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DISPOSAL OPTION <br />ADVANTAGES <br />DISADVANTAGES <br />• <br />• <br />Complete /permanent isolation from <br />active surface environment <br />Little potential to impact deep <br />• <br />• <br />Inefficient material placement, no <br />compaction control <br />May not accommodate all material <br />Inside underground mine <br />groundwater systems <br />requiring disposal <br />workings <br />• <br />No increase in potential for mine <br />water to impact Ralston Creek <br />• <br />No long -term maintenance <br />• <br />No engineering design requirements <br />• <br />Effective for long -term containment <br />if properly designed <br />• <br />Engineering design required to meet <br />long -term performance criteria <br />• <br />Can accommodate all material <br />requiring disposal <br />• <br />Stockpiling options limited during <br />construction <br />Capped waste rock pile <br />• <br />Efficient material placement and <br />compaction control <br />• <br />Borrow material for cap may not be <br />available onsite <br />• <br />Future inspections /maintenance <br />required <br />• <br />Complete removal from site of this <br />potential source of impacts to water <br />• <br />Extremely high cost relative to other <br />options <br />Offsite repository <br />quality <br />• <br />Could set regulatory precedent with <br />negative economic consequences for <br />mining industry and State <br />• <br />Local residents may object to heavy <br />truck traffic in the area for a year or <br />more <br />This summary indicates that placement in the underground has the most advantages and fewest <br />disadvantages versus other options. However, other options must also be considered for a number of <br />reasons as indicated in this report. Cotter intends to meet with DRMS and other regulatory agencies as <br />appropriate to discuss the findings of this report and to attain consensus approvals on the most appropriate <br />option, or combination of options, for disposal of alluvial fill source term materials from the <br />Schwartzwalder Mine site. <br />References <br />Agency for Toxic Substances and Disease Registry (ATSDR). 1999. Toxicological Profile for Uranium. <br />Division of Toxicology /Toxicology Information Branch, Atlanta, GA. <br />Battelle. 2001. Comparative risks of hazardous materials and non - hazardous materials truck shipment <br />accidents /incidents. Final Report. Prepared for Federal Motor Carrier Safety Administration. <br />Canada Nuclear Safety Commission (CNSC). 2010. Management of uranium mine waste rock and mill <br />tailings. Support Document to DIS- 10 -01. <br />Colorado Division of Minerals and Geology (DMG). 2002. Best practices in abandoned mine land <br />reclamation: the remediation of past mining activities. <br />24 <br />