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Gakara Project (Karonge complex), Bujumbura Rural Province, Burundii
Regional Level Types
Gakara Project (Karonge complex)Project
Bujumbura Rural ProvinceProvince
BurundiCountry

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Key
Latitude & Longitude (WGS84):
3° 30' 7'' South , 29° 26' 57'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Manga1,000 (2008)2.3km
Bujumbura331,700 (2012)16.3km
Mwaro4,924 (2015)28.2km
Muramvya18,041 (2013)31.4km
Uvira170,391 (2012)36.5km


REE-bearing carbonatite (587 Ma old). A 20 X 20 km area near Gakara, 20 km SE of Bujumbura.

Discovered in 1936 by Belgian company Somuki (Société Minière de Muhinga et de Kigali), mined sporadically between 1948 and 1978.

The mineralised veins at the Gakara Project are discrete and narrow, and the mineralised material separates easily from the less dense host rock which, in itself, is amenable to manual digging. The veins range in thickness from a few centimetres to a few tens of centimetres. The veins have been shown to typically extend laterally for tens of metres, the longest recorded being around 40 metres, and have been observed to extend down to depths greater than 25 metres. The veins outcrop at surface on steep slopes or river incisions but are frequently under cover [ref: rainbowrareearths.com]

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


16 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

Baryte
Formula: BaSO4
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
'Bastnäsite'
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Cavoite
Formula: CaV4+3O7
Description: On-line version of Handbook page (http://rruff.info/doclib/hom/cavoite.pdf) is in fact that of cerianite-(Ce).
Reference: Handbook of Mineralogy
Cerianite-(Ce)
Formula: (Ce4+,Th)O2
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Cerite-(Ce)
Formula: (Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
Crandallite
Formula: CaAl3(PO4)(PO3OH)(OH)6
Reference: Berger, V.I., Singer, D.A., and Orris, G.J. (2009): Carbonatites of the World. Explored Deposits of Nb and REE - Database and Grade and Tonnage Models: U.S. Geological Survey Open-File Report 2009-1139, 17 p. and database.
'Florencite'
Description: Listed as crandalite-florencite in Lehman et al (1994)
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
'Fluocerite'
Reference: Van Wambeke, L. (1977): The Karonge rare earth deposits, Republic of Burundi: New mineralogical-geochemical data and origin of the mineralization. Mineralium Deposita. 12 (3), 373-380
Galena
Formula: PbS
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Goethite
Formula: α-Fe3+O(OH)
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Goyazite
Formula: SrAl3(PO4)(PO3OH)(OH)6
Reference: Berger, V.I., Singer, D.A., and Orris, G.J. (2009): Carbonatites of the World. Explored Deposits of Nb and REE - Database and Grade and Tonnage Models: U.S. Geological Survey Open-File Report 2009-1139, 17 p. and database.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Microcline
Formula: K(AlSi3O8)
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Molybdenite
Formula: MoS2
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
'Monazite'
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Pyrite
Formula: FeS2
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Pyromorphite
Formula: Pb5(PO4)3Cl
Reference: Van Wambeke, L. (1977): The Karonge rare earth deposits, Republic of Burundi: New mineralogical-geochemical data and origin of the mineralization. Mineralium Deposita. 12 (3), 373-380
Quartz
Formula: SiO2
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
'Rhabdophane Group'
Formula: (REE,Ca,Th)(PO4)·H2O
Reference: Lehmann, et al. (1994): REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimicae et Cosmochimica Acta, 58 (2), 985-992
Rhabdophane-(La)
Formula: La(PO4) · H2O
Reference: Van Wambeke, L. (1977): The Karonge rare earth deposits, Republic of Burundi: New mineralogical-geochemical data and origin of the mineralization. Mineralium Deposita. 12 (3), 373-380
Tridymite
Formula: SiO2
Reference: Van Wambeke, L. ( The Karonge rare earth deposits, Republic of Burundi: New mineralogical-geochemical data and origin of the mineralization. Mineralium Deposita. 12 (3), 373-380
Vermiculite
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Reference: Van Wambeke, L. ( The Karonge rare earth deposits, Republic of Burundi: New mineralogical-geochemical data and origin of the mineralization. Mineralium Deposita. 12 (3), 373-380

