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Wr"_ITASCK <br /> Denver, Inc. <br /> • Meteoric water mobility procedure (MWMP)to estimate the static leach properties of the <br /> samples when exposed to meteoric water, <br /> • Net acid-generation (NAG) testing to estimate the amount of acidity resulting from the <br /> complete oxidation of the samples, <br /> • Solid-phase chemical composition to provide an upper bound for the total amount of metals <br /> and other elements that could potentially be mobilized from the samples, and <br /> • Humidity-cell tests (HCTs) to analyze the leaching behavior of the samples over time, <br /> including rates of release for various constituents under oxidizing conditions. <br /> 1.1 GEOLOGIC SUMMARY <br /> The Project is located on the southwestern flank of Pikes Peak in south-central Colorado within <br /> the Cripple Creek Mining District (the District). The district is localized within and adjacent to a <br /> Tertiary diatreme-intrusive complex that was emplaced approximately 28 million years ago, <br /> referred to herein as the diatreme. The geology of the district can be divided into the following <br /> two main types of materials (Lindgren and Ransome 1906): <br /> 1. The Precambrian metamorphic and igneous basement complex, and <br /> 2. The products of the Tertiary Cripple Creek volcanic activity. <br /> The basement complex consists primarily of three varieties of granite (Pikes Peak, Cripple Creek, <br /> and Spring Creek)that are closely related in composition.The remainder of the basement rock is <br /> mainly an olivine-syenite with genetically related diabase and anorthositic dikes (Lindgren and <br /> Ransome 1906). <br /> The Tertiary volcanic rocks compose the diatreme and include, in decreasing order of abundance, <br /> phonolite, latite-phonolite, syenite, lamprophyre, and trachydolerite. Breccias consisting of <br /> fragments of the basement complex and Tertiary volcanics occur mainly in the principal neck and <br /> in local volcanic vents, as well as in various accumulations that lay upon the uneven surface of <br /> the pre-volcanic plateau (Lindgren and Ransome 1906). The most notable breccia at the Project <br /> 2 <br />