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Reprocessing Alternatives <br />There are many processes that have been developed to remove <br />metals from ores and these processes could potentially be applied <br />to remove toxic Metals from the five waste piles. The processes <br />fall into two categories: pyrometallurgical - processes using <br />heat: and hydrometallurgical - processes using crater solutions. <br />Facilities using these processes exist in several parts of the <br />country and could potentially reprocess materials from the Clear <br />Creek /Central City site. These processes could also potentially <br />be used at a facility constructed in the Clear Creek /Central City <br />site area. <br />The screening of technologies for reprocessing of tailings <br />and waste rock piles indicated that flotation as a reprocessing <br />alternative is technically feasible and can be implemented. In <br />addition, reprocessing of Gregory Tailings by gravity separation <br />to recover pyrite is technically feasible. To determine the <br />effectiveness and cost of reprocessing, laboratory bench scale <br />studies were conducted. The results are summarized in the <br />detailed analysis of remedial action alternatives. <br />summary of initial Screening <br />The following alternatives were considered for ro"diation <br />of the tailings and waste rock piles: <br />o No Action <br />a Slope Stabiliratiyn and Runon Control <br />o Capping (with soil cement or synthetic liners) <br />o Off -site disposal <br />o Cherrical Fixation (with kiln dust and three proprietary <br />agents) <br />o Reprocessing (flotation or gravity concentration) <br />Various options tinder each alternative were evaluated for <br />effectiveness, implamentability and Cost. Based on this <br />screening evaluation, options were selected for detailed <br />analyses. The results of the detailed analyses are provided in <br />the next section. <br />DETAILED ANALYSIS OF REMEDIAL ACTION ,ALTERNATIVES <br />Consistent with Section 300.68(h) of <br />Solid Waste and Emergency Response (OSWER) <br />19, and OSWER Directive No. 9355.0 -21, the <br />is <br />the NCP, the Office of <br />Directive No. 9355.0 - <br />remedial action <br />