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Kruisrivier cobalt mine, Farm Kruisrivier 74 JS, Middelburg, Nkangala District, Mpumalanga, South Africai
Regional Level Types
Kruisrivier cobalt mineMine
Farm Kruisrivier 74 JS- not defined -
Middelburg- not defined -
Nkangala DistrictDistrict
MpumalangaProvince
South AfricaCountry

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Key
Latitude & Longitude:
25° South , 29° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~125km
Locality type:


180 km NW of Johannesburg; 38 km due north of Middelburg. The deposit was worked out in the early 1930s, but more prospecting was carried out in about 1940.

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.

Detailed Mineral List:

Arsenolite
Formula: As2O3
Reference: Min Rec 27:6 pp417-428
Beryl
Formula: Be3Al2(Si6O18)
Reference: Min Rec 27:6 pp417-428
Chalcopyrite
Formula: CuFeS2
Reference: Min Rec 27:6 pp417-428
Cobaltite
Formula: CoAsS
Reference: Min Rec 27:6 pp417-428
Erythrite
Formula: Co3(AsO4)2 · 8H2O
Habit: Prismatic, acicular radiating aggregates
Colour: Various colours white, cream, pink to pale pink and pale rose, peach, dark and light purple
Description: Found in cracks and vugs near to the sulphide ore vein.
Reference: Cairncross, B. and Dixon, R. (1995) Minerals of South Africa. The Geological Society of South Africa: 204; Reeks, G. (1996) The Kruisrivier Cobalt Mine - Transvaal (South Africa). Mineralogical Record, 27(6), 417-428; Windisch, W. (2014) An introduction to micromounting; Atanasova, M., Cairncross, B. and Windisch, W.R. (2016) Microminerals of the Bushveld Complex, South Africa. Popular Geoscience Series 6, Council for Geoscience, Pretoria, South Africa, 435 pp
Fluorite
Formula: CaF2
Reference: Min Rec 27:6 pp417-428
Gold
Formula: Au
Reference: Min Rec 27:6 pp417-428
Heterogenite
Formula: Co3+O(OH)
Reference: Min Rec 27:6 pp417-428
Löllingite
Formula: FeAs2
Reference: Maria T. Atanasova photo ID: 1022754
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Min Rec 27:6 pp417-428
Millerite
Formula: NiS
Reference: Min Rec 27:6 pp417-428
Nickeline
Formula: NiAs
Reference: Min Rec 27:6 pp417-428
Picropharmacolite
Formula: Ca4Mg(AsO4)2(HAsO4)2 · 11H2O
Reference: Min Rec 27:6 pp417-428
Pyrite
Formula: FeS2
Reference: Mike Holahan and Graham Reeks (1989) Locality Data Sheet: Kruisrivier.
Safflorite
Formula: (Co,Ni,Fe)As2
Reference: Min Rec 27:6 pp417-428
Skutterudite
Formula: CoAs3
Reference: Min Rec 27:6 pp417-428

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Cobaltite2.EB.25CoAsS
Löllingite2.EB.15aFeAs2
Millerite2.CC.20NiS
Nickeline2.CC.05NiAs
Pyrite2.EB.05aFeS2
Safflorite2.EB.15a(Co,Ni,Fe)As2
Skutterudite2.EC.05CoAs3
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Arsenolite4.CB.50As2O3
Heterogenite4.FE.20Co3+O(OH)
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2
Group 8 - Phosphates, Arsenates and Vanadates
Erythrite8.CE.40Co3(AsO4)2 · 8H2O
Picropharmacolite8.CH.15Ca4Mg(AsO4)2(HAsO4)2 · 11H2O
Group 9 - Silicates
Beryl9.CJ.05Be3Al2(Si6O18)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Millerite2.8.16.1NiS
Nickeline2.8.11.1NiAs
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Cobaltite2.12.3.1CoAsS
Löllingite2.12.2.9FeAs2
Pyrite2.12.1.1FeS2
Safflorite2.12.2.11(Co,Ni,Fe)As2
Skutterudite2.12.17.1CoAs3
Group 4 - SIMPLE OXIDES
A2X3
Arsenolite4.3.9.1As2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Heterogenite6.1.4.2Co3+O(OH)
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 39 - HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
(AB)5[HXO4]2[XO4]2.xH2O
Picropharmacolite39.2.4.1Ca4Mg(AsO4)2(HAsO4)2 · 11H2O
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
A3(XO4)2·xH2O
Erythrite40.3.6.3Co3(AsO4)2 · 8H2O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)

List of minerals for each chemical element

HHydrogen
H ErythriteCo3(AsO4)2 · 8H2O
H HeterogeniteCo3+O(OH)
H MalachiteCu2(CO3)(OH)2
H PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
BeBeryllium
Be BerylBe3Al2(Si6O18)
CCarbon
C MalachiteCu2(CO3)(OH)2
OOxygen
O ErythriteCo3(AsO4)2 · 8H2O
O ArsenoliteAs2O3
O BerylBe3Al2(Si6O18)
O HeterogeniteCo3+O(OH)
O MalachiteCu2(CO3)(OH)2
O PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
FFluorine
F FluoriteCaF2
MgMagnesium
Mg PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
AlAluminium
Al BerylBe3Al2(Si6O18)
SiSilicon
Si BerylBe3Al2(Si6O18)
SSulfur
S ChalcopyriteCuFeS2
S CobaltiteCoAsS
S MilleriteNiS
S PyriteFeS2
CaCalcium
Ca FluoriteCaF2
Ca PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe LöllingiteFeAs2
CoCobalt
Co ErythriteCo3(AsO4)2 · 8H2O
Co CobaltiteCoAsS
Co HeterogeniteCo3+O(OH)
Co Safflorite(Co,Ni,Fe)As2
Co SkutteruditeCoAs3
NiNickel
Ni MilleriteNiS
Ni NickelineNiAs
CuCopper
Cu ChalcopyriteCuFeS2
Cu MalachiteCu2(CO3)(OH)2
AsArsenic
As ErythriteCo3(AsO4)2 · 8H2O
As ArsenoliteAs2O3
As CobaltiteCoAsS
As NickelineNiAs
As PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
As Safflorite(Co,Ni,Fe)As2
As SkutteruditeCoAs3
As LöllingiteFeAs2
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Freiberg, R.B. (1907) Note on the cobalt lodes of the Transvaal. Transactions of the Geological Society of South Africa, volume 10, 10-12.
Mellor, E.T. (1907) Note on the field relations of the Transvaal cobalt lodes. Transactions of the Geological Society of South Africa, volume 10, 36-43.
Reeks, G. (1996) The Kruisrivier Cobalt Mine - Transvaal (South Africa). Mineralogical Record, 27(6), 417-428.
Atanasova, M., Cairncross, B. and Windisch, W.R. (2016) Microminerals of the Bushveld Complex, South Africa. Popular Geoscience Series 6, Council for Geoscience, Pretoria, South Africa, 435 pp.

External Links

http://www.fosagams.co.za/content/introduction-micromounting-wolf-windisch [Windisch, W. (2014) An introduction to micromounting. - Photo of Erythrite from Kruisrivier]

Other Regions, Features and Areas containing this locality

Somali PlateTectonic Plate
South Africa

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