Laserfiche WebLink
STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />January 8, 2010 <br />COLORADO <br />DIVISION OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Mr. William A. Bear Governor <br />Bowie Resources LLC Harris D. Sherman <br />P.O. Box 483 Executive Director <br />Paonia, Colorado 81428 Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />RE: Bowie No. 2 Mine, Permit No. C-96-083, Bowie Resources LLC <br />Technical Revision No. 65, Amend the B-Seam Mine Plan and Drill One Geotech Hole, Adequacy <br />Review <br />Dear Mr. Bear: <br />The Colorado Division of Reclamation, Mining and Safety (Division) has finished its adequacy review for <br />Technical Revision No. 65 (TR-65), submitted by Bowie Resources LLC for the Bowie No. 2 Mine. The <br />following are the Division's questions and comments: <br />Ground Water <br />Please provide a plan for incorporating additional ground water monitoring wells at locations down <br />gradient from the new disturbance/revised mine plan areas proposed with TR-65. Monitoring wells <br />should be located within the coal seam(s) to be mined and the saturated zone(s) above the coal <br />seam(s) down gradient of both the main entries beneath Terror Creek and North Mains mine plan <br />areas. The Hydrologic Monitoring Plan, permit text and tables should be updated accordingly. <br />2. Please update the permit document to expand the discussion regarding the hydraulic isolation of the <br />Rollins sandstone to include the area beneath Terror Creek at the west end of the permit boundary. <br />BRL should make the case that similar conditions exist and no additional monitoring is necessary in <br />the Rollins sandstone at the west end of the permit boundary where new disturbance is proposed with <br />TR-65 (main entries beneath Terror Creek and North Mains Rooms). To the extent practicable <br />please update appropriate maps and cross-sections with available geotechnical data or drill log <br />information to demonstrate the hydraulic isolation of the Rollins sandstone. <br />The proposed geotechnical hole which would be located by monitoring well TC-03-01 is described in <br />the cover letter to the application. Based on discussion with J.E. Stover & Associates the <br />geotechnical hole is in the same location as the ventilation shaft being proposed for TR-66. It is <br />unclear whether BRL will abandon the geotechnical hole prior to vent shaft installation. Please <br />describe the abandonment plans for the geotechnical hole and how this will be coordinated with <br />ventilation shaft construction. <br />4. A dip-slip fault is known to exist within the permit boundary in the immediate area of the proposed <br />main entries beneath Terror Creek. The strike and the displacement of the fault are shown on Map <br />08 of the permit application. Based on review of available information it appears that the fault will <br />be encountered at the First Quarter 2010 main entry located to the east of Terror Creek. Significant <br />quantities of water from mine inflow may be encountered at the fault location during mining of the <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines