File:McKelvey Box.jpg

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Summary

DescriptionMcKelvey Box.jpg	English: A "McKelvey box," designed by former USGS director Vincent McKelvey to illustrate different classes of mineral resources.
Date	21 April 2013, 21:01:21
Source	http://pubs.usgs.gov/circ/1995/circ1118/resass/fig4.html#fig4
Author	Vincent McKelvey, director, US Geological Survey

Licensing

This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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