Petrology of the hypabyssal kimberlite of the Kroonstad …
The Voorspoed kimberlite is an aegirine and sanidine bearing kimberlite and along with the geochemistry shows a more evolved composition relative to the Lace kimberlite.
The legacy of African kimberlite and diamond research and …
Another major African contribution, by Rory Moore and John Gurney of the University of Cape Town kimberlite research group, was the recognition of garnets with pyroxene solid solution in a diamond recovered from the Monastery kimberlite (South Africa) (Moore and Gurney, 1985; Moore et al., 1991).
Mineral inclusions in Lace diamonds and the mantle …
(Phillips et al. 1998). The Lace kimberlite is a monticellite phlogopite kimberlite with mineralogical and geochemical characteristics more similar to the typical Group I kimber-lites (Howarth et al. 2011). The Voorspoed kimberlite is an aegirine- and sanidine-bearing kimberlite with a more evolved composition relative to the Lace kimberlite (How-
A Review of the Geology of Global Diamond Mines and …
The 32 ha Tier 1 Cullinan (South Africa) diamond mine is another kimberlite twin pipe, with multiple discrete kimberlite phases. The geology of Cullinan mine is described by Wagner (1914), Bartlett (1998), Field et al. (2008) and de Wit et al. (2016). Other excellent examples of steep-walled kimberlite diatremes would have to include the five ...
Mineral inclusions in Lace diamonds and the mantle beneath …
Zircon is a very rare inclusion in diamond (e.g., Kinny and Meyer 1994); as it has only been identified in a placer diamond from central Brazil (Meyer and Svisero 1975), in the Mbuji-Mayi kimberlite in DRC (Ntanda et al. 1982), in Monastery kimberlite in South Africa (Moore and Gurney 1989) and in Sloan kimberlite (Colorado-Wyoming, USA) …
"Kimberlite" and the Source of the Diamond in South Africa
THE origin of the volcanic pipes of South Africa and the genesis of the diamonds contained in their "blue-ground" filling are as productive of controversy as that other geological puzzle—the ...
Re-healing cratonic mantle lithosphere after the world's …
The Premier kimberlite intruded the region occupied by the Bushveld intrusion at ∼1150 Ma (Wu et al., 2013) providing unique sampling of the lithospheric mantle that enables further insight into the effect of the BMFC intrusion on the underlying lithospheric mantle.Early Re-Os analyses of Premier peridotites (Carlson et al., 1999; …
Geochemistry of the Uintjiesberg kimberlite, South Africa: …
The 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 …
African Mining and Crushing: contract crushing expert
African Mining and Crushing's working footprint spans from South Africa to Zambia and Sierra Leone but through its board of directors' experience extends even further into Botswana, Namibia, Mozambique, Zimbabwe and the Democratic Republic of Congo. "We understand Africa and we are comfortable operating on the continent," Hughes …
The use of high-resolution airborne magnetic, ASTER and …
Abstract. Airborne magnetic, Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Landsat Thematic Mapper images were used for the detection of detailed exploration targets for kimberlite pipes located around the Kimberley and Boshof regions in the Northern Cape Province of South Africa.
Finsch Diamond Mine, North Cape Province, South Africa
The 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 …
(PDF) CRETACEOUS EROSION IN CENTRAL SOUTH AFRICA: …
An inland scarp-retreat model is proposed for the Cretaceous erosion cycle in central South Africa. Introduction Kimberlite diatremes contain a wealth of information concerning the composition of the mantle and lower crust, in the form of xenoliths and xenocrysts (including diamonds), that have received extensive attention over the years ...
Kimberlite ‣ GEOLOGY HUB
🔷Kimberlites, named after the town of Kimberly, South Africa, where they were first described, are volcanic rocks that originate in Earth's mantle.🔷They are mined exclusively for diamonds. The photo shows the "Big Hole" at Kimberly.🔷The Hole was mined from 1871 to 1914 and reached a depth of 240 m below the surface. Subsequently it …
Petrogenesis of Group I Kimberlites from Kimberley, South Africa
JOURNAL OF PETROLOGY VOLUME 44 NUMBER 12 PAGES 2261±2286 2003 DOI: 10.1093/petrology/egg077 Petrogenesis of Group I Kimberlites from Kimberley, South Africa: Evidence from Bulk-rock Geochemistry DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY OF CAPE TOWN, RONDEBOSCH, 7701, SOUTH AFRICA …
Rift-induced disruption of cratonic keels drives kimberlite …
It is tempting to interpret the bimodal peak in kimberlite lag times—evident in Africa, South America and North America (Fig. 1d and Extended Data Figs. 3d and 5)—to relate to two main phases ...
