Marshall Pass District
Uranium was discovered near Marshall Pass in northern Saguache and southeastern Gunnison counties, in 1955. Although the initial discoveries were uneconomic, they attracted further prospecting, which located commercial orebodies along the Chester thrust fault of Laramide age. The deposits are about six mile east of Sargents. The orebodies are primarily pyrite and pitchblende replacements of Paleozoic sedimentary rocks and Precambrian igneous and metamorphic rocks. Some uranophane and autunite are also present. Initial mining was by small open pits; underground mines were later developed.
Read more about this topic: Uranium Mining In Colorado
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