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INTRODUCTION <br />Leadville Mining & Milling Corporation has a mill near Leadville, Colorado <br />in Sections 28 and 33, T. 9 S, R. 80 W. Tailings from the mill will be discharged <br />into the tailings disposal area immediately south and east of the mill building on <br />Corporation property. The tailings are fine and will be ponded behind a <br />compacted soil dike. Soils for the dike will be excavated from the "reservoir" <br />area. <br />CTL/Thompson, Inc. was retained to study the permeability of the soils that <br />will be the sides and bottom of the tailings disposal area. This is the report of our <br />permeability study. The locations of our permeability holes are shown on Figure I <br />and their summary logs on Figure 2. The results of laboratory tests are on <br />Figures 3 and 4 and in Table 1. The results of our permeability tests are shown on <br />Figure 2. <br />SUMMARY <br />The tailings disposal area soils are colluvial. They appear to be two types. <br />Most of the tailings disposal area is over a lower permeability (k = 2 ft/yr to <br />7 ft/yr) soil. The uphill edge of the area appears to be over the leading edge of a <br />colluvial deposit with a permeable lens (5000 ft/yr) at about 8 feet. The lens is <br />about 1.5 feet thick but does not appear to extend under the entire area. <br />