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O'Toole deposit, Fortaleza de Minas, Minas Gerais, Brazil

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 20° South , 46° West (est.)
Margin of Error:~11km
Köppen climate type:Cwa : Monsoon-influenced humid subtropical climate

Ni mine in operation, 6 km SW of Fortaleza de Minas.

This Ni-​Cu-​PGE sulfide deposit is hosted by Archean komatiitic rocks of the Morro do Ferro greenstone belt.

Mineral List

33 valid minerals.

This page contains all mineral locality references listed on 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 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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Taufen, P. M., & Marchetto, C. M. (1989): Tropical weathering control of Ni, Cu, Co, and platinum group element distributions at the O'Toole Ni-Cu sulphide deposit, Minas Gerais, Brazil. Journal of Geochemical Exploration, 32(1-3), 185-197.
Brenner, T. L.; Teixeira, N. A.; Oliveira, J. A. L.; Franke, N. D.; Thompson, J. F. H. (1990): The O'Toole nickel deposit, Morro do Ferro greenstone belt, Brazil. Economic Geology 85, 904-920.

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