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• <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment of Nawral Resources <br />1 313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone 13031 866-3567 <br />FAX: (303) 8328106 <br />November 8. 2000 <br />Allen S. Weaver <br />Mine Engineer <br />Energy Fuels Mining Company <br />P.O. Box 449 <br />Florence, CO 81226 <br />RE: 1999 Annual Hydrology Report, Raton Creek Mine, Permit No. C-82-055 <br />Mr. Weaver: <br />D I VISION O F <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•gAFETY <br />Bill Or.ens <br />Governor <br />Creg E. Walther <br />&ecwive D~recmr <br />Michael 8. Long <br />Dl~uion D~recrur <br />The Division of Minerals and Geology has completed review of the 1999 Annual Hydrology <br />Report (AHR) for the Raton Creek Mine. Review of the AHR file indicates that no response was <br />received from Energy Fuels concerning issues raised as a result of the 1998 Annual Hydrology <br />Report review. Those questions are re-stated below in Italics; please respond to these <br />questions immediately upon receipt. <br />1998 Annual Hydrology Report Review <br />Monitoring Frequency <br />The hydrologic monitoring plan presented on page 522 of the approved permit requi2s <br />monthly visits with measurement of water level, tempe2ture, pH, and E.C. for the Refuse <br />well and the luppa well. All visits were conducted in accordance with the approved plan <br />with fhe exception o(the March 1998 field sampling visit, where it appears from <br />inspection of the cumulative data for the wells that water level was measured but field <br />parameters wen: not collected. <br />2. Who visits the sediment pond and the permanent diversion on a weekly basis to check <br />for, and measure, discharge and field parameters, if discharge is observed? <br />3. Monitoring frequency, specific to laboratory sampling requirements, was met on a semi- <br />annual basis for the luppa well and on a quarterly basis for the Refuse well. <br />Water Quantity and Quality <br />4. No significant changes attributable to mining have occurred regarding wafer levels in the <br />two monitoring wells. Water quality shows no degradation affecting any probable use. <br />Total Dissolved Solids downgradient of the refuse pile have increased slightly but are <br />within the predicted levels. For reasons unknown at this time, the Refuse well <br />experienced a brief but substantial decline in water level in April of 1998. However, <br />water levels returned to normal levels within 60 days and no further deviations were <br />recorded during 1998. <br />5. Please submit a minor revision proposing the following modifications as necessary to the <br />hydrologic reporting requirements. <br />• i~i~l~liii~niiir~i <br />STATE OF COLORADO <br />