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• • Ill 1111111111111111 <br />STATE OF COLOIv~,~v <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />MEMORANDUM <br />4 August 1987 <br />T0: Cathy Begej ~` ~ r_~~ <br />FROM: Jim Pendleton ~,~'~ <br />RE: Colorado Wes an Ines. Semi-Annual Subsidence Monitoring Report <br />Permit No: C-82-038) <br />I have reviewed the semi-annual subsidence monitoring survey data report for <br />the Orchard Valley Mine, which you forwarded to me. The survey data appears <br />clearly and accurately tabulated within the report. Jim Miller, the Mine <br />Engineer and author of the report's cover letter, states in the cover letter <br />that no subsidence has occurred during this period of observation, MY <br />examination of the data report determined that subsidence has continued to <br />develop above the panels off the 5th North submains off the 8th East mains. <br />Vertical settlement of up to 0.35 feet and associated vertical rise of up to <br />0.59 feet were documented. This sort of cantilever adjustment is not <br />unusual. A visual inspection conducted above the workings detected no <br />evidence of subsidence disruption of the ground surface. <br />Jim Miller's cover letter also mentions that the 1st West submains developed <br />from the new West Portals were relocated slightly due to bad roof fall <br />conditions encountered at their original planned location, This is not a high <br />priority, but the operator should amend the mine plan maps appropriately prior <br />to submission of their next Annual Hydrology and Subsidence Report. <br />cc: Bob Liddle <br />-C~,l~ <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />