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Bronkhorstfontein deposit, Blouberg Local Municipality, Capricorn District Municipality, Limpopo, South Africai
Regional Level Types
Bronkhorstfontein depositDeposit
Blouberg Local MunicipalityMunicipality (Rural)
Capricorn District MunicipalityDistrict
LimpopoProvince
South AfricaCountry

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Latitude & Longitude (WGS84):
23° 6' 33'' South , 28° 28' 46'' East
Latitude & Longitude (decimal):
-23.10921,28.47956
GRN:
S16E19
Type:
Deposit
Köppen climate type:
BSh : Hot semi-arid (steppe) climate
Mindat Locality ID:
216400
Long-form identifier:
mindat:1:2:216400:0
GUID (UUID V4):
0


Mn-rich oncoids in late Paleoproterozoic (ca. 1.9 Ga) shallow-water manganese ores. The farm Bronkhorstfontein 42 LR is located next to farm Baden 90 LR, both are mined by Nakedi Solutions (Pty) Ltd.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


5 valid minerals.

Detailed Mineral List:

ⓘ Braunite
Formula: Mn2+Mn3+6(SiO4)O8
ⓘ Cryptomelane
Formula: K(Mn4+7Mn3+)O16
ⓘ Hematite
Formula: Fe2O3
ⓘ Pyrolusite
Formula: Mn4+O2
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var. Chalcedony
Formula: SiO2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘHematite4.CB.05Fe2O3
ⓘQuartz
var. Chalcedony		4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘPyrolusite4.DB.05Mn4+O2
ⓘCryptomelane4.DK.05aK(Mn4+7Mn3+)O16
Group 9 - Silicates
ⓘBraunite9.AG.05Mn2+Mn3+6(SiO4)O8

List of minerals for each chemical element

OOxygen
Oⓘ BrauniteMn2+Mn63+(SiO4)O8
Oⓘ Quartz var. ChalcedonySiO2
Oⓘ CryptomelaneK(Mn74+Mn3+)O16
Oⓘ HematiteFe2O3
Oⓘ PyrolusiteMn4+O2
Oⓘ QuartzSiO2
SiSilicon
Siⓘ BrauniteMn2+Mn63+(SiO4)O8
Siⓘ Quartz var. ChalcedonySiO2
Siⓘ QuartzSiO2
KPotassium
Kⓘ CryptomelaneK(Mn74+Mn3+)O16
MnManganese
Mnⓘ BrauniteMn2+Mn63+(SiO4)O8
Mnⓘ CryptomelaneK(Mn74+Mn3+)O16
Mnⓘ PyrolusiteMn4+O2
FeIron
Feⓘ HematiteFe2O3

Other Regions, Features and Areas containing this locality

AfricaContinent
African PlateTectonic Plate
Somali 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

Coetzee, C. B. (1976) Mineral Resources of the Republic of South Africa (5th ed.). South Africa Dept. of Mines.p.172
M. O. Schaefer, J. Gutzmer and N. J. Beukes (2001): Late Paleoproterozoic Mn-rich oncoids: Earliest evidence for microbially mediated Mn precipitation. Geology 29, 835-838.
J. Gutzmer, J. Gutzmer, M. O. Schaefer, and N. J. Beukes (2002): Red Bed-Hosted Oncolitic Manganese Ore of the Paleoproterozoic Soutpansberg Group, Bronkhorstfontein, South Africa. Economic Geology, 97, 1151-1166.
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