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Kalgold, Kalahari Goldridge |
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North West Province, South Africa |
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Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Kalgold operations are located 60 kilometres south of Mafikeng and 300 km northwest of Johannesburg in the North West Province of South Africa.
The deposits are hosted within the Kraaipan Greenstone Belt, part of the larger NNW trending Amalia-Kraaipan Greenstone terrane of the Kaapvaal Craton, consisting of north trending linear belts of older (~3500 Ma) Archaean meta-volcanic and meta-sedimentary rocks, separated by granitoid units. This granite-greenstone terrane is the basement to the Witwatersrand Supergroup. For detail of the regional setting, see the Stella Layered Intrusion - Kalplats Project record.
Gold mineralisation occurs in shallow dipping quartz-carbonate veins, found in clusters or swarms, within a more steeply dipping (~65°E) sub-greenschist facies, magnetite-chert banded iron formation.
There are two groups of these sub-horizontal quartz-carbonate veins (IIA and IIB), which dip approximately 20 to 40°W. Group IIA are ladder veins preferentially developed in centimetre-scale Fe-rich mesobands, while Group IIB consists of large quartz-carbonate veins, which crosscut the entire orebody and extends into the footwall and hanging wall in places. Disseminated sulphide mineralisation, dominated by pyrite, is distributed around and between the shallow dipping quartz vein swarms.
The largest orebody encountered, D Zone and has been extensively mined within a single open pit operation over a strike length of 1500 metres. The ore zone is stratabound and varies from about 15 to 45 m in width. Extensions of this zone to the north are the A Zone, the A Zone West, the Watertank and Watermill zones. The Mealie Field Zone occurs adjacent to the D Zone.
Remaining resources in 2005 were: 32.4 Mt @ 1.69 g/t Au for 54.7 t Au. The mine is a Harmony Gold operation.
The most recent source geological information used to prepare this decription was dated: 2005.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Hammond N Q and Moore J M 2006 - Archaean lode gold mineralisation in banded iron formation at the Kalahari Goldridge deposit, Kraaipan Greenstone Belt, South Africa : in Mineralium Deposita v41 pp 483-503
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Hammond N Q, Moore J M and Sheets R W, 2007 - Physico-chemical conditions of ore-forming fluids associated with genesis of the Kalahari Goldridge deposit, Kraaipan Greenstone Belt, South Africa: in Ore Geology Reviews v30 pp 106-134
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Poujol, M., Anhaeusser, C.R. and Armstrong, R.A., 2002 - Episodic granitoid emplacement in the Archaean Amalia-Kraaipan terrane, South Africa: confirmation from single zircon U-Pb geochronology: in J. of African Earth Sciences v.35, pp. 147-161.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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