Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Koffiefontein Mine, Koffiefontein, Xhariep District, Free State, South Africai
Regional Level Types
Koffiefontein MineMine
Koffiefontein- not defined -
Xhariep DistrictDistrict
Free StateProvince
South AfricaCountry

This page is currently not sponsored. Contact us for sponsorship opportunities.
Lock Map
Latitude & Longitude (WGS84):
29° 23' 59'' South , 25° 1' 0'' East
Latitude & Longitude (decimal):
Owned/operated by:
Locality type:

A diamond mine in a kimberlite pipe.

Diamonds were first discovered on the Koffiefontein farm in 1870. A few diggers investigated the property but it was soon abandoned due to the discovery of the richer pipes 110km to the North on the De Beers farm.

Mining re-started in 1878 the form of 1,700 small claims that were later (1894) amalgamated into Koffiefontein Mine Limited, a company established by Alfred Moseley, a London diamond merchant.

De Beers acquired control of Koffiefontein Mine Limited in 1911. Mining operations were then continuous until the advent of the Great Depression in 1932 when work was suspended.

Between 1950 and 1953, a prospecting shaft was sunk which was followed by limited production. The mine was reopened in 1970 and preparations for increased production were completed in August 1971. Immediately after completing the preparations, production from the open pit commenced and proceeded to a depth of 270 metres.

Underground development started in 1974 through a sampling programme. Underground production briefly took place in 1982 but ceased soon thereafter due to the 1981 slump in the diamond market, before resuming again in March 1987. In February 2006, De Beers ceased mining when the old order mining right for Koffiefontein expired and in July of that year Petra Diamonds commenced operating the mine under care and maintenance conditions, before completing the acquisition of the mine in July 2007.

From its first beginnings, Koffiefontein has been noted for the excellent quality of its diamonds, with Edwin Streeter commenting in 1898 that its diamonds were of the “first water” (meaning of exceptional clarity).

Regions containing this locality

African PlateTectonic Plate

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

4 valid minerals. 1 (TL) - type locality of 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:

Formula: C
Reference: Mining Ann. Review (1985): 147.
Formula: CaMgSi2O6
Reference: Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Contributions to Mineralogy and Petrology 26, 75-123.
Diopside var: Chromian Diopside
Formula: Ca(Mg,Cr)Si2O6
Reference: Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Contributions to Mineralogy and Petrology 26, 75-123.
'Fayalite-Forsterite Series'
Reference: Field, M., Stiefenhofer, J., Robey, J., and Kurszlaukis, S. (2008): Ore Geology Reviews 34, 33-75.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Contributions to Mineralogy and Petrology 26, 75-123.
Goldschmidtite (TL)
Formula: KNbO3
Type Locality:
Reference: Meyer, N.A., Wenz, M.D., Walsh, J.P.S., Jacobsen, S.D., Locock, A.J. and Harris, J.W. (2018) Goldschmidtite, IMA 2018-034. CNMNC Newsletter No. 44, August 2018, page xxx; Mineralogical Magazine: 82: xxx–xxx.
Formula: MgO
Reference: Field, M., Stiefenhofer, J., Robey, J., and Kurszlaukis, S. (2008): Ore Geology Reviews 34, 33-75.
Periclase var: Ferropericlase
Formula: (Mg,Fe)O
Reference: Field, M., Stiefenhofer, J., Robey, J., and Kurszlaukis, S. (2008): Ore Geology Reviews 34, 33-75.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 4 - Oxides and Hydroxides
var: Ferropericlase4.AB.25(Mg,Fe)O
Group 9 - Silicates
var: Chromian Diopside9.DA.15Ca(Mg,Cr)Si2O6
Unclassified Minerals, Rocks, etc.
'Fayalite-Forsterite Series'-
'Garnet Group'-X3Z2(SiO4)3
Goldschmidtite (TL)-KNbO3

List of minerals arranged by Dana 8th Edition classification

Semi-metals and non-metals
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Unclassified Minerals, Mixtures, etc.
var: Chromian Diopside-Ca(Mg,Cr)Si2O6
'Fayalite-Forsterite Series'-
'Garnet Group'-X3Z2(SiO4)3
Goldschmidtite (TL)-KNbO3
var: Ferropericlase

List of minerals for each chemical element

C DiamondC
O GoldschmidtiteKNbO3
O Periclase (var: Ferropericlase)(Mg,Fe)O
O Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
O Garnet GroupX3Z2(SiO4)3
O PericlaseMgO
O DiopsideCaMgSi2O6
Mg Periclase (var: Ferropericlase)(Mg,Fe)O
Mg Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Mg PericlaseMgO
Mg DiopsideCaMgSi2O6
Si Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Si Garnet GroupX3Z2(SiO4)3
Si DiopsideCaMgSi2O6
K GoldschmidtiteKNbO3
Ca Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Ca DiopsideCaMgSi2O6
Cr Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Fe Periclase (var: Ferropericlase)(Mg,Fe)O
Nb GoldschmidtiteKNbO3

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

Jurassic - Permian
145 - 298.9 Ma

ID: 3309804

Age: Phanerozoic (145 - 298.9 Ma)

Lithology: Sedimentary (karoo)

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

251.902 - 298.9 Ma

ID: 2234951
Volksrust Formation of Ecca Group of Karoo Supergroup

Age: Phanerozoic (251.902 - 298.9 Ma)

Stratigraphic Name: Volksrust Formation

Description: Mudrock

Reference: Council for Geoscience. Geologic map of South Africa, 1:1M. National Science Councils of South Africa. [41]

251.902 - 298.9 Ma

ID: 3189153
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 298.9 Ma)

Stratigraphic Name: Karoo Supergroup

Comments: Karoo Basin

Lithology: Sedimentary rocks

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]

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


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Some Aspects of the Mineralogy and Petrology of Ultramafic Xenoliths in Kimberlite. Contributions to Mineralogy and Petrology 26, 75-123.
Mining Annual Review (1985): 147.
Izraeli, E.S., Harris, J.W., and Navon, O. (2004): Fluid and mineral inclusions in cloudy diamonds from Koffiefontein, South Africa. Geochmica et Cosmochimica Acta: 68: 2561-2575.
Field, M., Stiefenhofer, J., Robey, J., and Kurszlaukis, S. (2008): Kimberlite-hosted diamond deposits of southern Africa: A review. Ore Geology Reviews 34, 33-75.

External Links

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.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 19, 2019 15:29:18 Page generated: April 19, 2019 15:02:31
Go to top of page