National Mineral Resource Assessment

National Mineral Resource Assessment 1998: Estimates of the number and size of undiscovered mineral deposits in the US containing gold, silver copper, lead, and zinc. We show permissive tracts, areas where geological analysis indicates that deposits of a specific type may occur shallower than 1km. More info: https://MRData.usgs.gov/nmra/

Permissive tracts
legend for NMRA permissive tracts
Types of mineral deposits
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