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1998 Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States

http://pubs.usgs.gov/circular/c1178/

Estimates of the tonnages and amounts of contained metal in undiscovered deposits, mineral deposit types.

by U.S. Geological Survey
U.S. Geological Survey Circular C-1178
Related topics:
Copper, Economic geology, Geospatial datasets, Gold, Lead, Metallic ores, Natural resource assessment, Silver, Zinc, Mineral deposit areas, Copper, Gold, Lead, Silver, Zinc, Shapefile
States or counties
United States

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