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National Geochemical Database: Concentrate

Online link https://mrdata.usgs.gov/ngdb/concentrate/
Description Geochemistry of concentrates from the National Geochemical Database. Primarily inorganic elemental concentrations, most samples are from the continental US and Alaska.
Originators U.S. Geological Survey
Metadata Questions and answers

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Schematic map showing sample density in the conterminous US
Schematic map showing sample density in the conterminous US