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Show 17 called the "mineral belt of Colorado." This mineral belt extends from the important mining districts in the San Juan Mountains northeast across the state into Boulder County northwest of Denver. In addition to deposits of the metals named, the mineral belt includes the large molbydenite deposit at Climax in Lake County and the tungsten deposits near Nederland in Boulder County. Of the numerous scattered deposits of the metals outside this zone only those of the Cripple Creek and Summitville districts have been of major importance. The mineral belt extends diagonally across the rugged granite mountain ranges which are flanked by faults and folded sedimentary rocks, where warm to hot mineralizing solutions have produced metalliferous veins and related deposits in Igneous and sedimentary rocks. The fluids with their metal content are believed to have originated from the same sources as the magmas that make the numerous sills, dikes, stocks and plugs of quartz monzonite found almost coextensive with the mineralization. Mineral deposits formed by warm to hot solutions are known as "hydrothermal deposits" and are important sources of metals throughout the world, Vanadium Deposits In contrast to the hydrothermal deposits the vanadium deposits shown on plate 1 are sedimentary in origin and unrelated to, as well as outside, the mineral belt. The |