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Santo Antônio do Bonito Creek, Coromandel district, Minas Gerais, Brazil

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Latitude & Longitude (WGS84): 18° 30' 33'' South , 46° 58' 22'' West
Latitude & Longitude (decimal): -18.50917,-46.97278
GeoHash:G#: 6uwwene2q
Locality type:Creek
Köppen climate type:Aw : Tropical savanna, wet
Name(s) in local language(s):Ribeirão Santo Antônio do Bonito

This locality has produced several of the largest diamonds ever found in Brazil, all coming from Quaternary alluvial deposits in the valley of the St. Antônio Bonito River. The geographic coordinates listed are for the site where the largest Brazilian diamond was found (the "Presidente Vargas," at 726.6 ct). Alluvial deposits along the stream also produced the "Darci Vargas" at 460.0 ct. (second largest), "Coromandel IV" at 400.5 ct. (fifth largest), "Diário de Minas" at 375.0 ct. (sixth largest), "Bonito I" at 346.0 ct. (ninth largest), and Vitório II at 328.0 ct. (tenth largest), but not all at the same site. Fernandes et al. (2014) showed locations of nine quarries (called "garimpos" in Brazil), both active and inactive, located 21-28 km ESE of Coromandel along the river.

NK, January 2017

Mineral List

6 valid minerals.

Regional Geology

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

1000 - 1600 Ma

ID: 3187036
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1000 - 1600 Ma)

Lithology: Low grade unclassified metamorphic rock

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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.


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Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K. (2014): The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil. Brazilian Jour. of Geology, 44(1): 91-103.

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