Title from web page last updated Oct. 22, 2007 (viewed Jan. 7, 2008).
Summary
The U.S. Geological Survey provides access to a map of mineral resources in the United States. Users can view the map by individual state or the entire country.
System Details
Mode of access: Internet from the USGS Mineral Resources web site. Address as of 12/12/06: http://mrdata.usgs.gov/; current access is available via PURL.