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S COLORADO WESTMORELAND INC. I~IIIIIII~IIIIIIIII <br />P.O. Box 1299 Paonia, Colorado 81428 O 303-527-4135 <br />July 29, 1987 <br />Mr. Thomas A. Schreiner, Reclamation Specialist ~~ Q°n ~° ~ ~ ~~ <br />Colorado Mined Land Reclamation bivision 1~ ko <br />423 Centennial Building 1987 <br />1313 Sherman Street JUL `~ 1 <br />Denver, Colorado 80203 <br />MINtD LAND <br />AE: 1987 SEMI-ANNUAL SUBSIDENCE REPORT DECLAMATION DIVISION <br />Dear Tom; <br />Enclosed are the results of Colorado Westmoreland Inc .'s CWI) 1987 semi-annual <br />subsidence survey performed during June, 1987. <br />Both the wide spaced grids and high resolution grids indicated no movement had <br />occurred from the last 1986 monitor survey through the June, 1987 survey. This <br />displays evidence of subsidence movement overlying 11 North and 12 North panels <br />has virtually ceased. Monitoring of the recently installed wide spaced grid <br />points 90, 92, and 93 also indicates no movement has occurred from advance min- <br />ing within the Orchard Valley West Mine. <br />Advancement of the First West Sub-Mains and South III Sub-Mains has been com- <br />pleted. The South III Sub-Mains were extended to the proposed location of in- <br />tersection with the First West Mains upon which poor roof conditions were en- <br />countered. Two roof falls occurred within this area and consequently changes in <br />the mine plan were required. As a result, the Second West Sub-Mains have been <br />developed at approximately Crosscut iP15 of the South Sub-Mains. <br />Advancement mining only is projected for the remaining part of 1987. The Second <br />West Sub-Mains and relocated First West Mains will be partially developed during <br />1987. CWI anticipates no subsidence induced movements related to mining activi- <br />ties during the year of 1987. The analysis of subsidence movement, if any, will <br />be included in CWI's 1987 Annual Hydrology and Subsidence Report. <br />If you desire any further information, please contact Kathy Welt or me. <br />Sincerely, ~ Q~~ <br />"Jim Miller <br />Mine Engineer <br />~RO VE D <br />4l r~..s2, ~ 'v,P <br />Ronald W. Stucki <br />Vice President b General Manager <br />JM:fec <br />cc: Christopher K. Seglem, President, CWI <br />Kathy Welt, Environmental Specialist, CWI <br />Jim Pendleton, CMLRD <br />• <br />suasi~aar ov <br />WESLM OPE~PN^ <br />Ct]Pl COMPPN~ <br />