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Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africai
Regional Level Types
Jagersfontein MineMine
JagersfonteinTown
Kopanong Local MunicipalityMunicipality
Xhariep District MunicipalityMunicipality
Free StateProvince
South AfricaCountry

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PhotosMapsSearch
Type:
Mine
Mindat Locality ID:
3076
Long-form identifier:
mindat:1:2:3076:5
GUID (UUID V4):
3a053df1-1fc9-4e08-8cdb-ae73f2be24ac
Other Languages:
View 1 more...
Afrikaans:
Jagersfonteinmyn, Jagersfontein, Kopanong Plaaslike Munisipaliteit, Xhariep-distriksmunisipaliteit, Vrystaat, Suid-Afrika
French:
Mine de Jagersfontein, Kopanong, Xhariep, État-Libre, Afrique du Sud
Vietnamese:
Mỏ Jagersfontein, Free State, Nam Phi


A diamond mine in a kimberlite pipe, owned by De Beers.

Diamonds were first found at Jagersfontein farm in 1870, but it took until 1878 to recognize that this occurrence was indeed a pipe.

It was first worked from an open pit because the presence of a thick dolerite sheet made the sidewalls much more stable than those at Kimberley or Koffiefontein.

Underground mining only commenced in 1910.

The mine was worked almost continuously until 1971, except for two short periods of time during the 1930s depression and the Second World War.

Its final closure was due to a decreasing diamond grade and increasing mining costs at greater depths.

Jagersfontein mine produced diamonds of extremely high quality, but the diamond grades were very low.

It also produced a number of the world's largest diamonds, among them the 971.75 ct Excelsior and the 640 ct Jubilee (previously named Reitz).

Among researchers, the deposit is known as a prime locality for mantle xenoliths, some of which are interpreted to have been derived from 300-500 km depths.

Located 2½ miles from Jagersfontein.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


25 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

ⓘ Armalcolite
Formula: (Mg,Fe2+)Ti2O5
ⓘ Baryte
Formula: BaSO4
ⓘ Baryte var. Cerian Barite
Formula: BaSO4
ⓘ Bultfonteinite
Formula: Ca2(HSiO4)F · H2O
ⓘ Chromite
Formula: Fe2+Cr3+2O4
ⓘ Corundum
Formula: Al2O3
ⓘ Diamond
Formula: C
ⓘ Diopside
Formula: CaMgSi2O6
ⓘ Enstatite
Formula: Mg2Si2O6
ⓘ 'Fayalite-Forsterite Series'
ⓘ Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Geikielite
Formula: MgTiO3
ⓘ Graphite
Formula: C
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Lindsleyite
Formula: (Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
ⓘ Mathiasite (TL)
Formula: (Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Type Locality:
ⓘ Natrolite
Formula: Na2Al2Si3O10 · 2H2O
ⓘ Pectolite
Formula: NaCa2Si3O8(OH)
ⓘ Perovskite
Formula: CaTiO3
ⓘ Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrope
Formula: Mg3Al2(SiO4)3
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var. Agate
ⓘ Rutile
Formula: TiO2
ⓘ Spinel
Formula: MgAl2O4
ⓘ Thomsonite-Ca
Formula: NaCa2[Al5Si5O20] · 6H2O
ⓘ Titanite
Formula: CaTi(SiO4)O
ⓘ 'UM1984-36-SiO:CaNaZr'
Formula: ~(Zr,Na,Ca)3Si6O17

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGraphite1.CB.05aC
ⓘDiamond1.CB.10aC
Group 2 - Sulphides and Sulfosalts
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘSpinel4.BB.05MgAl2O4
ⓘChromite4.BB.05Fe2+Cr3+2O4
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘCorundum4.CB.05Al2O3
ⓘGeikielite4.CB.05MgTiO3
ⓘArmalcolite4.CB.15(Mg,Fe2+)Ti2O5
ⓘPerovskite4.CC.30CaTiO3
ⓘLindsleyite4.CC.40(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
ⓘMathiasite (TL)4.CC.40(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
ⓘQuartz4.DA.05SiO2
ⓘvar. Agate4.DA.05SiO2
ⓘRutile4.DB.05TiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
ⓘvar. Cerian Barite7.AD.35BaSO4
Group 9 - Silicates
ⓘPyrope9.AD.25Mg3Al2(SiO4)3
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘBultfonteinite9.AG.80Ca2(HSiO4)F · H2O
ⓘEnstatite9.DA.05Mg2Si2O6
ⓘDiopside9.DA.15CaMgSi2O6
ⓘPectolite9.DG.05NaCa2Si3O8(OH)
ⓘFluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
ⓘPhlogopite9.EC.20KMg3(AlSi3O10)(OH)2
ⓘNatrolite9.GA.05Na2Al2Si3O10 · 2H2O
ⓘThomsonite-Ca9.GA.10NaCa2[Al5Si5O20] · 6H2O
Unclassified
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'UM1984-36-SiO:CaNaZr'-~(Zr,Na,Ca)3Si6O17