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Cavoite ?4.HE.40CaV4+3O7
Cerianite-(Ce)4.DL.05(Ce4+,Th)O2
Goethite4.00.α-Fe3+O(OH)
Quartz4.DA.05SiO2
Tridymite4.DA.10SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
Crandallite8.BL.10CaAl3(PO4)(PO3OH)(OH)6
Goyazite8.BL.10SrAl3(PO4)(PO3OH)(OH)6
Pyromorphite8.BN.05Pb5(PO4)3Cl
Rhabdophane-(La)8.CJ.45La(PO4) · H2O
Group 9 - Silicates
Cerite-(Ce)9.AG.20(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Microcline9.FA.30K(AlSi3O8)
Vermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Unclassified Minerals, Rocks, etc.
'Bastnäsite'-
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Florencite'-
'Fluocerite'-
'Monazite'-
'Rhabdophane Group'-(REE,Ca,Th)(PO4)·H2O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX2
Cerianite-(Ce)4.4.12.1(Ce4+,Th)O2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Rhabdophane-(La)40.4.7.2La(PO4) · H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Pyromorphite41.8.4.1Pb5(PO4)3Cl
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq·xH2O
Crandallite42.7.3.1CaAl3(PO4)(PO3OH)(OH)6
Goyazite42.7.3.3SrAl3(PO4)(PO3OH)(OH)6
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
Cerite-(Ce)52.4.6.1(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Vermiculite71.2.2d.3Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Tridymite75.1.2.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Bastnäsite'-
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Cavoite ?-CaV4+3O7
'Florencite'-
'Fluocerite'-
Kaolinite-Al2(Si2O5)(OH)4
'Monazite'-
'Rhabdophane Group'-(REE,Ca,Th)(PO4)·H2O

List of minerals for each chemical element

HHydrogen
H Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
H Goethiteα-Fe3+O(OH)
H KaoliniteAl2(Si2O5)(OH)4
H CrandalliteCaAl3(PO4)(PO3OH)(OH)6
H GoyaziteSrAl3(PO4)(PO3OH)(OH)6
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
H Rhabdophane-(La)La(PO4) · H2O
H Rhabdophane Group(REE,Ca,Th)(PO4)·H2O
OOxygen
O Cerianite-(Ce)(Ce4+,Th)O2
O Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
O BaryteBaSO4
O QuartzSiO2
O Goethiteα-Fe3+O(OH)
O MicroclineK(AlSi3O8)
O KaoliniteAl2(Si2O5)(OH)4
O CrandalliteCaAl3(PO4)(PO3OH)(OH)6
O GoyaziteSrAl3(PO4)(PO3OH)(OH)6
O PyromorphitePb5(PO4)3Cl
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
O TridymiteSiO2
O Rhabdophane-(La)La(PO4) · H2O
O Rhabdophane Group(REE,Ca,Th)(PO4)·H2O
O CavoiteCaV34+O7
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
MgMagnesium
Mg Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
AlAluminium
Al MicroclineK(AlSi3O8)
Al KaoliniteAl2(Si2O5)(OH)4
Al CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Al GoyaziteSrAl3(PO4)(PO3OH)(OH)6
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
SiSilicon
Si Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
Si QuartzSiO2
Si MicroclineK(AlSi3O8)
Si KaoliniteAl2(Si2O5)(OH)4
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Si TridymiteSiO2
PPhosphorus
P CrandalliteCaAl3(PO4)(PO3OH)(OH)6
P GoyaziteSrAl3(PO4)(PO3OH)(OH)6
P PyromorphitePb5(PO4)3Cl
P Rhabdophane-(La)La(PO4) · H2O
P Rhabdophane Group(REE,Ca,Th)(PO4)·H2O
SSulfur
S BaryteBaSO4
S PyriteFeS2
S GalenaPbS
S MolybdeniteMoS2
ClChlorine
Cl PyromorphitePb5(PO4)3Cl
KPotassium
K MicroclineK(AlSi3O8)
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CaCalcium
Ca Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
Ca CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Ca Rhabdophane Group(REE,Ca,Th)(PO4)·H2O
Ca CavoiteCaV34+O7
VVanadium
V CavoiteCaV34+O7
FeIron
Fe Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
Fe PyriteFeS2
Fe Goethiteα-Fe3+O(OH)
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
SrStrontium
Sr GoyaziteSrAl3(PO4)(PO3OH)(OH)6
MoMolybdenum
Mo MolybdeniteMoS2
BaBarium
Ba BaryteBaSO4
LaLanthanum
La Rhabdophane-(La)La(PO4) · H2O
CeCerium
Ce Cerianite-(Ce)(Ce4+,Th)O2
Ce Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
PbLead
Pb GalenaPbS
Pb PyromorphitePb5(PO4)3Cl
ThThorium
Th Cerianite-(Ce)(Ce4+,Th)O2
Th Rhabdophane Group(REE,Ca,Th)(PO4)·H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Van Wambeke, L. (1977) The Karonge rare earth deposits, Republic of Burundi: New mineralogical-geochemical data and origin of the mineralization. Mineralium Deposita, 12 (3), 373-380.
Lehmann, B., Nakai, S., Höhndorf, A., Brinckmann, J., Dulski, P., Hein, U.F., and Masuda, K. (1994) REE mineralization at Gakara, Burundi. Evidence for anomalous upper mantle in the western Rift Valley. Geochimica et Cosmochimica Acta, 58, 985-992.
Berger, V.I., Singer, D.A., and Orris, G.J. (2009) Carbonatites of the World. Explored Deposits of Nb and REE - Database and Grade and Tonnage Models. U.S. Geological Survey Open-File Report 2009-1139, 17 p. and database.

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