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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 />December 5, 2013 <br />James A. Kiger <br />Oxbow Mining, LLC. <br />P.O. Box 535 <br />3737 Highway 133 <br />Somerset, CO 81434 <br />Re: Elk Creek Mine (Permit No. C- 1981 -022) <br />2011 Annual Hydrology Report <br />Adequacy Review <br />Dear Mr. Kiger: <br />COLORADO <br />D I V I S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta Pineda <br />Director <br />The Colorado Division of Reclamation, Mining and Safety (Division) has finished its adequacy <br />review of the 2011 Annual Hydrology Report (AHR) for the Elk Creek Mine. In general the report <br />is well organized; however, the Division has some comments: <br />1. Field parameters were collected and laboratory analyses were conducted as required at all <br />groundwater and surface water sites with the following exceptions: <br />a. Table 2.04.7 -T1 of the permit application package is the list of required monitoring <br />parameters for surface and groundwater monitoring. The list requires reporting of <br />both alkalinity and bicarbonate alkalinity. None of the 2011 monitoring data includes <br />numeric values for alkalinity (CaCO3); graphs of alkalinity are presented for some of <br />the monitoring sites. OMLLC needs to revise the 2011 AHR to include this required <br />data. <br />b. The 3rd quarter data for NF -3 was missing iron (Fe), both total recoverable and <br />dissolved. OMLLC needs to revise the 2011 AHR to include this required data. <br />c. Rule 4.05.13(4)(b) states that data collection shall be based upon a water year <br />(October 1 — September 30). Flow data at H -1 and NF -2 was provided graphically for <br />all of 2011, but actual flow data figures (from USGS station reports) were only <br />provided for October through May for H -1 and October through January for NF -1. <br />OMLLC needs to revise the 2011 AHR to provide numeric data for flow <br />measurements for the full 2011 water year at NF -1 and HN -1. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines <br />