Geochemical Maps of Stream Sediments in Central Colorado, from
New Mexico to Wyoming

By Robert G. Eppinger, Stuart A. Giles, and Terry L. Klein

2015

U.S. Geological Survey Open-File Report 2015-1025

ABSTRACT:

The U.S. Geological Survey (USGS) recently 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.

DISCLAIMERS:

Any use of trade, product, or firm names is for descriptive purposes only and
does not imply endorsement by the U.S. Government.

Although this information product, for the most part, is in the public domain,
it also contains copyrighted materials as noted in the text.  Permission to
reproduce copyrighted items for other than personal use must be secured from
the copyright owner.

Although these data have been processed successfully on a computer system at
the U.S. Geological Survey, no warranty expressed or implied is made regarding
the display or utility of the data on any other system, or for general or
scientific purposes, nor shall the act of distribution constitute any such
warranty. The U.S. Geological Survey shall not be held liable for improper
or incorrect use of the data described and/or 
contained herein.

This data base, identified as Open-File Report 2015-1025, has been approved
for release and publication by the Director of the U.S. Geological Survey.
Although this database has been subjected to rigorous review and is
substantially complete, the U.S. Geological Survey reserves the right to
revise the data pursuant to further analysis and review. Furthermore, it
is released on condition that neither the U.S. geological Survey nor the
U.S. Government may be held liable for any damages resulting from its
authorized or unauthorized use.

CONTENTS:

00Readme.txt
of2015-1025.pdf

datafiles:

	CCAP_Geochemistry.gdb.zip
		CCAP_boundary
		CCAP_geochemistry_samples

	Layers.zip -- "element"_ppm-R.lyr, percent, conductivity, factors, pH, and
			scintillometry layers

	Shapefiles.zip
		CCAP_boundary.shp (.dbf/.prj/.sbn/.sbx/shp.xml/shx)
		CCAP_geochemistry_samples.shp (.dbf/.prj/.sbn/.sbx/shp.xml/shx)
metadata
	CCAP_boundary.xml
	CCAP_geochemistry_samples.xml
	Layers.xml

	
TO ACCESS THE DATA

The data files can be downloaded via the web from http://pubs.usgs.gov/of/2015/1025
or from http://dx.doi.org/10.30133/ofr20151025.

The text product is a Portable Document Format (.pdf) pamphlet which requires
Adobe Acrobat for viewing. Acrobat software runs on a variety of systems, and is
available for download free of charge from Adobe at http://www.adobe.com.

ArcReader is available free at: http://www.esri.com/software/arcgis/arcreader/.

Software Recommended:
Adobe Acrobat (6.x, 7.x, or 8.x), or Adobe Acrobat Pro (6.x, 7.x, or 8.x),
or the free Adobe Reader (6.x, 7.x, or 8.x), 8.x is preferred.

ArcGIS 9.3 or newer preferred.