Carbonatites of the world, explored deposits of Nb and REE; database and grade and tonnage models

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Description Data on 60 of the 527 known carbonatites in the world, providing reliable quantitative data on ore tonnages and grades of niobium and REE.
Originators Berger, Vladimir I., Singer, Donald A., Orris, Greta J.
Publication U.S. Geological Survey Open-File Report 2009-1139
Metadata Questions and answers

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