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USGS Mineral Resources: Carbonatites of the world, explored deposits of Nb an...
From the site: "Information on carbonatite deposits containing niobium and rare earth elements from around the world with grade and tonnage models, geologic setting, mineralogy,... -
Rare Earth Element Geochemistry of Produced Waters in WY
Update of rare earth element data from oil and gas reservoirs. These data include major, minor, trace and rare earth element concentration of geologic formations in Wyoming oil... -
Rare Earth Element Geochemistry for Produced Waters, WY
These data represent major, minor, trace, isotopes, and rare earth element concentrations in geologic formations and water associated with oil and gas production. *Note - Link...