Osamu Utsumi mine, Campo do Cercado, Caldas, Poços de Caldas alkaline complex, Minas Gerais, Brazil
|Latitude & Longitude (WGS84):||21° 56' 48'' South , 46° 29' 57'' West|
|Latitude & Longitude (decimal):||-21.94694,-46.49917|
|Name(s) in local language(s):||Mina Osamu Utsumi, Campo do Cercado, Caldas, complexo alcalino de Poços de Caldas|
Uranium mine, closed 1997, studied as natural analogue for nuclear waste disposal. Breccia pipe Uranium deposit.
43 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
1600 - 2500 Ma
|Paleoproterozoic intrusive and metamorphic terranes|
Age: Proterozoic (1600 - 2500 Ma)
Comments: Mixtures of metamorphic and intrusive or plutonic rocks, tracts known as crystalline, migmatitic terranes, moderately to highly metamorphosed rocks of unknown origin with or without intrusions. This classification is inherently prone to variable interpretation, as other compilers might distinguish some packages by their metamorphic or gneissic protoliths, and the associated age ranges may be more variable.
Lithology: Intrusive and metamorphic terranes
Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. 
Waber, N., Schorscher, H.D., and Peters, T. (1992) Hydrothermal and supergene uranium mineralization at the Osamu Utsumi mine, Poços de Caldas, Minas Gerais, Brazil. Journal of Geochemical Exploration, 45(1-3), 53-112.
Breit, G.N. and Hall, S.M. (2011) Deposit model for volcanogenic uranium deposits. U.S. Geological Survey Open-File Report 2011–1255, 5 p.