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O'Toole deposit, Fortaleza de Minas, Minas Gerais, Brazili
Regional Level Types
O'Toole depositDeposit
Fortaleza de MinasMunicipality
Minas GeraisState
BrazilCountry

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Key
Latitude & Longitude (WGS84):
20° 53' 55'' South , 46° 42' 45'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Itaú de Minas14,888 (2012)18.2km
Passos98,752 (2012)22.7km
São Sebastião do Paraíso68,654 (2013)29.0km
Alpinópolis13,286 (2012)33.9km
Cássia14,391 (2012)41.3km


A suspended Ni mine, 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.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


33 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Brenner et al (1990) Econ Geol 85:904-920
Arsenopyrite
Formula: FeAsS
Reference: Marchetto (1990) Econ Geol 85:921-927
Bismuth
Formula: Bi
Reference: Marchetto (1990) Econ Geol 85:921-927
'Bravoite'
Formula: (Fe,Ni)S2
Reference: Brenner et al (1990) Econ Geol 85:904-920
Chalcopyrite
Formula: CuFeS2
Reference: Brenner et al (1990) Econ Geol 85:904-920
'Chlorite Group'
Reference: Brenner et al (1990) Econ Geol 85:904-920
Cobaltite
Formula: CoAsS
Reference: Brenner et al (1990) Econ Geol 85:904-920
Gersdorffite
Formula: NiAsS
Reference: Brenner et al (1990) Econ Geol 85:904-920
Gold
Formula: Au
Reference: Brenner et al (1990) Econ Geol 85:904-920
Graphite
Formula: C
Reference: Brenner et al (1990) Econ Geol 85:904-920
Hematite
Formula: Fe2O3
Reference: Brenner et al (1990) Econ Geol 85:904-920
Ilmenite
Formula: Fe2+TiO3
Reference: Brenner et al (1990) Econ Geol 85:904-920
Irarsite
Formula: (Ir,Ru,Rh,Pt)AsS
Reference: Brenner et al (1990) Econ Geol 85:904-920
Kotulskite
Formula: Pd(Te,Bi)
Reference: Brenner et al (1990) Econ Geol 85:904-920
Mackinawite
Formula: (Fe,Ni)9S8
Reference: Marchetto (1990) Econ Geol 85:921-927
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Brenner et al (1990) Econ Geol 85:904-920
Marcasite
Formula: FeS2
Reference: Brenner et al (1990) Econ Geol 85:904-920
Maucherite
Formula: Ni11As8
Reference: Marchetto (1990) Econ Geol 85:921-927
Melonite
Formula: NiTe2
Reference: Brenner et al (1990) Econ Geol 85:904-920
Nickeline
Formula: NiAs
Reference: Marchetto (1990) Econ Geol 85:921-927
Omeiite
Formula: (Os,Ru)As2
Reference: Marchetto (1990) Econ Geol 85:921-927
Osarsite
Formula: (Os,Ru)AsS
Reference: Marchetto (1990) Econ Geol 85:921-927
Pentlandite
Formula: (FexNiy)Σ9S8
Reference: Brenner et al (1990) Econ Geol 85:904-920
Platinum
Formula: Pt
Reference: Marchetto (1990) Econ Geol 85:921-927
Pyrite
Formula: FeS2
Reference: Brenner et al (1990) Econ Geol 85:904-920; Brenner et al (1990) Econ Geol 85:904-920
Pyrrhotite
Formula: Fe7S8
Reference: Brenner et al (1990) Econ Geol 85:904-920
Rheniite
Formula: ReS2
Reference: Marchetto (1990) Econ Geol 85:921-927
Silver
Formula: Ag
Reference: Marchetto (1990) Econ Geol 85:921-927
Sperrylite
Formula: PtAs2
Reference: Brenner et al (1990) Econ Geol 85:904-920
Sphalerite
Formula: ZnS
Reference: Brenner et al (1990) Econ Geol 85:904-920
Talc
Formula: Mg3Si4O10(OH)2
Reference: Brenner et al (1990) Econ Geol 85:904-920
Titanite
Formula: CaTi(SiO4)O
Reference: Brenner et al (1990) Econ Geol 85:904-920
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: Brenner et al (1990) Econ Geol 85:904-920
Valleriite
Formula: (Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Reference: Marchetto (1990) Econ Geol 85:921-927
Violarite
Formula: Fe2+Ni3+2S4
Reference: Brenner et al (1990) Econ Geol 85:904-920

