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Bruce Mine, Gamagara Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africai
Regional Level Types
Bruce MineMine
Gamagara Local MunicipalityMunicipality
John Taolo Gaetsewe District MunicipalityDistrict Municipality
Northern CapeProvince
South AfricaCountry

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Latitude & Longitude (WGS84):
27° 49' 2'' South , 23° 0' 35'' East
Latitude & Longitude (decimal):
-27.81748,23.00973
GRN:
S19E15
Type:
Mine
Köppen climate type:
BSh : Hot semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Kathu9,219 (2012)14.1km
Kuruman9,093 (2012)58.1km
Mindat Locality ID:
234320
Long-form identifier:
mindat:1:2:234320:7
GUID (UUID V4):
0


A high-grade iron ore mine neighbouring the Sishen mine. Currently (2022) part of the Khumani mine owned by Assmang. The mine was previously part of the Bruce, King and Mokaning ("BKM") Project, which refers to the farms on which the iron ore resources are located.

Mn minerals are found within Wolhaarkop chert breccia. They are found in the upper portion of the breccia among void-fills. The outer part of the fills consists of norrishite, followed by serandite + albite + feldspar + granular sugilite. The cores of some vugs have armbrusterite and/or fibrous sugilite. There are also unzoned assemblages of similar mineralogy, but with minor kentrolite, strontianite and witherite. Dating of fibrous sugilite yields the age of 620.2 ± 3.3 Ma, thus younger for the Kalahari Manganese Fields assemblages.

Moore et al. (2015) mention that borehole AKH49, located in the King farm, contained a sugilite-bearing assemblage within the Wolhaarkop breccia.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


14 valid minerals.

Rock Types Recorded


Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine
Formula: NaFe3+Si2O6
ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ Armbrusterite
Formula: K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
ⓘ Baryte
Formula: BaSO4
ⓘ Braunite
Formula: Mn2+Mn3+6(SiO4)O8
ⓘ Celsian
Formula: Ba(Al2Si2O8)
ⓘ 'Feldspar Group'
ⓘ Hausmannite
Formula: Mn2+Mn3+2O4
ⓘ Kentrolite
Formula: Pb2Mn3+2(Si2O7)O2
ⓘ 'K Feldspar'
ⓘ Norrishite ?
Formula: KLiMn3+2(Si4O10)O2
ⓘ Quartz
Formula: SiO2
ⓘ Serandite
Formula: NaMn2+2Si3O8(OH)
ⓘ Strontianite
Formula: SrCO3
ⓘ Sugilite
Formula: KNa2Fe3+2Li3[Si12O30]
ⓘ Witherite
Formula: BaCO3

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘHausmannite4.BB.10Mn2+Mn3+2O4
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘStrontianite5.AB.15SrCO3
ⓘWitherite5.AB.15BaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
Group 9 - Silicates
ⓘBraunite9.AG.05Mn2+Mn3+6(SiO4)O8
ⓘKentrolite9.BE.80Pb2Mn3+2(Si2O7)O2
ⓘSugilite9.CM.05KNa2Fe3+2Li3[Si12O30]
ⓘAegirine9.DA.25NaFe3+Si2O6
ⓘSerandite9.DG.05NaMn2+2Si3O8(OH)
ⓘNorrishite ?9.EC.20KLiMn3+2(Si4O10)O2
ⓘArmbrusterite9.EG.65K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
ⓘCelsian9.FA.30Ba(Al2Si2O8)
ⓘAlbite9.FA.35Na(AlSi3O8)
Unclassified
ⓘ'Feldspar Group'-
ⓘ'K Feldspar'-

List of minerals for each chemical element

HHydrogen
Hⓘ SeranditeNaMn22+Si3O8(OH)
Hⓘ ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
LiLithium
Liⓘ NorrishiteKLiMn23+(Si4O10)O2
Liⓘ SugiliteKNa2Fe23+Li3[Si12O30]
CCarbon
Cⓘ StrontianiteSrCO3
Cⓘ WitheriteBaCO3
OOxygen
Oⓘ AegirineNaFe3+Si2O6
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ BaryteBaSO4
Oⓘ BrauniteMn2+Mn63+(SiO4)O8
Oⓘ CelsianBa(Al2Si2O8)
Oⓘ HausmanniteMn2+Mn23+O4
Oⓘ KentrolitePb2Mn23+(Si2O7)O2
Oⓘ NorrishiteKLiMn23+(Si4O10)O2
Oⓘ QuartzSiO2
Oⓘ SeranditeNaMn22+Si3O8(OH)
Oⓘ StrontianiteSrCO3
Oⓘ SugiliteKNa2Fe23+Li3[Si12O30]
Oⓘ WitheriteBaCO3
Oⓘ ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
NaSodium
Naⓘ AegirineNaFe3+Si2O6
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ SeranditeNaMn22+Si3O8(OH)
Naⓘ SugiliteKNa2Fe23+Li3[Si12O30]
Naⓘ ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ CelsianBa(Al2Si2O8)
SiSilicon
Siⓘ AegirineNaFe3+Si2O6
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ BrauniteMn2+Mn63+(SiO4)O8
Siⓘ CelsianBa(Al2Si2O8)
Siⓘ KentrolitePb2Mn23+(Si2O7)O2
Siⓘ NorrishiteKLiMn23+(Si4O10)O2
Siⓘ QuartzSiO2
Siⓘ SeranditeNaMn22+Si3O8(OH)
Siⓘ SugiliteKNa2Fe23+Li3[Si12O30]
Siⓘ ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
SSulfur
Sⓘ BaryteBaSO4
KPotassium
Kⓘ NorrishiteKLiMn23+(Si4O10)O2
Kⓘ SugiliteKNa2Fe23+Li3[Si12O30]
Kⓘ ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
MnManganese
Mnⓘ BrauniteMn2+Mn63+(SiO4)O8
Mnⓘ HausmanniteMn2+Mn23+O4
Mnⓘ KentrolitePb2Mn23+(Si2O7)O2
Mnⓘ NorrishiteKLiMn23+(Si4O10)O2
Mnⓘ SeranditeNaMn22+Si3O8(OH)
Mnⓘ ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
FeIron
Feⓘ AegirineNaFe3+Si2O6
Feⓘ SugiliteKNa2Fe23+Li3[Si12O30]
SrStrontium
Srⓘ StrontianiteSrCO3
BaBarium
Baⓘ BaryteBaSO4
Baⓘ CelsianBa(Al2Si2O8)
Baⓘ WitheriteBaCO3
PbLead
Pbⓘ KentrolitePb2Mn23+(Si2O7)O2

Other Regions, Features and Areas containing this locality

AfricaContinent
African PlateTectonic Plate
South Africa

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

Brief overview of the mine by its operating company Assmang:
web.archive.org (n.d.) https://web.archive.org/web/20220916125154/https://assmang.co.za/khumani-mine/
Moore, John M., Kuhn, Barbara K., Mark, Darren F., Tsikos, Harilaos (2011) A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. European Journal of Mineralogy, 23 (4) 661-673 doi:10.1127/0935-1221/2011/0023-2117
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