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Koidu-Yengema, Kono District, Eastern Province, Sierra Leonei
Regional Level Types
Koidu-Yengema- not defined -
Kono DistrictDistrict
Eastern ProvinceProvince
Sierra LeoneCountry

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Latitude & Longitude (WGS84): 8° 37' 50'' North , 10° 58' 20'' West
Latitude & Longitude (decimal): 8.63064,-10.97241
GeoHash:G#: ec81n74jh
Köppen climate type:Am : Tropical monsoon climate
Nearest Settlements:
PlacePopulationDistance
Koidu88,000 (2015)1.5km
Simbakoro2,514 (2015)4.4km
Motema5,474 (2018)4.8km
Koyima2,705 (2015)10.0km
Giehun2,845 (2015)11.4km


Diamond mining area 250 km east of Freetown. Kimberlite
Mining area is 4km2 and comprised two kimberlite pipes and four dyke zones.
Crustal xenoliths are typically diabase, amphibolites and granite.

Regions containing this locality

African PlateTectonic Plate
West AfricaUN Subregion

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


Mineral List


15 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Apatite'
Reference: Mitchell, R. H. (Ed.). (2004). 8th International Kimberlite Conference: The C. Roger Clement volume (Vol. 1). Gulf Professional Publishing.
Calcite
Formula: CaCO3
Reference: Mitchell, R. H. (Ed.). (2004). 8th International Kimberlite Conference: The C. Roger Clement volume (Vol. 1). Gulf Professional Publishing.
'Chlorite Group'
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Diamond
Formula: C
Reference: Jim Ross (1989) Kimberlites and Related Rocks: Their composition, occurrence, origin and emplacement. Geological Society of Australia Incorporated, 1271p
Diopside
Formula: CaMgSi2O6
Reference: Mitchell, R. H. (Ed.). (2004). 8th International Kimberlite Conference: The C. Roger Clement volume (Vol. 1). Gulf Professional Publishing.
'Fayalite-Forsterite Series'
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.; Mitchell, R. H. (Ed.). (2004). 8th International Kimberlite Conference: The C. Roger Clement volume (Vol. 1). Gulf Professional Publishing.
Hematite
Formula: Fe2O3
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Ilmenite
Formula: Fe2+TiO3
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Iron
Formula: Fe
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Magnetite var: Titaniferous Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Perovskite
Formula: CaTiO3
Reference: Mitchell, R. H. (Ed.). (2004). 8th International Kimberlite Conference: The C. Roger Clement volume (Vol. 1). Gulf Professional Publishing.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Mitchell, R. H. (Ed.). (2004). 8th International Kimberlite Conference: The C. Roger Clement volume (Vol. 1). Gulf Professional Publishing.
Pyrite
Formula: FeS2
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Pyrrhotite
Formula: Fe7S8
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Rutile
Formula: TiO2
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Titanite
Formula: CaTi(SiO4)O
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
Titanomaghemite
Formula: Fe3+(Fe3+,Ti4+,Fe2+,◻)2O4
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.
'UM1985-06-O:CrFeMgTi'
Formula: (Fe2+,Mg,Ti,Cr)6O7
Reference: Tompkins, L.A., Haggerty, S.E. (1985): Groundmass oxide minerals in the Koidu kimberlite dikes. Sierra Leone. West Africa. Contrib. Mineral. Petrol.: 91: 245-263; in: Jambor, J.L., Grew, E.S., Puziewicz, J., Vanko, D.A. (1988): New mineral Names. American Mineralogist: 73: 444
Wüstite
Formula: FeO
Reference: Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Diamond1.CB.10aC
Iron1.AE.05Fe
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
var: Titaniferous Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
Perovskite4.CC.30CaTiO3
Rutile4.DB.05TiO2
Titanomaghemite4.BB.15Fe3+(Fe3+,Ti4+,Fe2+,◻)2O4
Wüstite4.AB.25FeO
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Diopside9.DA.15CaMgSi2O6
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Titanite9.AG.15CaTi(SiO4)O
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Chlorite Group'-
'Fayalite-Forsterite Series'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
'UM1985-06-O:CrFeMgTi'-(Fe2+,Mg,Ti,Cr)6O7

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Diamond1.3.6.1C
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX
Wüstite4.2.1.6FeO
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
Perovskite4.3.3.1CaTiO3
AX2
Rutile4.4.1.1TiO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
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 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Unclassified Minerals, Mixtures, etc.
'Apatite'-
'Chlorite Group'-
'Fayalite-Forsterite Series'-
Iron-Fe
Magnetite
var: Titaniferous Magnetite
-Fe2+(Fe3+,Ti)2O4
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Titanomaghemite-Fe3+(Fe3+,Ti4+,Fe2+,◻)2O4
'UM1985-06-O:CrFeMgTi'-(Fe2+,Mg,Ti,Cr)6O7

List of minerals for each chemical element

HHydrogen
H Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H PhlogopiteKMg3(AlSi3O10)(OH)2
CCarbon
C DiamondC
C CalciteCaCO3
OOxygen
O UM1985-06-O:CrFeMgTi(Fe2+,Mg,Ti,Cr)6O7
O Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
O HematiteFe2O3
O MagnetiteFe2+Fe23+O4
O IlmeniteFe2+TiO3
O Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4
O TitaniteCaTi(SiO4)O
O RutileTiO2
O WüstiteFeO
O PhlogopiteKMg3(AlSi3O10)(OH)2
O CalciteCaCO3
O PerovskiteCaTiO3
O DiopsideCaMgSi2O6
MgMagnesium
Mg UM1985-06-O:CrFeMgTi(Fe2+,Mg,Ti,Cr)6O7
Mg Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg DiopsideCaMgSi2O6
AlAluminium
Al Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Al PhlogopiteKMg3(AlSi3O10)(OH)2
SiSilicon
Si Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si TitaniteCaTi(SiO4)O
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si DiopsideCaMgSi2O6
SSulfur
S PyrrhotiteFe7S8
S PyriteFeS2
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca TitaniteCaTi(SiO4)O
Ca CalciteCaCO3
Ca PerovskiteCaTiO3
Ca DiopsideCaMgSi2O6
TiTitanium
Ti UM1985-06-O:CrFeMgTi(Fe2+,Mg,Ti,Cr)6O7
Ti Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
Ti IlmeniteFe2+TiO3
Ti TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4
Ti TitaniteCaTi(SiO4)O
Ti RutileTiO2
Ti PerovskiteCaTiO3
CrChromium
Cr UM1985-06-O:CrFeMgTi(Fe2+,Mg,Ti,Cr)6O7
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe UM1985-06-O:CrFeMgTi(Fe2+,Mg,Ti,Cr)6O7
Fe Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
Fe HematiteFe2O3
Fe MagnetiteFe2+Fe23+O4
Fe IlmeniteFe2+TiO3
Fe Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4
Fe PyrrhotiteFe7S8
Fe PyriteFeS2
Fe WüstiteFeO
Fe IronFe
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

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

Archean
2500 - 4000 Ma



ID: 3186476
Archean crystalline metamorphic rocks

Age: Archean (2500 - 4000 Ma)

Lithology: Orthogneiss/paragneiss

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]

Mesoarchean
2800 - 3200 Ma



ID: 3306524

Age: Mesoarchean (2800 - 3200 Ma)

Lithology: Plutonic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

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

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Haggerty, S. E., Hargraves, R. B., & Tompkins, L. A. (1990). Oxide mineralogy and magnetic properties of the Koidu kimberlite complex, Sierra Leone, west Africa. Geophysical Journal International, 100(2), 275-283.


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