Open-File Report 2015–1025
The U.S. Geological Survey has completed a series of geologic, mineral resource, and environmental assessment studies in the Rocky Mountains of central Colorado, from Leadville eastward to the range front and from New Mexico to the Wyoming border. Regional stream-sediment geochemical maps, useful for assessing mineral resources and environmental effects of historical mining activities, were produced as part of the study. The data portrayed in this 56-parameter portfolio of landscape geochemical maps serve as a geochemical baseline for the region, indicate element abundances characteristic of various lithologic terranes, and identify gross anthropogenic effects of historical mining. However, although reanalyzed in this study by modern, sensitive methods, the majority of the stream-sediment samples were collected in the 1970s. Thus, metal concentrations portrayed in these maps represent stream-sediment geochemistry at the time of collection.
First posted March 10, 2015
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Eppinger, R.G., Giles, S.A., and Klein, T.L., 2015, Geochemical maps of stream sediments in central Colorado, from New Mexico to Wyoming: U.S. Geological Survey Open-File Report 2015–1025, 120 p., https://dx.doi.org/10.3133/ofr20151025.
ISSN 2331-1258 (online)
Stream-Sediment Sampling and Analytical Methods
Geologic Setting of Central Colorado
Mineral Deposits of Central Colorado
Geographic Information System and Spatial Analysis of Geochemistry Data
Geochemistry Maps and Discussions