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iii iiiiiiiiiiiiiiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmenl of NaWral Resources <br />1713 Sherman 51., Room 215 `y <br /> <br />Denver, Colorado 80203 I <br />~~ <br /> <br />Phone: (303) A66-3567 II <br />FAX: (3031 832-8106 <br /> DEPARTMENT OF <br />October 23, 1995 NATURAL <br /> RESOURCES <br />Ms. Alana Scott <br /> <br />Cyprus Empire Corp. Roy Romer <br />covernar <br />P.O. Box 68 lames 5. Lxhhead <br />Craig, CO 81625 Eaecu~ive Direcmr <br /> Michael B. long <br /> Division Di~euor <br />RE: Eagle 5 & 9 Mine (C-81-044) <br />Subsidence Monitoring Report (January-June 1995) <br />Dear Ms. Scott, <br />The Division of Minerals and Geology received Cyprus Empire's semi-annual subsidence <br />monitoring report for the period of January through June 1995. The data presented is clear <br />and well formatted. The color map is also helpful and very easily read. <br />Monitoring point J18, located inside the southern gate road of projected Panel 3rd East is <br />reported to have subsided 11.9 feet as of June, 1995. Monitoring Point J19, 125 feet <br />removed was determined to have subsided only 0.5 foot. 11.9 feet is the largest subsidence <br />monitored to date 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 adjacent panels <br />had been extracted in the E seam, as well as the overlying F seam, the Division is not <br />surprised that it had subsided. The Division is surprised at the large magnitude of the <br />subsidence reported. Could this monument have been mis-surveyed or disturbed? <br />Cyprus Empire should examine the monument in order to verify the subsidence <br />measurement. Further, if the subsidence is verified, Cyprus Empire should propose an <br />hypothesis for the observed subsidence. Please respond to this item by November 17, 1995. <br />If you have any questions, please do not hesitate to call. <br />Sincerely, <br />Erica S. Crosby <br />Environmental Protection Specialist <br />c: \wp51 \eagle \951023 <br />