List of minerals for each chemical element

HHydrogen
Hⓘ BultfonteiniteCa2(HSiO4)F · H2O
Hⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Hⓘ NatroliteNa2Al2Si3O10 · 2H2O
Hⓘ PectoliteNaCa2Si3O8(OH)
Hⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Hⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
CCarbon
Cⓘ DiamondC
Cⓘ GraphiteC
OOxygen
Oⓘ Armalcolite(Mg,Fe2+)Ti2O5
Oⓘ BaryteBaSO4
Oⓘ BultfonteiniteCa2(HSiO4)F · H2O
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ CorundumAl2O3
Oⓘ DiopsideCaMgSi2O6
Oⓘ EnstatiteMg2Si2O6
Oⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Oⓘ GeikieliteMgTiO3
Oⓘ IlmeniteFe2+TiO3
Oⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Oⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Oⓘ NatroliteNa2Al2Si3O10 · 2H2O
Oⓘ PectoliteNaCa2Si3O8(OH)
Oⓘ PerovskiteCaTiO3
Oⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Oⓘ PyropeMg3Al2(SiO4)3
Oⓘ QuartzSiO2
Oⓘ RutileTiO2
Oⓘ SpinelMgAl2O4
Oⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ Baryte var. Cerian BariteBaSO4
Oⓘ UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
FFluorine
Fⓘ BultfonteiniteCa2(HSiO4)F · H2O
Fⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Naⓘ NatroliteNa2Al2Si3O10 · 2H2O
Naⓘ PectoliteNaCa2Si3O8(OH)
Naⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Naⓘ UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
MgMagnesium
Mgⓘ Armalcolite(Mg,Fe2+)Ti2O5
Mgⓘ DiopsideCaMgSi2O6
Mgⓘ EnstatiteMg2Si2O6
Mgⓘ GeikieliteMgTiO3
Mgⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Mgⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Mgⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgⓘ PyropeMg3Al2(SiO4)3
Mgⓘ SpinelMgAl2O4
AlAluminium
Alⓘ CorundumAl2O3
Alⓘ NatroliteNa2Al2Si3O10 · 2H2O
Alⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Alⓘ PyropeMg3Al2(SiO4)3
Alⓘ SpinelMgAl2O4
Alⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
SiSilicon
Siⓘ BultfonteiniteCa2(HSiO4)F · H2O
Siⓘ DiopsideCaMgSi2O6
Siⓘ EnstatiteMg2Si2O6
Siⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Siⓘ NatroliteNa2Al2Si3O10 · 2H2O
Siⓘ PectoliteNaCa2Si3O8(OH)
Siⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Siⓘ PyropeMg3Al2(SiO4)3
Siⓘ QuartzSiO2
Siⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Garnet GroupX3Z2(SiO4)3
Siⓘ UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
SSulfur
Sⓘ BaryteBaSO4
Sⓘ PyriteFeS2
Sⓘ Baryte var. Cerian BariteBaSO4
KPotassium
Kⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Kⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Kⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Caⓘ BultfonteiniteCa2(HSiO4)F · H2O
Caⓘ DiopsideCaMgSi2O6
Caⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Caⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Caⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Caⓘ PectoliteNaCa2Si3O8(OH)
Caⓘ PerovskiteCaTiO3
Caⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
TiTitanium
Tiⓘ Armalcolite(Mg,Fe2+)Ti2O5
Tiⓘ GeikieliteMgTiO3
Tiⓘ IlmeniteFe2+TiO3
Tiⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Tiⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Tiⓘ PerovskiteCaTiO3
Tiⓘ RutileTiO2
Tiⓘ TitaniteCaTi(SiO4)O
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
Crⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Crⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
FeIron
Feⓘ Armalcolite(Mg,Fe2+)Ti2O5
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ IlmeniteFe2+TiO3
Feⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Feⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Feⓘ PyriteFeS2
SrStrontium
Srⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
ZrZirconium
Zrⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Zrⓘ Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
Zrⓘ UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
BaBarium
Baⓘ BaryteBaSO4
Baⓘ Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Baⓘ Baryte var. Cerian BariteBaSO4

Fossils

This region is too big or complex to display the fossil list, try looking at smaller subregions.

