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The Leadville Mill M1990-057 <br /> EXHIBIT A—LEGAL DESCRIPTION &LOCATION MAP <br /> Page 3-4 <br /> • Deposits were originally deposited as sulfides, and probably as a mixture, in <br /> varying proportions, of galena, and pyrite; <br /> • Deposits were deposited from aqueous solutions; <br /> • The process of deposition was a metasomatic interchanging between the <br /> materials brought in by the solutions and those forming the country rocks, <br /> consequently they do not fill pre-existing cavities; <br /> • Ore currents from which they were deposited did not come directly from <br /> below, but were more probably descending currents; and <br /> • Currents probably derived the material of which the ore deposits are formed <br /> mainly from the porphyry bodies, which occur at horizons above the Blue <br /> Limestone. <br /> The geology is described in greater detail in USGS Professional Paper 148 by Emmons, <br /> Irving & Laughlin, 1927. <br /> 3.4 SOILS (SEc 6.3.2(a)) <br /> The mill sites soils, as described USDA-Salida, Colorado District office, were formed on <br /> glacial outwash sedimentary rock with slopes ranging from 3%to 35%. Leadville soil is <br /> very deep and well drained. If formed in glacial outwash. Typically, the surface layer <br /> consisted of dark grayish brown sandy loam 3+tf is generally less than 8 inches thick. <br /> The subsurface layer is pink stony sandy loam 7in thick. The subsoil is extremely stony <br /> clay loam 32in thick. The substratum is extremely stony loam to a depth of 60in or <br /> more. The soil is medium acidic to a depth of 8in and slightly acidic and neutral below <br /> that depth. Permeability is moderately slow, and available water capacity is moderate. <br /> Surface runoff is medium to very rapid, and the hazard of erosion of unprotected soil <br /> by water is moderate to very high. <br /> Areas that have been historically cleared (roads, benches) show very good re-growth <br /> without fertilizer or other amendments. <br /> The ma!-site se+Es,as deSffibed by k1SDA Salida, GeEeFade BiStFiceff+E , weFe feFFAe <br /> en glaeialeutwash sedimentary FeEk with slopes Eanging-freFA 31% te 3 ° . The se+is <br /> have stony eheraeteristiES Wh i sh ffede m iRate th Feegheet-thc se i is re#i'geneFally less than 6in thiek. AFeas that have been hiStWieally eleaFed (Feads, benehes4 <br /> Version 3.0 December 2020 <br />