidence impacts during 2017 are projected to be minimal based upon subsidence <br />patterns established to date. No mining is currently projected for 2017. <br />Projected Subsidence Monitoring — 2017 <br />No subsidence monitoring will be performed in 2017. <br />