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Rio Preto valley, Abadia dos Dourados, Coromandel district, Minas Gerais, Brazil

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Latitude & Longitude (WGS84): 18° 17' 12'' South , 47° 24' 27'' West
Latitude & Longitude (decimal): -18.28667,-47.40750
GeoHash:G#: 6uwrcpnbm
Locality type:Valley
Köppen climate type:Aw : Tropical savanna, wet

Numerous quarries were excavated in alluvial deposits along the Rio Preto (“Black River” in English), north of the town of Coromandel. Note that there are other rivers by the same name in Minas Gerais, and there is a Rio Preto municipality along the southern border of the state. The 22nd largest diamond found in Brazil, the “Coromandel I” (1934) and the 26th largest, the “Brasília” (1947), were found along the Rio Preto. These weighed 180 carats and 176 carats, respectively. Specific locality information for those two diamonds is unavailable, but six quarries and groups of quarries that appear to have been extensively worked are clearly visible along the river by satellite imagery. From east to west, these include the following:

1) complex of at least six separate quarries in 18° 17' 23" S; 47° 29' 15" W
2) two quarries in 18° 17' 13" S; 47° 24' 53" W
3) complex of at least three separate quarries in 18° 16' 45" S; 47° 23' 16" W
4) one quarry in 18° 16' 53" S; 47° 23' 16" W
5) complex of at least two quarries in 18° 17' 3" S; 47° 21' 56" W
6) complex of at least six quarries in 18° 19' 9" S; 47° 19' 45" W

The spot shown on the locality map is roughly in the “center” of this group of sites.

NK, January 2017

Mineral List

1 valid mineral.

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Machado, I. F., and Figueirôa, S. F. de M. (2001): 500 years of mining in Brazil: a brief review. Resources Policy, 27: 9-24.

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