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Big Water, Freetown layered complex, Western Area, Sierra Leonei
Regional Level Types
Big WaterAlluvial Deposit
Freetown layered complexComplex
Western AreaArea
Sierra LeoneCountry

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Latitude & Longitude (WGS84):
8° 17' 24'' North , 13° 9' 2'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Hastings5,121 (2014)10.1km
Waterloo19,750 (2014)10.3km
Kent1,804 (2015)10.4km
Freetown13,768 (2018)22.0km
Freetown802,639 (2018)23.8km


Heavy mineral concentrates from rivers and river terraces near York, Freetown Peninsula. Artisanal mining.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


24 valid minerals.

Detailed Mineral List:

Baddeleyite
Formula: ZrO2
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Braggite
Formula: PdPt3S4
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Cooperite
Formula: PtS
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Cuproiridsite
Formula: (Cu,Fe)Ir2S4
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Cuprorhodsite
Formula: (Cu1+0.5Fe3+0.5)Rh3+2S4
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Erlichmanite
Formula: OsS2
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
'Feldspar Group'
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Galena
Formula: PbS
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Gibbsite
Formula: Al(OH)3
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Goethite
Formula: α-Fe3+O(OH)
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Hematite
Formula: Fe2O3
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Hongshiite
Formula: PtCu
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Ilmenite
Formula: Fe2+TiO3
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Irarsite
Formula: (Ir,Ru,Rh,Pt)AsS
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Isoferroplatinum
Formula: Pt3Fe
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Laurite
Formula: RuS2
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Maghemite
Formula: (Fe3+0.670.33)Fe3+2O4
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Magnetite var. Titanium-bearing Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Osmium
Formula: (Os,Ir,Ru)
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
'Pyroxene Group'
Formula: ADSi2O6
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Quartz
Formula: SiO2
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Rutile
Formula: TiO2
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Sphalerite
Formula: ZnS
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Tulameenite
Formula: Pt2CuFe
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Vysotskite
Formula: PdS
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.
Zircon
Formula: Zr(SiO4)
Reference: Bowles, J. F., Suárez, S., Prichard, H. M., & Fisher, P. C. (2018). The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine, 1-30.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Hongshiite1.AG.45PtCu
Isoferroplatinum1.AG.35Pt3Fe
Osmium1.AF.05(Os,Ir,Ru)
Tulameenite1.AG.40Pt2CuFe
Group 2 - Sulphides and Sulfosalts
Braggite2.CC.35aPdPt3S4
Cooperite2.CC.35bPtS
Cuproiridsite2.DA.05(Cu,Fe)Ir2S4
Cuprorhodsite2.DA.05(Cu1+0.5Fe3+0.5)Rh3+2S4
Erlichmanite2.EB.05aOsS2
Galena2.CD.10PbS
Irarsite2.EB.25(Ir,Ru,Rh,Pt)AsS
Laurite2.EB.05aRuS2
Sphalerite2.CB.05aZnS
Vysotskite2.CC.35aPdS
Group 4 - Oxides and Hydroxides
Baddeleyite4.DE.35ZrO2
Gibbsite4.FE.10Al(OH)3
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Maghemite4.BB.15(Fe3+0.670.33)Fe3+2O4
Magnetite4.BB.05Fe2+Fe3+2O4
var. Titanium-bearing Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 9 - Silicates
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-
'Garnet Group'-X3Z2(SiO4)3
'Pyroxene Group'-ADSi2O6

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H GibbsiteAl(OH)3
OOxygen
O Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
O BaddeleyiteZrO2
O Maghemite(Fe3+0.670.33)Fe23+O4
O MagnetiteFe2+Fe23+O4
O Goethiteα-Fe3+O(OH)
O Pyroxene GroupADSi2O6
O GibbsiteAl(OH)3
O IlmeniteFe2+TiO3
O HematiteFe2O3
O RutileTiO2
O QuartzSiO2
O ZirconZr(SiO4)
O Garnet GroupX3Z2(SiO4)3
AlAluminium
Al GibbsiteAl(OH)3
SiSilicon
Si Pyroxene GroupADSi2O6
Si QuartzSiO2
Si ZirconZr(SiO4)
Si Garnet GroupX3Z2(SiO4)3
SSulfur
S SphaleriteZnS
S GalenaPbS
S CooperitePtS
S BraggitePdPt3S4
S VysotskitePdS
S Cuproiridsite(Cu,Fe)Ir2S4
S Cuprorhodsite(Cu1+0.5Fe3+0.5)Rh23+S4
S ErlichmaniteOsS2
S Irarsite(Ir,Ru,Rh,Pt)AsS
S LauriteRuS2
TiTitanium
Ti Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
FeIron
Fe Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Fe TulameenitePt2CuFe
Fe Maghemite(Fe3+0.670.33)Fe23+O4
Fe MagnetiteFe2+Fe23+O4
Fe Goethiteα-Fe3+O(OH)
Fe IlmeniteFe2+TiO3
Fe HematiteFe2O3
Fe Cuproiridsite(Cu,Fe)Ir2S4
Fe Cuprorhodsite(Cu1+0.5Fe3+0.5)Rh23+S4
Fe IsoferroplatinumPt3Fe
CuCopper
Cu TulameenitePt2CuFe
Cu HongshiitePtCu
Cu Cuproiridsite(Cu,Fe)Ir2S4
Cu Cuprorhodsite(Cu1+0.5Fe3+0.5)Rh23+S4
ZnZinc
Zn SphaleriteZnS
AsArsenic
As Irarsite(Ir,Ru,Rh,Pt)AsS
ZrZirconium
Zr BaddeleyiteZrO2
Zr ZirconZr(SiO4)
RuRuthenium
Ru Irarsite(Ir,Ru,Rh,Pt)AsS
Ru LauriteRuS2
Ru Osmium(Os,Ir,Ru)
RhRhodium
Rh Cuprorhodsite(Cu1+0.5Fe3+0.5)Rh23+S4
Rh Irarsite(Ir,Ru,Rh,Pt)AsS
PdPalladium
Pd BraggitePdPt3S4
Pd VysotskitePdS
OsOsmium
Os ErlichmaniteOsS2
Os Osmium(Os,Ir,Ru)
IrIridium
Ir Cuproiridsite(Cu,Fe)Ir2S4
Ir Irarsite(Ir,Ru,Rh,Pt)AsS
Ir Osmium(Os,Ir,Ru)
PtPlatinum
Pt TulameenitePt2CuFe
Pt HongshiitePtCu
Pt CooperitePtS
Pt BraggitePdPt3S4
Pt Irarsite(Ir,Ru,Rh,Pt)AsS
Pt IsoferroplatinumPt3Fe
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bowles, J.F., Suárez, S., Prichard, H.M., Fisher, P.C. (2018) The mineralogy, geochemistry and genesis of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. Mineralogical Magazine: 82: Supplement 1: 1-30.

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