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Douradinho River valley, Coromandel, Coromandel district, Minas Gerais, Brazil

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Latitude & Longitude (WGS84): 18° 37' 46'' South , 47° 7' 41'' West
Latitude & Longitude (decimal): -18.62972,-47.12833
GeoHash:G#: 6uwqp8d4n
Locality type:Valley
Köppen climate type:Aw : Tropical savanna, wet
Name(s) in local language(s):Rio Douradinho


Diamonds have been found in alluvial deposits along the Douradinho River (Rio Douradinho). Unfortunately, there is more than one Douradinho River in western Minas Gerais, so one must specify the Coromandel area to locate the diamond-bearing one. The Douradinho River is a tributary to the Dourados River, and both the Dourados and Douradinho have long been recognized as separate localities that sourced alluvial diamonds (e.g., see Table 2 in Machado and Figueirôa, 2001). In 1949 the fourth largest diamond ever found in Brazil, the "Presidente Dutra" at 408 carats, was discovered along the Douradinho River (no more precise locality information is available). Several quarries (called "garimpos" in Brazil) are located along the river, and the geographic coordinates used for the locality in mindat.org is for one site of extensive quarrying operations.

The geology of the Douradinho area was studied by Andrade and Chaves (2009) who recognized hill-slope reworked conglomerates derived from Upper Cretaceous conglomerates of the Capacete Formation, Mata da Corda Group. The Capacete is the secondary source for diamonds that were reworked from kimberlites and kamafugites (primary sources) into the even younger deposits (tertiary sources) of both colluvial (hill-slope) and alluvial deposits in the valley. The geological map supplied by those authors (their Figure 2), along with several excellent field photographs, provide marvelous insight to the terrain and deposits.

NK, January 2017


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9 valid minerals.

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Brazil
  • Minas Gerais
    • Coromandel district

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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Palache, C., Berman, H., & Frondel, C. (1951): The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 833.
Machado, I. F., and Figueirôa, S. F. de M. (2001): 500 years of mining in Brazil: a brief review. Resources Policy, 27: 9-24.
Andrade, K. E., and Chaves, M. L. S. C. (2009): Geologia e a redistribuição sedimentary pós-Cretácica dos depósitos diamantíferos da região ao sul fe Coromandel (MG). Geonomos, 17(1): 27-36.
Karfunkel, J., Hoover, D., Fernandes, A. F., Sgarbi, G. N. C., Kambrock, K., and Oliveira, G. D. (2014): Diamonds from the Coromandel area, west Minas Gerais state, Brazil: an update and new data on surface sources and origin. Brazilian Journal of Geology, 44(2): 325-338.

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