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<br />sulfides. The analysis should be able to detect ai: least <br />.5$ 2n5, .5$PbS, .5$ Fes or FeS2, 1$CaF2, and .5$ Cu sulfides. <br />A major and trace element geochemical analysis mu~;t also be <br />performed. This analysis must include wet chemical analysis, <br />x-ray diffraction and x-ray fluorescence on representative <br />samples or the ore. A demonstration that the samples were <br />representative must also be included. <br />Nature of the tailings material. Leachate analyses of <br />representative samples of tailings material will be required. <br />Additionally, regular third-party monitoring of the tailings <br />stream would be required to ensure that the tailings remain <br />within parameters of the tailings impoundment design. <br />Tailings impoundment. Most likely, the tailings impoundment <br />will require some kind of liner depending on the nature of the <br />tailings material. The amount of hydraulic head on the liner <br />would have some bearing on the type of liner that would be <br />required. A plan for temporary tailings stabilization to <br />prevent blowing of the material off site would be required. <br />A plan for an impervious cap on the tailings impoundment after <br />the operation for final decommissioning would probably also be <br />required. This would depend on the nature of the tailings. <br />These are some of the concerns the Division would consider during <br />a review of a permit application for the Boulder Mill. Other <br />concerns may arise as data are studied and the proposed operation <br />and reclamation plans are reviewed. <br />If you have any questions, please contact me. <br />Sincerely, <br />(/~"" <br />Carl B. Mount <br />Senior Environmental Protection Specialist <br />C:HENDRCKS.LET <br />