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-iii iiiiiiiiiiiiiiii <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depan menl of Natural Resources <br />I l l3 Sherman SL, Room 215 <br />Denver, Colorado 80203 . <br />Phone 1303) 866-3567 <br />FA%~ 1303) A32-8106 <br />CL..fvGw~ I`i~s- <br />DATE: Febr~ 4, 1995 <br />TO: Erica Crosby <br />FROM: Jim Pendleton <br />°~'~~- <br />II~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5. Lochhead <br />6ecutive Direcor <br />Michael B. Long <br />Division Director <br />RE: "Subsidence Mo oring Report <br />Cyprus Em Corporation, Eagle Mine No. 5 <br />January - June 1995" (Permit No. C-81-044) <br />I have reviewed the above referenced annual subsidence monitoring data <br />summary report, submitted by Cyprus Empire Corp. for their Eagle mine. <br />The data presentation is clear and well formatted. The color map is also <br />helpful and very easily read. <br />Monitoring point J18, located inside the southern gate road of projected <br />Panel 3rd East is reported to have subsided 11.9 feet as of June, 1995. <br />Monitoring Point J19, 125 feet removed was determined to have subsided <br />only 0.5 foot. 11.9 feet is the largest subsidence monitored to date <br />above the Eagle mine. At that point in time, however, Monitoring Point <br />J18 had not yet been vertically undermined in the E seam. Because three <br />adjacent panels had been extracted in the E seam, as well as the overlying <br />F seam, I'm not surprised that it had subsided. I am surprised at the <br />large magnitude of the subsidence reported. Could this monument have been <br />mis-surveyed or disturbed? I recommend that you direct the operator <br />examine the monument in order to verify the subsidence measurement. <br />Further, if the subsidence is verified, Cyprus Empire should propose an <br />hypothesis for the observed subsidence. <br />In all other aspects the report is acceptable. In the future Cyprus <br />Empire should attempt to submit the results of their monitoring survey in <br />a more timely fashion. <br />cc: Larry Routten <br />Doc: M:\COAL\JAP\EAGSUB95.RPT <br />JP/jP <br />