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Vertical zoning in the orebody is shown by high iron and low manganese concentrations at the contacts, with an increase in manganese grade towards the centre of the body. Two seams are mined - the No.1 seam is on average 6 metres thick, with a depth of 400 metres at the N'Chwaning mine and a depth of
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The ore body was discovered in 1940 by
Assmang, and led to the acquisition of a manganese outcrop. The properties on which the ore is situated were subsequently acquired by Assmang, and led to the 1975 commissioning of the Gloria mine (medium grade carbonated ore) as well as the later commissioning
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N'Chwaning is considered a single vertical hoist shaft. N'Chwaning II is a vertical skip shaft, currently still in production with an underground crushing facility. N'Chwaning III has two main shafts - A vertical personnel shaft and a decline shaft. N'Chwaning III additionally has seven underground
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upgrading, responsible for the formation of a large majority of the mineral species described from the
Kalahari Manganese Fields. Zoning exists within the ore body both in the vertical and horizontal sense, where horizontal zoning is fault related and shows high grade
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having estimated reserves of 323.2 million tonnes of manganese ore grading 42.5% manganese. There are three shafts, designated as N'Chwaning, N'Chwaning II and N'Chwaning III. The majority of the major mineral finds documented originate from the N'Chwaning II shaft.
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The N'Chwaning mine is located on the farm N'Chwaning 267, from which the name is derived. The license area also includes what was formerly known as the Black Rock mine area, and is situated in the
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The N'Chwaning mines are situated in the
Kalahari Manganese Fields, with the primary ore hosted in the Hotazel Formation of the Griqualand West Sequence, forming part of the
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Kuleshov, V. N. (4 May 2012). "A superlarge deposit—Kalahari manganese ore field (Northern Cape, South Africa): Geochemistry of isotopes (δ13C and δ18O) and genesis".
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200 metres at the Gloria mine. The No.2 seam is stratigraphically placed above the No.1 seam, with ongoing mining using the N'Chwaning II infrastructure.
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in 1972, 1981 and 2004 respectively of the N'Chwaning I, I and III shafts.
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ore, intermediate areas show a very complex mineral assemblage (including
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N'Chwaning is known to produce high-quality mineral specimens of
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Manganocalcite with kutnohorite from the N'Chwaning II mine
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160:ores of the Kalahari Manganese Fields.
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308:"Nchwaning Manganese Mine - Wikimapia"
266:. assmang.co.za. 2012. Archived from
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356:"Down the famous N'chwaning II mine"
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117:. N'chwaning has one of the largest
16:Mine in Northern Cape, South Africa
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454:Manganese mines in South Africa
382:Lithology and Mineral Resources
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338:"Assmang Proprietary Limited"
459:Economy of the Northern Cape
360:capeminerals.blogspot.co.za
192:The ore body shows extreme
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261:"Nchwaning manganese mine"
31:The N'Chwaning II headgear
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94:Kalahari Manganese Field
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189:Transvaal Supergroup.
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111:Northern Cape Province
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153:and other minerals.
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268:the original
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231:Wessels mine
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123:South Africa
121:reserves in
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96:geologic map
53:South Africa
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236:Gloria mine
215:kutnohorite
203:hausmannite
187:Proterozoic
151:jouravskite
448:Categories
421:22°50′17″E
418:27°07′45″S
365:28 January
317:28 January
247:References
143:ettringite
59:Production
402:0024-4902
211:jacobsite
158:manganese
139:manganite
119:manganese
68:Manganese
225:See also
207:braunite
194:faulting
64:Products
37:Location
277:12 July
173:Geology
164:History
147:inesite
83:Assmang
79:Company
49:Country
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271:(PDF)
264:(PDF)
74:Owner
398:ISSN
367:2017
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