Y-Nb mineralization produced by greisenization of a biotite granite. Placers occur associated to the weathered zone.
Ref.:
- Revista Brasileira de Geociências 30(2):238-241, (2000).
- Orris, G.J., and Grauch, R.I. (2002): Rare earth element mines, deposits, and occurrences. USGS Open-File Report 02-189.
Coarse-grained porphyritic albite granite intruding paleoproterozoic acid volcanic and pyroclastic rocks. Three major facies are known in the granite: - Rapakivi granite - Biotite granite - Coarsed-grained porphyritic albite granite.
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