Laserfiche WebLink
J. E. STOVER & ASSOCIATES <br />2768 COMPASS DRIVE, SUITE 101 <br />GRAND JUNCTION, COLORADO 81508 <br />PHONE: (970) 245-4101, FAX 242-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />November 11, 2004 <br />J. J. Dudash <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Bowie Resources Limited <br />Bowie No 1 Mine <br />RECEIVED <br />NOV 1 5 2004 <br />Division of Minerals and GeoloBY <br />Reduce Suspend Subsidence Monitoring <br />Permit No. C-81-038 <br />Dear Mr. Dudash: <br />~-~ 5 <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />On behalf of Bowie Resources, LLC, enclosed is an application to reduce the required <br />subsidence monitoring at the Bowie No. 1 Mine. Permit application page 147 states: <br />"Wide-spaced monument surveying shall continue on an annual basis until sites <br />are shown to be stabilized and approval to discontinue monitoring selected sites <br />is obtained from the Division. COVCC will inform the Division of proposed sites <br />to be surveyed in upcoming years in the Annual Subsidence Reports submitted <br />to the Division. COVCC will request Division approval of selected sites prior to <br />conducting the annual surveys:' <br />This request is to suspend subsidence monitoring on thirteen (13) wide spaced <br />monuments, stations 14, 15, 16, 6, 81, 82, 83, 95, 99, DH-55, DH-65, DH-66 and DH- <br />68. The attached table shows the thirteen monuments have been stable since <br />November, 2001, a period of three years. This date was chosen because it represents <br />the time Cragg Surveying started using GPS survey methods. Historic monitoring data <br />is also provided for each of the thirteen stations. <br />Very little, if any, information can be obtained from wide spaced subsidence monitoring <br />other than vertical elevation change over time. The monuments are too far apart to <br />determine angle of draw or break angle or to plot a subsidence profile. <br />A map which shows the location of the subsidence monuments is included for your <br />reference. Please call if you have any questions. <br />Sincerely, <br />~~ <br />J. E. Stover, P. E. <br />Consulting Engineer <br />