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Richard D. Lamm <br />Governor <br />M E M O R A N D U M <br />III IIIIIIIIIIIII III <br />999 <br />DIVISION <br />•.\ February 1984 <br />T0: Sandra Emrich ~ ) - <br />FROM: Jim Pendleton - <br />RE: Empire Energy.Corpor ion's fall, 1983 Subsidence Monitoring Report <br />Pursuant to your request, I have completed a review of the Fall, 1983 <br />Subsidence Monitoring Report submitted by Empire Energy Corporatlon for their <br />Eagle No. 5 6 No. 9 Mines Complex. This report observes that the maximum <br />observed subsidence "... is slightly greater than the predicted subsidence <br />using the Abel and Lee equations for subsidence." In the cases of monument <br />rows A and B the overage approaches 30 to 40 percent of the originally <br />predicted maximum value. I do not believe that this degree of overage is <br />critical in these particular areas. However, we should review the next report <br />closely, in order to ascertain whether the observed overage continues to <br />increase. It may be necessary to require amendment of the permit document <br />subsidence treatment, if the overage significantly increases above that now <br />documented. <br />In my memo to you dated January 3, 1984, I reviewed the subsidence monitoring <br />report format proposed by Empire Energy Corporation, in response to <br />Stipulation No. 23 of their approved permit for the Eagle Mine Complex. In <br />that same memo, I recommended the inclusion of horizontal location survey data <br />within their report format, in addition to the vertical data proposed by the <br />operator. Because my review postdates the operator's submis:sion of their Fall <br />'83 subsidence monitoring report submittal, I do not consider 1t appropriate <br />to require amendment of this report. In the future, however, we should <br />require the inclusion of both the horizontal and vertical monument location <br />survey information within the report. <br />With this understanding, I <br />Monitoring Report submitted <br />No. 9 Mine Complex. <br />cc: Ed Bischoff <br />Doc. No: 9456E <br />recommend that we accept the Fall 1983 Subsidence <br />by Empire Energy Corporatlon for its Eagle No. 5 8 <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches. Executive Director <br />MINED LAND RECLAMATION <br />DA1+e~HELTON, Director <br />