Petra Diamonds - Wikipedia

Petra Diamonds operates four producing diamond mines in South Africa. These are all underground kimberlite pipe mines (Cullinan, Finsch, Koffiefontein and Kimberley Underground). The company also had three smaller Fissure Mines (Helam, Sedibeng and Star), but Sedibeng and Star have recently closed and Helam is being run down for closure.

Category:Kimberley (South Africa) - Wikimedia Commons

Media in category "Kimberley (South Africa)" The following 35 files are in this category, out of 35 total. Big Hole in Kimberley.jpeg 1,704 × 1,278; 340 KB. Big Hole open air museum Kimberley.jpeg 1,444 × 1,024; 189 KB. Bishops Lodge - panoramio.jpg 1,936 × 2,592; 1.76 .

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Mining Diamonds in the Canadian Arctic: The Diavik Mine. Figure 1. The Diavik diamond mine, shown here in February 2015, is located on a small island in Lac de Gras, approximately 300 km northeast of Yellowknife and 220 km south of the Arctic Circle, in a remote region of Canada's Northwest Territories. Photo courtesy of Diavik Diamond Mine.

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Group I kimberlites: on-craton Andriesfontein ADF 1 4 30°57′ 24°36′ 10 5 ol calc, serp, phlog, op-ox, pv, ap, zeol Serpentine calcite kimberlite Goedehoop JJG 4282 4 30°50′ 24°25′ 10 5 ol calc, serp, op-ox, pv, ap Serpentine calcite kimberlite Jagersfontein JJG 2151 5 29°46′

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Kimberlite is an igneous rock that major source of diamonds.Kimberlite is a variety of peridotite.It is rich in mica minerals content and often in form of crystals of phlogopite. Other containt abundant minerals are chrome-diopside, olivine, and chromium- and pyrope-rich garnet.Kimberlite is typically found in pipes – structures with vertical edges that are roughly circular in cross-section.

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Kimberlite. Summary: The discovery of the Kimberley Mines has been described above. The final one of five major mines to be discovered was the Wesselton Mine (previously called the Premier Mine, and not be confused with the Premier Mine (now Cullinan Mine) at Cullinan near Pretoria. Wesselton was discovered in 1891.

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Kimberlite Deposits and Geology Formation of Diamonds

Kimberlite is an ultramafic rock derived from the mantle. Diamonds crystallize in the mantle well below the crust but they are carried up into the crust by the rising kimberlitic magma. Only 1% of kimberlite is economic and these are almost always found in or above Archean cratons. Sub-Sahara in Africa and Russia together produce 80% of the ...

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Mineria Sudafrica | Mining | South Africa

The minerals Act, 1991 was repealed and replaced by the mineral and Petroleum Resources development Act of 2002. This publication for 2004 / 2005 is the 22nd edition that sees a return to its traditional format from the revised edition that carried advertising space. Mining's contribution to gross value added in the South African economy decreased from 7,4 percent in 2003 to 7,1 percent in 2004.

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Underground Mining Methods presents the latest principles and techniques in use today. Reflecting the international and diverse nature of the industry, a series of mining case studies is presented covering the commodity range from iron ore to diamonds extracted by operations located in all corners of the world. Industry experts have contributed 77 chapters.

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Ghaghoo Diamond Mine - Mining Technology | Mining News …

Previously known as Gope mine, Ghaghoo is an underground mining operation mainly focused on extracting diamond ore from the GO25 kimberlite pipe. The mining license for Ghaghoo mine was obtained in January 2011 and construction commenced shortly after. The mine was officially opened in September 2014.

Kimberlite Weathering: Mineralogy and Mechanism

Kimberlite mineralogy, specifically the swelling clay content, was found to play a central role: kimberlite ores containing no swelling clay were not prone to weathering under any of the conditions tested. The cation exchange capacity (CEC) correlates well with the …

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