Estimates of the number and size of undiscovered mineral deposits in the US containing gold, silver copper, lead, and zinc.
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nmra-kml.zip (Compressed, all tracts 5.5M bytes)
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nmra.zip (zipped shapefile, all tracts 7.1M bytes)
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About the database tables and fields
Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the United States
1998 Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the United States
Data Base for Undiscovered Deposits of Base and Precious Metals Released on CD-ROM