Map showing the location of kimberlite-hosted diamond …
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 ...
Kimberlite-hosted diamond deposits of southern Africa: A …
The first part of this paper deals with a short history of diamonds and the discovery of kimberlites as important hosts of diamonds. It also deals with the discovery …
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African Mining and Crushing understands how necessary it is to preserve our environment and approach each project with long-term sustainability in mind. We do not only believe site rehabilitation to be necessary but constantly plan and scrutinize every new and existing project in order to minimize the impact that our activities have on the ...
(PDF) Structural overview of selected Group II kimberlite …
The kimberlite dykes generally consist of poorly- to highly macrocrystic, phlogopite-rich, Group II hypabyssal kimberlite with variable proportions of olivine macrocrysts and phenocrysts, and phlogopite macrocrysts and phenocrysts (Campbell, 1975; Skinner, SOUTH AFRICAN JOURNAL OF GEOLOGY 380 GROUP II KIMBERLITE ARRAYS IN …
BlueRock begins kimberlite processing from KV1 pipe in South Africa
BlueRock 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 project area.
Kimberlite Pipes: What They Are and How They're Formed
Kimberlite pipes were first found near Kimberley in South Africa, but since then they have been found on most continents. Of course, as has been noted, not all kimberlite pipes are created equal ...
Petrographic and melt-inclusion constraints on the
Request PDF | Petrographic and melt-inclusion constraints on the petrogenesis of a magmaclast from the Venetia kimberlite cluster, South Africa | Kimberlitic magmaclasts are discrete ovoid ...
THE GEOLOGY AND GEOCHEMISTRY OF THE VENETIA …
The Venetia kimberlite cluster is situated 16 km south of the border between South Africa and Zimbabwe, 50 km from both Messina and the River Ranch kimberlite. It comprises twelve pipe and dyke bodies, numbered roughly according to decreasing size from K1 to K12, and is situated within the central zone of the Limpopo Belt.
Venetia Diamond Mine
After waste stripping to expose the kimberlite, the ore is blasted and loaded into trucks, hauled to a crusher, reduced in size and conveyed to a primary stockpile. Crushed ore is …
Kimberlites: Earth's Diamond Delivery System
Here is one example from the Orion South kimberlite in Saskatchewan, Canada, where several eruption events occurred between 106 and 95 million years ago (Heaman et al., 2004; Kjarsgaard et al., …
ALEX STREKEISEN-Kimberlite-
The Monastery kimberlite (Fig.2) is an elongated diatreme located along a dyke of 1500 m length; the pipe contained five varieties of kimberlite which Whitelock named quarry, breccia, fine-grained, East-end and South vent type. The south type occurred as blind intrusion which is overlain by 15 m of undisturbed Karoo sedimentary rocks.
Waves rippling under continents could explain mysterious
It was a familiar feeling; he had seen the same pattern in South Africa with the ages and locations of kimberlites, diamond-containing volcanic deposits. Those …
14 Southern African Kimberlites and their Xenoliths
Map of kimberlite occurrences in southern Africa to occur in clusters of 4 to 40 pipes, commonly with only the larger or largest in the cluster being an economically viable …
Morphology, Micro-Structure and Chemistry of A
Garnet megacrysts found in the Cretaceous Group II Monteleo kimberlite (Free State province, South Africa) exhibit an unusual flattened and elongated morphology. Internally, the garnets are characterized by abundant kelyphite veins and microcracks, arranged as preferentially orientated microstructural sets. Numerous rod-like sulphide inclusions ...
Kimberlite Crusher South Africa
200461The Uintjiesberg kimberlite pipe, situated in the Northern Cape Province, South Africa, is located about 60 km from the southwestern boundary of the Kaapvaal craton (Fig. 1).It is an off-craton, Group I kimberlite, with a Rb–Sr age of 100 Ma (Smith, 1983).This is a similar age to other Cretaceous Group 1 kimberlites in South Africa