A USGS carbonatite database from 2009 (https://pubs.usgs.gov/of/2009/1139/ see Appendix 1 data Excel file) has 61 carbonatite deposits listed of which 12 contain Nb, RE and P. The 12 include 4 from your Table (Ondurakorume, Araxa, Catalao I and Tapira) plus 8 others not listed in your Table including Mt Weld in Australia. (Dreadnought Resources (ASX DRE) WA Mangaroon Project also has Nb, Re + P). I appreciate your posts.
Ann: West Arunta Project - High Grade Nb-Ta in Weathered Zone, page-319
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