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- ` of ~~<o III IIIIIIIIIIIIII III <br />'C~ ~9 <br />~~ ~ o DEPARTMENT OF NATURAL RESOURCES <br />* ~.1 ~ c G~. * Damd H. Getches, Executive Director <br />'~'~" MINED LAND RECLAMATION DIVISION <br />* 1876 ; DAVID C. SHELTO N, Director f <br />Richartl D. Lamm i /v,y~ <br />Governor ~„yy~~ <br />DATE: June 3, 1986 <br />T0: Gregg, Jim <br />FROM: Jeff •9~ <br />RE: Subsidence over Longwall Panel <br />Eagle No. 5, File No. C-81-044 <br />On May 29, 1986 I inspected the subsidence features associated with panel no. <br />1 of the Eagle #5 Mine which were described in Empire Energy's January 20, <br />1986 report. <br />Although subsidence of 4-6 feet has been reported, there is no evidence of <br />changes in surface topography (i. e., enclosed basins, steep drops, etc.). The <br />surface cracks shown on the subsidence topography map on the west side of the <br />drainage were inspected. The cracks were difficult to find, as they are not <br />large features. The largest crack was approximately Dne foot wide, one foot <br />deep and 100-200 feet long. The cracks were filled in the bottoms either from <br />side sloughing or from a dropping of the surface similar to a mini-graben. <br />In addition to the cracks which were reported, a series of riew cracks had <br />appeared on the east side of the drainage, north of R-5 (see drawing). There <br />were as many as 10-15 parallel cracks (along the contour) which were slightly <br />larger than the ones previously reported. These cracks were also filled. <br />Based on my inspection, I feel that subsidence over this panel to date does <br />not affect the post-mining topography and does not present a hazard to public <br />health and safety. However, as surface manifestations of subsidence are <br />apparently ongoing, the situation should continue to be monitored by the <br />Division. <br />0827E/cj <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />