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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />February 23, 2007 <br />George Patterson <br />Energy Fuels Mining Company <br />P.O. Bax 449 <br />Florence, CO 81226 <br />RE: 2006 Subsidence Survey, Southfield Mine, Permit No. C-81-014 <br />Mr. Patterson: <br />COLORADO <br />DIVISION OF <br />RECLAMATION <br />MINING <br />- Si- <br />SAF ETY <br />Bill Owens <br />Govemar <br />Russell George <br />Executive Director <br />Ronald W. Cottony <br />Division DIfF!CIO! <br />Natural Resource Trustee <br />The Division of Minerals and Geology has completed review of the 2006 Subsidence <br />Survey for the Southfield Mine. The approved subsidence monitoring plan requires <br />monitoring in the form of land surveying of existing subsidence monitoring points at or <br />near structures and renewable resource lands. The surveys are required in 2006 and <br />2012 during the revegetation liability period. <br />Survey data was collected at the Thompson Ranch buildings, City of Florence water <br />line, and a single point along Newlin Creek. Data reported at each point includes <br />northing, easting, and elevation. These data are compared to the original (baseline) <br />survey point as well as survey immediately previous and the values are reported as the <br />difference (delta) from these two prior measurements. <br />Data collected shows that any additional subsidence that occurred since the most <br />recent measurement was negligible. Cumulative subsidence as compared to baseline <br />measurements was within the subsidence predictions in the approved permit. <br />Subsidence, although measurable, has had no impact to any structure or feature. <br />We have no further questions. Thank you for your diligence in completing monitoring <br />as approved in your permit application. If you have any questions, please call me. <br />Sincere y, <br />/ ~'`~z'---- <br />Ke t Gorham <br />Environmental Protection Specialist II <br />Office of <br />Mined Land Reclamation <br />Office of <br />Active and Inactive Mines <br />