Bruce Mine, Gamagara Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africai
| Regional Level Types | |
|---|---|
| Bruce Mine | Mine |
| Gamagara Local Municipality | Municipality |
| John Taolo Gaetsewe District Municipality | District Municipality |
| Northern Cape | Province |
| South Africa | Country |
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Latitude & Longitude (WGS84):
27° 49' 2'' South , 23° 0' 35'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
234320
Long-form identifier:
mindat:1:2:234320:7
GUID (UUID V4):
70cb7648-5a8c-48aa-a9b0-7d5102efaea2
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 ElementsMineral List
12 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | 'Manganese' | 1.AE.30 | Mn |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hausmannite | 4.BB.10 | Mn2+Mn3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Strontianite | 5.AB.15 | SrCO3 |
| ⓘ | Witherite | 5.AB.15 | BaCO3 |
| Group 9 - Silicates | |||
| ⓘ | Braunite | 9.AG.05 | Mn2+Mn3+6(SiO4)O8 |
| ⓘ | Kentrolite | 9.BE.80 | Pb2Mn3+2(Si2O7)O2 |
| ⓘ | Sugilite | 9.CM.05 | KNa2Fe3+2Li3[Si12O30] |
| ⓘ | Aegirine | 9.DA.25 | NaFe3+Si2O6 |
| ⓘ | Serandite | 9.DG.05 | NaMn2+2Si3O8(OH) |
| ⓘ | Norrishite ? | 9.EC.20 | KLiMn3+2(Si4O10)O2 |
| ⓘ | Armbrusterite | 9.EG.65 | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'K Feldspar' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serandite | NaMn22+Si3O8(OH) |
| H | ⓘ Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| Li | Lithium | |
| Li | ⓘ Norrishite | KLiMn23+(Si4O10)O2 |
| Li | ⓘ Sugilite | KNa2Fe23+Li3[Si12O30] |
| C | Carbon | |
| C | ⓘ Strontianite | SrCO3 |
| C | ⓘ Witherite | BaCO3 |
| O | Oxygen | |
| O | ⓘ Aegirine | NaFe3+Si2O6 |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Braunite | Mn2+Mn63+(SiO4)O8 |
| O | ⓘ Hausmannite | Mn2+Mn23+O4 |
| O | ⓘ Kentrolite | Pb2Mn23+(Si2O7)O2 |
| O | ⓘ Norrishite | KLiMn23+(Si4O10)O2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Serandite | NaMn22+Si3O8(OH) |
| O | ⓘ Strontianite | SrCO3 |
| O | ⓘ Sugilite | KNa2Fe23+Li3[Si12O30] |
| O | ⓘ Witherite | BaCO3 |
| O | ⓘ Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| Na | Sodium | |
| Na | ⓘ Aegirine | NaFe3+Si2O6 |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Serandite | NaMn22+Si3O8(OH) |
| Na | ⓘ Sugilite | KNa2Fe23+Li3[Si12O30] |
| Na | ⓘ Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Si | Silicon | |
| Si | ⓘ Aegirine | NaFe3+Si2O6 |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Braunite | Mn2+Mn63+(SiO4)O8 |
| Si | ⓘ Kentrolite | Pb2Mn23+(Si2O7)O2 |
| Si | ⓘ Norrishite | KLiMn23+(Si4O10)O2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Serandite | NaMn22+Si3O8(OH) |
| Si | ⓘ Sugilite | KNa2Fe23+Li3[Si12O30] |
| Si | ⓘ Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| K | Potassium | |
| K | ⓘ Norrishite | KLiMn23+(Si4O10)O2 |
| K | ⓘ Sugilite | KNa2Fe23+Li3[Si12O30] |
| K | ⓘ Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| Mn | Manganese | |
| Mn | ⓘ Braunite | Mn2+Mn63+(SiO4)O8 |
| Mn | ⓘ Hausmannite | Mn2+Mn23+O4 |
| Mn | ⓘ Kentrolite | Pb2Mn23+(Si2O7)O2 |
| Mn | ⓘ Norrishite | KLiMn23+(Si4O10)O2 |
| Mn | ⓘ Serandite | NaMn22+Si3O8(OH) |
| Mn | ⓘ Manganese | Mn |
| Mn | ⓘ Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| Fe | Iron | |
| Fe | ⓘ Aegirine | NaFe3+Si2O6 |
| Fe | ⓘ Sugilite | KNa2Fe23+Li3[Si12O30] |
| Sr | Strontium | |
| Sr | ⓘ Strontianite | SrCO3 |
| Ba | Barium | |
| Ba | ⓘ Witherite | BaCO3 |
| Pb | Lead | |
| Pb | ⓘ Kentrolite | Pb2Mn23+(Si2O7)O2 |
Other Regions, Features and Areas containing this locality
Africa
- Kalahari DesertDesert
African PlateTectonic Plate
- Kalahari basinBasin
South Africa
- Northern Cape
- Postmasburg manganese fieldMining Field
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References
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
