N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa
|Latitude & Longitude (WGS84):||27° 8' 7'' North , 22° 52' 13'' East|
|Latitude & Longitude (decimal):||27.13528,22.87028|
|Other regions containing this locality:||Sahara Desert|
|Köppen climate type:||BWh : Hot deserts climate|
A closed manganese mine owned by Assoc. Manganese Mines of South Africa, Ltd.
The north-western areas, where mining began, were noted for the presence of exceptional rhodochrosite specimens associated with mainly manganite and drusy secondary quartz. The ore consisted here mainly of the Hotazel Supergroup. Later mining shifted to the southern areas. Here well crystallized hausmannite, barite, hydroxyapophyllite, inesite, brucite and celestine where found and rhodochrosite became a rarity.(Extract from Cairncross et al, 1995)
Note: Majority of the red rhodochrosite specimens are from this mine and not N'Chwaning II mine.
48 valid minerals. 2 erroneous literature entries.
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
0 - 2.588 Ma
|Quaternary sedimentary rocks|
Rocks & Minerals (1986): 61: 7.
Cairncross, B. and Dixon, R., (1995) Minerals of South Africa. The Geological Society of South Africa.
Gutzmer, J. (1996). Genesis and alteration of the Kalahari and Postmasburg manganese deposits, Griqualand West, South Africa (Doctoral dissertation, Rand Afrikaans University).
Cairncross, B., Beukes, N. and Gutzmer, J. (1997): The Manganese Adventure – The South African Manganese Fields. Associated Ore & Metal Corporation Limited, Johannesburg, Republic of South Africa.
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa.
Cairncross, B. & Balayer, P. (2007): Neufund: Shigait aus den Kalahari-Manganfeldern, Südafrika. LAPIS 32 (4): 23-26 + 50.
Cairncross, B., and Beukes, N. J., (2013) The Kalahari Manganese Field, the adventure continues. Struik Nature Publishers, Cape Town, South Africa.
Cairncross, B. (2016). Shigaite: Connoisseur’s Choice. Rocks & Minerals, 91, 150-153.