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Permit Amendment (AM-06) - Climax Mine <br />CM0000492 <br />potentially acid producing. It should be noted, however, that the long-term use of this TSF strictly as a <br />water treatment facility has served to add significant amounts of lime to the impoundment. Another <br />source of potential contamination is seepage emanating from the toe of 5 Dam. This seepwater is slightly <br />acidic with elevated sulfates and metals. <br />As an EPF, the Mayflower TSF, including 5 Dam, is crucial. Along with the final pH adjustment at the pH <br />Control Station, the TSF acts as the final stage water treatment system for Climax process water, mine <br />water, and seepage waters. Mayflower TSF provides containment of contaminated materials or <br />designated chemicals that may be released up-gradient of the TSF. In addition, the Mayflower TSF <br />contains, mixes, and treats impacted waters from several historic mines and smelter sites as well as non- <br />point run-off waters which contact mine wastes within a large portion of the historic Consolidated Tenmile <br />Mining District. <br />5 Dam Seepwater Collection and Return System: The seepwater collection and return system below 5 <br />Dam (Mayflower TSF) is an important EPF at the Climax Mine. Although it has been discussed <br />previously in some detail as part of the Climax water treatment and discharge system EPF, it is discussed <br />again here as a specific EPF. Seepage from the dam is routed to concrete ponds. Collected seepage is <br />pumped back by vertical turbine pumps to the 3 Dam Pump Station or the water pool on the Mayflower <br />TSF. This pump system is located within the Mayflower Pump Station below the TSF. During upset <br />conditions, seepage can be temporarily contained within the 5 million gallon concrete pond system. <br />EPFs for Designated Chemicals for Concentrate Production: The EPFs for the designated chemicals <br />used for milling and production of concentrate at Climax include enclosed buildings, tanks and bins, <br />sumps, and berms singly or in combination. However, the final end point EPF for designated chemicals is <br />the Mayflower TSF and the associated water treatment and discharge system. As stated previously, the <br />mill site and its ancillary facilities are located within the upper Tenmile Creek watershed. Therefore, a <br />release of a designated chemical or process waters not contained at the release site ultimately would be <br />contained at the TSFs. <br />The new mill facility and layout is currently being designed for the resumption of mineral production. The <br />new mill was identified as an EPF in TR-14. As design of the mill has not been finalized, individual EPFs <br />within the mill building have not been established, and the reagent storage portion of the mill is classified <br />as an EPF. When design becomes final, revised EPFs within the mill will be established and a Technical <br />Revision will be submitted to outline these various EPFs. <br />During the period since 1996, Climax Mine has operated in standby mode. During this time, production <br />chemicals were removed from the site, and significant demolition of facilities occurred. Once planning <br />and engineering is complete and the final determination is made to move to production, appropriate TRs <br />will be submitted to DRMS. At that time, additional information regarding designated chemicals for new <br />production and their associated EPFs will be provided. <br />McNulty Seepage Collection System: Construction of a new seepage collection system is planned below <br />the McNulty OSF to intercept and collect impacted water from this area. <br />North 40 Seepage Collection System: Construction of a new seepage collection system is planned below <br />the North 40 OSF to intercept and collect impacted water from this area. <br />PDWTP: The new PDWTP would provide second stage treatment of the impacted waters to comply with <br />stream standards and discharge permit requirements. The flow capacity of this plant would limit the total <br />discharge capacity of the process water system. As stated previously, when final design of the PDWTP <br />becomes available, appropriate submittals will be made to DRMS. At that time, additional information <br />regarding chemicals for water treatment contained within the PDWTP and their associated EPFs will also <br />be provided. <br />T-5.4 Environmental Protection Facility Effectiveness Evaluation <br />The EPFs described and discussed for the three watersheds at the Climax Mine site have been very <br />effective in preventing releases of potential contaminants to the environment. <br />• <br />Exhibit T T-20 May 2010