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Open-File Report 2015–1025

Geochemical Maps of Stream Sediments in Central Colorado, from New Mexico to Wyoming

By Robert G. Eppinger, Stuart A. Giles, and Terry L. Klein

Thumbnail of and link to report PDF (54.1 MB)Abstract

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

    For additional information contact:
    Director, Central Mineral and Environmental Resources Science Center
    U.S. Geological Survey
    Box 25046, MS–973
    Denver, CO 80225
    http://minerals.cr.usgs.gov/

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Suggested citation:

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)



Contents

Introduction

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

References Cited


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