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  • RS 28 Gold Occurrences of Colorado Colorado Geological Survey .

    Description. Colorado has been a major gold producing state since the 1860's and much of the state's early economic growth depended on the mining of gold. The initial gold discovery occurred in 1859 in Cherry Creek near the confluence with the South Platte River. Since that first placer gold discovery, the estimated total.

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  • USGS Mineral Resources On Line Spatial Data

    Mineral resources information, along with the geologic, geochemical, and geophysical information needed to understand and assess mineral resource potential.

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  • US Geological Survey Scientific Investigations Report 2006 5085

    Dec 1, 2016 . Version 1.0. Available only on the World Wide Web. Geochemical and Mineralogical Characterization of the Abandoned Valzinco (Lead Zinc) and Mitchell (Gold) Mine Sites Prior to Reclamation, Spotsylvania County, ia. By Jane M. Hammarstrom, Adam N. Johnson, Robert R. Seal II, Allen L. Meier,.

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