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Jagersfontein_Mine


This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Rocks & Minerals (xxxx) 21:130.
Dana 7: I: 150.
(n.d.)
Truswell, J. F. (1955) A PETROLOGICAL STUDY OF DOLERITE SILLS IN THE JAGERSFONTEIN DIAMOND MINE, ORANGE FREE STATE. Transactions of the Royal Society of South Africa, 34 (3), 409-416. doi:10.1080/00359195509518999
Mathias, M., Siebert, J.C., Rickwood, P.C. (1970) Some Aspects of the Mineralogy and Petrology of Ultramafic Xenoliths in Kimberlite. Contributions to Mineralogy and Petrology: 26: 75-123.
Borley, G. D., Suddaby, P. (1975) Stressed pyroxenite nodules from the Jagersfontein kimberlite. Mineralogical Magazine, 40, 6-12. doi:10.1180/minmag.1975.040.309.02
Gübelin, E., Wolgensinger, M. (1976) Edelstenen. Uitgeverij Artis, Brussel (in Dutch).
Exley, Richard A., Smith, Joseph V., Dawson, J. Barry (1983) Alkremite, garnetite and eclogite xenoliths from Bellsbank and Jagersfontein, South Africa. American Mineralogist, 68 (5-6), 512-516.
Boyd, F.R, Dawson, J.B, Smith, J.V (1984) Granny Smith diopside megacrysts from the kimberlites of the Kimberley area and Jagersfontein, South Africa. Geochimica et Cosmochimica Acta, 48 (2), 381-384. doi:10.1016/0016-7037(84)90258-8
Dawson, J.B., Smith, J.V. (1986) Relationships between eclogites and certain megacrysts from the Jagersfontein kimberlite, South Africa. Lithos, 19 (3), 325-330.
Winterburn, Peter A, Harte, Ben, Gurney, John J (1990) Peridotite xenoliths from the Jagersfontein kimberlite pipe: I. Primary and primary-metasomatic mineralogy. Geochimica et Cosmochimica Acta, 54 (2), 329-341. doi:10.1016/0016-7037(90)90322-c
Hops, J.J., Gurney, J.J., Harte, B. (1992) The jagersfontein Cr-poor megacryst suite — towards a model for megacryst petrogenesis. Journal of Volcanology and Geothermal Research, 50 (1), 143-160. doi:10.1016/0377-0273(92)90042-c
Pyle, Joseph M., Haggerty, Stephen E. (1998) Eclogites and the Metasomatism of Eclogites from the Jagersfontein Kimberlite: Punctuated Transport and Implications for Alkali Magmatism. Geochimica et Cosmochimica Acta, 62 (7), 1207-1231. doi:10.1016/s0016-7037(98)00040-4
Cook, Robert B. (2000) Diamond, Jagersfontein Mine, Free State Province, South Africa. Rocks & Minerals, 75 (5), 344-349. doi:10.1080/00357520009603092
Tappert, Ralf, Stachel, Thomas, Harris, Jeff W., Muehlenbachs, Karlis, Ludwig, Thomas, Brey, Gerhard P. (2005) Diamonds from Jagersfontein (South Africa): messengers from the sublithospheric mantle. Contributions to Mineralogy and Petrology, 150 (5), 505-522. doi:10.1007/s00410-005-0035-6
Field, Matthew, Stiefenhofer, Johann, Robey, Jock, Kurszlaukis, Stephan (2008) Kimberlite-hosted diamond deposits of southern Africa: A review. Ore Geology Reviews: 34(1): 33-75.
Haggerty, S.E. (2017) Majorite-indicative ultradeep (>300 km) xenoliths with spinel associations from the Jagersfontein kimberlite, South Africa. South African Journal of Geology, 120 (1), 1-20. doi:10.25131/gssajg.120.1.1
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