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May 20, 2014 <br />Sent Via Email and and UPS Tracking # 1Z <br />Mr. Peter Hays <br />Division of Reclamation Mining and Safety <br />1313 Sherman St., Rm. 215 <br />Denver, CO 80203 <br />847 03 7714 7305 <br />J I'L 4 <br />COLORADO OPERATIONS <br />Henderson Mine and Mill <br />P.O. Box 68 <br />Empire, CO 80438 <br />Phone (303) 569 -3221 <br />Fax (303) 569 -2830 <br />NY'9 <br />DID, • U14 <br />AfIN NC �EctA'V' p <br />SgFFP, N <br />RE: Climax Molybdenum Company, Henderson Mill, Permit No. M- 1977 -342, Proposed <br />Technical Revision No. 23, Ute Park Extraction Wellfield - Phase I <br />Dear Mr. Hays: <br />Climax Molybdenum Company (CMC) is su <br />Henderson Reclamation Permit for the Phz <br />Wellfield, downgradient of the Henderson <br />extraction wellfield permitted under TR -10 <br />built -out over the next several years. Th <br />hydrogeologic investigations and modelin <br />bypassing the existing extraction system <br />compliance wells MLGW -7 and MLGW -15. <br />extraction and monitoring well network is inc <br />hitting this request for a Technical Revision (TR -23) to the <br />e I construction of an upgrade to the Ute Park Extraction <br />Aill Tailing Storage Facility (TSF) 1 Dam. The existing <br />II eventually be replaced by this new wellfield as it is fully <br />need for a new wellfield was identified during ongoing <br />which indicate that seepage impacted groundwater is <br />ind could migrate further downgradient toward point of <br />site map depicting the area below 1 Dam and the existing <br />ded in Attachment A, Figure 1. <br />Since 1995, Henderson has worked to imp ement groundwater protection programs, especially in the <br />areas downgradient of 1 Dam. The protection programs have allowed Henderson to evaluate the <br />effectiveness of the 1 Dam seep water c Ilection system and have resulted in the installation of <br />monitoring and extraction wells in addition to characterization of the aquifer downgradient of the Dam. <br />The aquifer downgradient of 1 Dam is comprised of glacial drift and outwash deposited during the <br />Quaternary period (Attachment A, Figure !2). This unconsolidated material allows for storage and <br />movement of groundwater. In 2012 AJ , Clear Creek Associates and CMC installed additional <br />observation /monitoring wells and completed a capture zone assessment utilizing these new wells along <br />with previously installed monitoring wells aid piezometers. Groundwater flux through the aquifer is <br />estimated to range from 300 to 400 gallons per minute. <br />The purpose of the Ute Park Extraction Well <br />groundwater below 1 Dam and pump it into f <br />the TSF and recirculated back to the Mill r <br />anticipated to be completed in three phases, <br />effectiveness to be evaluated as the project I <br />early summer of 2014 and will involve the <br />infrastructure including piping, electrical and <br />anticipated to allow for further characterizal <br />information on composition, thickness, hydra <br />information will be utilized to optimize the de <br />eld is to effectively intercept and capture seepage affected <br />e seepwater collection canals, where it is then pumped into <br />-ocess water system. The construction of the wellfield is <br />as shown in Attachment A, Figure 3. This will allow for its <br />ogresses. Construction of Phase I is scheduled to begin in <br />installation of one extraction well (MLEX -1) and support <br />instrumentation. The installation of the well in Phase I is <br />on of the aquifer by providing drilling logs and additional <br />lic conductivity and pumping capacity of the deposits. The <br />ign of the Phase II and Phase III extraction wells including <br />r b �GL�1Ci X1.5 <br />