from publication: Kimberlite-hosted diamond deposits of southern Africa: A review | Following the discovery of diamonds in river deposits in central South Africa in the mid nineteenth century, it ...
WhatsApp: +86 18221755073This diamond became known as the "Star of South Africa" and sparked a major rush of European and American prospectors to South Africa. Later in 1869 diamonds were discovered in gravels along the Vaal River near the current town of Barkly West (Wagner, 1914). A large number of "diggers" began exploiting these gravels for diamonds and ...
WhatsApp: +86 18221755073Petrological, whole rock major element and mineral chemical analysis of mantle xenoliths from the Venetia kimberlite pipes (533 Ma) in South Africa reveals an apparently stratified cratonic mantle beneath the Central Zone of the Limpopo Mobile Belt (LMB) that separates the Kaapvaal and Zimbabwe Cratonsbined pressure–temperature (P–T) data …
WhatsApp: +86 18221755073Diamond-bearing gravels were discovered as early as 1903 close to the Limpopo River, 35km north east of the present mine. In 1969,De Beers launched a reconnaissance sampling programme to locate the source of these alluvials. Viable kimberlite pipes were discovered in 1980, construction of the mine began in 199…
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WhatsApp: +86 18221755073South Africa is characterized by multiple episodes of kimberlite intrusion. However, the age and Sr Nd isotopic compositions of the primary magma of most of the earlier emplacement events remain unresolved. Using in situ secondary ion mass spectrometry and laser ablation multi-collector inductively coupled plasma mass spectrometry, the U Pb ages and Sr …
WhatsApp: +86 18221755073Hand specimens were initially crushed using a jaw crusher. Individual rock chips were selected with careful inspection so as to avoid weathered surfaces or the incorporation of xenolithic material. ... Geochemistry of the Uintjiesberg kimberlite, South Africa: petrogenesis of an off-craton, Group 1, kimberlite. Lithos 74, 149–165. Howarth, G ...
WhatsApp: +86 18221755073Home / Archives / Vol. 7 (1998): Vol 7: International Kimberlite Conference, Cape Town / Extended Abstracts The geology and geochemistry of the Venetia kimberlite cluster, Northern Province, South Africa
WhatsApp: +86 18221755073The Kroonstad Group II Kimberlite Cluster is located 30 km north-east from the town of Kroonstad in the Free State Province of South Africa (Fig. 1) and is made up of six pipes and numerous intrusive dykes/sills.The six pipes are the Lace, Voorspoed, Besterskraal North, Silverbank, Normandien and Grootbosch.
WhatsApp: +86 18221755073The discovery of kimberlite pipes in South Africa during the 19th century changed the landscape of mining significantly. Notable mines such as the Kimberley Mine, also known as the "Big Hole," have become iconic symbols of the diamond rush era. This historical backdrop illustrates the connection between kimberlite and the economic motivations ...
WhatsApp: +86 18221755073The 0358-trend has no signi®cant Archaean representation and few major aeromagnetic linears either on or off the craton. The 0358-trending kimberlite corridors are sub-parallel to the south east coastline of South Africa and oceanic fracture zones, suggesting an association of on-land extensions and off-shore fracture zones (Marsh, 1973).
WhatsApp: +86 18221755073BlueRock Diamonds has started kimberlite processing from its second pipe, KV1, at the Kareevlei Diamond Mine in the Kimberley region of South Africa. The company has five known kimberlite pipes, including KV1, within the Kareevlei …
WhatsApp: +86 18221755073kimberlite and carbonatite magmas, and modification of magma compositions during ascent and emplacement, are discussed. Geological setting Wesselton Mine is situated 6.5 km southeast of Kimberley in the Northern Cape Province of South Africa and is one of five major diamondiferous kimberlite pipes (Kimberley, Wesselton, Dutoitspan, De Beers and
WhatsApp: +86 18221755073Twelve Group II and fourteen Group I kimberlite diatremes in central South Africa were examined for upper crustal xenoliths in order to estimate the extent of various lithological units of the Karoo Supergroup in the main Karoo basin at times of kimberlite eruption, the Cretaceous erosional history of the area, and the approximate vertical extent of the kimberlite diatremes prior to …
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WhatsApp: +86 18221755073The Uintjiesberg kimberlite diatreme occurs within the Proterozoic Namaqua–Natal Belt, South Africa, approximately 60 km to the southwest of the Kaapvaal craton boundary. It is a group I, calcite kimberlite that has an emplacement age of ∼100 Ma. Major and trace element data, in combination with petrography, are used to evaluate its petrogenesis and the nature of …
WhatsApp: +86 18221755073The Venetia kimberlite cluster in northernmost South Africa was emplaced at ~533 Ma (Allsopp et al., 1995) and is one of South Africa's most diamondiferous kimberlites with a grade of >1.2 ct/ton ...
WhatsApp: +86 18221755073STEPHAN KURSZLAUKIS AND WAYNE BARNETT 145 Volcanological and Structural Aspects of the Venetia Kimberlite Cluster – a case study of South African kimberlite maar-diatreme volcanoes Stephan Kurszlaukis De Beers GeoScience Centre, PO Box 82232, Southdale 2135, South Africa e-mail: Stephan.kurszlaukis@debeersgroup Wayne Barnett Venetia Mine, …
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WhatsApp: +86 18221755073The Voorspoed kimberlite is an aegirine and sanidine bearing kimberlite and along with the geochemistry shows a more evolved composition relative to the Lace kimberlite.
WhatsApp: +86 18221755073The Finsch diamond mine is located 165km west of Kimberley in the Northern Cape province of South Africa. A semi-automated Tamrock production drill rig is used in the drill rigs and blasting areas. Each LHD in …
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WhatsApp: +86 18221755073Over thousands of years, eroded kimberlite carries rough diamonds downstream and enriches in the middle and lower reaches of the river, seashore and the offshore continental, form alluvial diamond deposit. The first …
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WhatsApp: +86 18221755073Monastery kimberlite in South Africa (Moore and Gurney . 1989) and in Sloan kimberlite (Colorado-W yoming, US A) (Otter and Gurney 1989). REE patterns for the Lace zir-
WhatsApp: +86 18221755073Province. Kimberlite and orangeite whole-rock major and trace element compositions are similar to other South African localities. Compositionally, the aillikites typically lie off kimberlite and orangeite trends. Groundmass mineral chemistry of the kimberlites has some features more typical of orangeites. Kimberlite whole-rock Sr and Nd isotopes
WhatsApp: +86 18221755073One of the most famous kimberlite pipes is the Premier kimberlite that plays host to the Cullinan diamond mine. Premier is located within the Archean Kaapvaal craton of South Africa (Fig. 1). At 32 ha (0.32 km 2) in size at the surface, it is the largest kimberlite pipe by area in South Africa (Bartlett, 1994).
WhatsApp: +86 18221755073constraining the primary kimberlite magma compositions and (3) through quantitative modelling, placing constraints on the composition, compositional evolution and location of their mantle source regions. Geological setting and sampling The Swartruggens and Star kimberlite dyke swarms are located on the Kaapvaal craton (Fig. 1), South Africa, each
WhatsApp: +86 18221755073Rb–Sr age determinations on South African kimberlite pipes. Physics and Chemistry of the Earth 9, 605–617. Barrett, D. R. & Berg, G. W. (1975). Complementary petrographic and strontium-isotope ratio studies of South African kimberlite. Physics and Chemistry of the Earth 9, 619–635.
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