Laserfiche WebLink
Introduction <br />This report is for the period from July 1, 2014 through December 31, 2014. Mine <br />Construction of the Bowie No. 2 Mine began during May of 1997, with coal production <br />beginning during August 1997. <br />The mining permit application for the Bowie No. 2 Mine requires the operator to submit <br />the results of the subsidence monitoring programs and the results of the visual <br />inspections of known modern and historic landslides within the permit and adjacent area <br />for stability in June and December of each year and report these results to the Division <br />within 30 days of the end of the reporting period. <br />The Operator is also required to inspect these landslides, both modern and historic, <br />monthly for six months immediately after retreat mining occurs. This same inspection <br />routine is applied to any spring or pond in the immediate proximity of retreat mining. <br />During the reporting period, mining was completed in panel B -15. Panel B -16's <br />headgate and trailgate were completed during the period. Mining commenced in panel <br />B -16. Panel B -16 is 50% complete with approximately 1,540 feet of the panel remaining <br />to mine. Development in the north mains continued during the period. The north mains <br />have been developed approximately 2,500 feet to date. The headgate and tailgate for <br />panel B -17 were developed during the period with the headgate and tailgate advancing <br />about 5,100 and 2,500 feet respectively. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modern landslides was conducted during <br />November 20th through 22nd, 2014 by Brad Lindsay, Rock Logic Consulting LLC. Mr. <br />Lindsay's report is attached. No new cracks were observed over Panel B -15 or the <br />beginning of Pane B -16. <br />Increased Inspection activity associated with retreat mining. <br />Accessible subsidence cracks are repaired during coal exploration events and are <br />monitored by both coal exploration supervisors and hydrologic monitoring technicians. <br />Pond and Spring 23 was potentially impacted by Panel B -15. Panel 16 did not impact <br />any springs or ponds during the period. Potentially impacted or re- impacted means the <br />mine workings or angle of draw of the mine workings passed under the monitoring point <br />during the reporting period. No influence to any hydrologic monitoring points was <br />observed during this period. <br />Results of Subsidence Survey Monitoring <br />The Pitkin Mesa Pipeline surveys were conducted in July, September and October. <br />Monitoring points PL -11 and PL -12 which are located over panel 15 showed some <br />addition downward movement. The Terror Creek and Terror Creek transmission line <br />tower surveys were performed during September and October 2014. Monitoring results <br />are attached. As in the past, the survey was performed by Cragg Surveying using GPS <br />methods. <br />-2- <br />