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III Iilllllllllll III <br />999 <br />n <br />LJ <br />Doc Date:12/11l2001 <br />STATE OF COLORADO <br />OF' ~~lp <br />~. <br />,r ~~.a <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />303 866-3567 <br />FA K. 303 832-8106 <br />Roy Romer, <br />Govemar <br />Fretl R. Banta. <br />Division Director <br /> <br />• <br />DATE: March 2, 1990 <br />T0: Matt Hayes <br />FROM: Jim Pendleton ~~ ~`~ <br />RE: Bear Mine Dece b 1989 Subsidence & Slope Stability <br />Mon ng Report (Permit No. C-81-033) <br />I have reviwed the December 11, 1989 Bear #3 Mine's Subsidence & Slope <br />Stability Report, which you forwarded to my attention. This report was <br />prepared by E. Leroy Black of Ute Engineering & Surveying Company, consultant <br />to Bear Coal Company. The report presents the results of survey monitoring of <br />the subsidence monuments placed above the Bear #3 underground workings and the <br />stability monuments placed within the mine's surface portal area. These <br />surveys were performed during November of~1989. <br />The report summarizes the survey results of the past 4 years monitoring at the <br />Bear #3 Mine. The subsidence monitoring has detected relatively small <br />magnitude vertical movements to date. Similarly, the stability monitoring has <br />not detected appreciable movement at any of the surface monument stations. <br />Mr. Black overlooked including monuments U10 and U11 in summary tables 3 and <br />4. These are two of the most critical monuments and should be included in <br />future summary' tables. The monument data is included under the separate data <br />listing by monument in table 1, so the information is present within the <br />report. <br />I reclanmend acceptance of the report as submitted. Completion of this <br />monitoring is quite challenging in the, terrane existing above the Bear #3 <br />Mine. Bear Coal and Ute Engineering should be commended for a job well done. <br />cc: Sue Mowry <br />Doc. No: 4738E <br />