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Bismuth1.CA.05Bi
Gold1.AA.05Au
Graphite1.CB.05aC
Platinum1.AF.10Pt
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Chalcopyrite2.CB.10aCuFeS2
Cobaltite2.EB.25CoAsS
Gersdorffite2.EB.25NiAsS
Irarsite2.EB.25(Ir,Ru,Rh,Pt)AsS
Kotulskite2.CC.05Pd(Te,Bi)
Mackinawite2.CC.25(Fe,Ni)9S8
Marcasite2.EB.10aFeS2
Maucherite2.AB.15Ni11As8
Melonite2.EA.20NiTe2
Nickeline2.CC.05NiAs
Omeiite2.EB.15a(Os,Ru)As2
Osarsite2.EB.20(Os,Ru)AsS
Pentlandite2.BB.15(FexNiy)Σ9S8
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Rheniite2.EB.35ReS2
Sperrylite2.EB.05aPtAs2
Sphalerite2.CB.05aZnS
Valleriite2.FD.30(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Violarite2.DA.05Fe2+Ni3+2S4
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Talc9.EC.05Mg3Si4O10(OH)2
Titanite9.AG.15CaTi(SiO4)O
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Bravoite'-(Fe,Ni)S2
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Silver1.1.1.2Ag
Platinum Group Metals and Alloys
Platinum1.2.1.1Pt
Semi-metals and non-metals
Bismuth1.3.1.4Bi
Graphite1.3.6.2C
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 9:8
Mackinawite2.7.2.1(Fe,Ni)9S8
Pentlandite2.7.1.1(FexNiy)Σ9S8
AmXp, with m:p = 1:1
Nickeline2.8.11.1NiAs
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 3:4
Violarite2.10.1.8Fe2+Ni3+2S4
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Cobaltite2.12.3.1CoAsS
Gersdorffite2.12.3.2NiAsS
Irarsite2.12.3.7(Ir,Ru,Rh,Pt)AsS
Marcasite2.12.2.1FeS2
Melonite2.12.14.1NiTe2
Omeiite2.12.2.7(Os,Ru)As2
Osarsite2.12.4.3(Os,Ru)AsS
Pyrite2.12.1.1FeS2
Sperrylite2.12.1.13PtAs2
Hydroxysulfides and Hydrated Sulfides
Valleriite2.14.1.1(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Miscellaneous
Maucherite2.16.16.1Ni11As8
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Talc71.2.1.3Mg3Si4O10(OH)2
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Bravoite'-(Fe,Ni)S2
'Chlorite Group'-
Kotulskite-Pd(Te,Bi)
Rheniite-ReS2

List of minerals for each chemical element

HHydrogen
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H TalcMg3Si4O10(OH)2
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
CCarbon
C GraphiteC
OOxygen
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O TalcMg3Si4O10(OH)2
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O MagnetiteFe2+Fe23+O4
O TitaniteCaTi(SiO4)O
O IlmeniteFe2+TiO3
O HematiteFe2O3
O Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg TalcMg3Si4O10(OH)2
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Mg Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
AlAluminium
Al Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
SiSilicon
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si TalcMg3Si4O10(OH)2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si TitaniteCaTi(SiO4)O
SSulfur
S PyriteFeS2
S PyrrhotiteFe7S8
S Pentlandite(FexNiy)Σ9S8
S ChalcopyriteCuFeS2
S CobaltiteCoAsS
S GersdorffiteNiAsS
S Irarsite(Ir,Ru,Rh,Pt)AsS
S SphaleriteZnS
S ViolariteFe2+Ni23+S4
S Bravoite(Fe,Ni)S2
S MarcasiteFeS2
S Mackinawite(Fe,Ni)9S8
S ArsenopyriteFeAsS
S Osarsite(Os,Ru)AsS
S RheniiteReS2
S Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
CaCalcium
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Ca TitaniteCaTi(SiO4)O
TiTitanium
Ti TitaniteCaTi(SiO4)O
Ti IlmeniteFe2+TiO3
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe MagnetiteFe2+Fe23+O4
Fe Pentlandite(FexNiy)Σ9S8
Fe ChalcopyriteCuFeS2
Fe IlmeniteFe2+TiO3
Fe ViolariteFe2+Ni23+S4
Fe Bravoite(Fe,Ni)S2
Fe MarcasiteFeS2
Fe HematiteFe2O3
Fe Mackinawite(Fe,Ni)9S8
Fe ArsenopyriteFeAsS
Fe Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
CoCobalt
Co CobaltiteCoAsS
NiNickel
Ni Pentlandite(FexNiy)Σ9S8
Ni GersdorffiteNiAsS
Ni MeloniteNiTe2
Ni ViolariteFe2+Ni23+S4
Ni Bravoite(Fe,Ni)S2
Ni NickelineNiAs
Ni MaucheriteNi11As8
Ni Mackinawite(Fe,Ni)9S8
CuCopper
Cu ChalcopyriteCuFeS2
Cu Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
ZnZinc
Zn SphaleriteZnS
AsArsenic
As CobaltiteCoAsS
As GersdorffiteNiAsS
As SperrylitePtAs2
As Irarsite(Ir,Ru,Rh,Pt)AsS
As NickelineNiAs
As MaucheriteNi11As8
As ArsenopyriteFeAsS
As Omeiite(Os,Ru)As2
As Osarsite(Os,Ru)AsS
RuRuthenium
Ru Irarsite(Ir,Ru,Rh,Pt)AsS
Ru Omeiite(Os,Ru)As2
Ru Osarsite(Os,Ru)AsS
RhRhodium
Rh Irarsite(Ir,Ru,Rh,Pt)AsS
PdPalladium
Pd KotulskitePd(Te,Bi)
AgSilver
Ag SilverAg
TeTellurium
Te KotulskitePd(Te,Bi)
Te MeloniteNiTe2
ReRhenium
Re RheniiteReS2
OsOsmium
Os Omeiite(Os,Ru)As2
Os Osarsite(Os,Ru)AsS
IrIridium
Ir Irarsite(Ir,Ru,Rh,Pt)AsS
PtPlatinum
Pt SperrylitePtAs2
Pt Irarsite(Ir,Ru,Rh,Pt)AsS
Pt PlatinumPt
AuGold
Au GoldAu
BiBismuth
Bi KotulskitePd(Te,Bi)
Bi BismuthBi

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
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.

Other Regions, Features and Areas containg this locality

South AmericaContinent
South America PlateTectonic Plate

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