Laserfiche WebLink
Introduction <br />This report is for the period from January 2010 through June 2010. Mine Construction <br />of the Bowie No. 2 Mine began during May of 1997, with coal production beginning <br />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 <br />area for stability in June and December of each year and report these results to the <br />Division within 30 days of the ends of the reporting periods. <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 />Mining continues in the 1st West Mains. B-9 Longwall was completed during the <br />period. The B-Seam rooms located southeast of the B-West Mains were completed <br />during the period. Mining of B-Seam rooms located west of the North Mains is ongoing <br />during the period. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modern landslides was conducted during <br />July, 2010 by Brad Lindsay, Rock Logic Consulting LLC. Mr. Lindsay's report is <br />attached. No new subsidence cracks were noted. <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 />The accessible visual results of the subsidence effects associated with the Bowie No. 2 <br />Mine are overlain on Map 27-C Subsidence Features. Map 27-C is enclosed. During <br />this period spring S-12 was impacted or re-impacted during mining of the B-Seam <br />rooms located southeast of the B-West Mains. Potentially impacted or re-impacted <br />means the mine workings or angle of draw of the mine workings passed under the <br />monitoring point during the reporting period. No influence to any hydrologic monitoring <br />points was observed during this period. <br />Results of Subsidence Survey Monitoring <br />The results of the May and June 2010 monitoring are attached. As in the past, the <br />survey was performed by Cragg Surveying using GPS methods. <br />Analysis of Subsidence Data <br />The following table presents an analysis of the subsidence survey data. Following is a <br />summary of the survey data collected during the period. <br />-2-