Laserfiche WebLink
• Introduction <br />This report is for the period from July 2009 through December 2009. 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 />The B-8 panel was mined during the period. Development of the B-9 headgate and <br />tailgate were completed during the period. Mining began in the 1 st West Mains. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modern landslides was not conducted <br />during the period because mining was restricted to a isolated area. <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 springs 34-10, 34-22, 34-23 and 34-25 were impacted or re-impacted mining <br />of the D-8 panel. Potentially impacted or re-impacted means the mine workings or angle <br />of draw of the mine workings passed under the monitoring point during the reporting <br />period. No influence to any hydrologic monitoring points was observed during this <br />period. <br />Results of Subsidence Survey Monitoring <br />The results of the September and November 2009 monitoring are attached. As in the <br />past, the 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. Development of the B-8 panel <br />occurred near Hubbard Creek and Dove Gulch. <br />• <br />-2-