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1. New Insight Into the Controls on Platinum-Group Element Mineralization in the Allard Stock, La Plata Mountains, Southwestern Colorado

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The Allard stock is a mass of mostly alkaline felsic to intermediate intrusive rocks that were emplaced ~65 Ma during the formation of the La Mountain laccolithic complex. Formation of the Allard stock was accompanied by zones of mineralization that tend to be concentrated along northeast-trending fractures. Geologic surveys since the 1930s have documented the occurrence of copper mineralization within the stock along with economic concentrations...
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