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jun 13, 2019· the venetia diamond mine, located 80km from musina in limpopo province of south africa, had more than 924mct of diamond reserves as of december 2018 venetia is the biggest diamond producing mine in south africa it produced 42mct of diamonds in 2018 the deposit comprises 12 kimberlite
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semi-quantitative modelling of kimberlite genesis and source geochemistry is used to evaluate mantle source region characteristics and evolutionary processes, as a basis for the development of an integrated model describing the petrogenesis of south african group i and group ii mesozoic kimberlites.
kimberlite pipe in venetia mine, south africa, which suggests that some pipes or sub-components of pipes… the ratio is used to proportionally reduce. unlike other crushing and milling processes ( kelly and spottiswood 1990).
new kimberlite discovered. botswana diamonds has reported the discovery of a new kimberlite “blow” located on its thorny river project in south africa. the blow was discovered during recent drilling programme and covers a target area of 0.4 ha. john teeling, chairman, comments. “this is significant as the nearby marsfontein and sugarbird
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kimberlite, also called blue ground, a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains diamonds in its rock matrix. it has a porphyritic texture, with large, often rounded crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass). it is a mica peridotite, and its most abundant mineral constituent is olivine.
the uintjiesberg kimberlite pipe, situated in the northern cape province, south africa, is located about 60 km from the southwestern boundary of the kaapvaal craton .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 emplaced at 80–114 ma (smith, 1983).
the oaks mine, marnitz kimberlite cluster, swartwater, capricorn district, limpopo, south africa : an open pit diamond mine in a small kimberlite pipe, owned by de beers. the pipe was discovered in 1988 and mined since 1999. the estimated mine life was only 8 years, to a final pit depth of 200 m.
the mothae mine is a kimberlite diamond mine located in lesotho, africa. it is owned by lucapa diamond company (70%) in partnership with the government of the kingdom of lesotho (30%). discovered by basutoland diamonds in 1961, the mine is a source of large and premium-value diamonds such as the rare type iia whites and coloured gems.
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.
fresh samples of hypabyssal kimberlite from the five major kimberlite pipes in the kimberley area of south africa have been analysed for their bulk-rock major and trace element geochemistry. the geochemical data allow identification of the influence of crustal contamination in certain samples, best illustrated in terms of elevated sio 2 , al 2
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
kimberlite pipes: how they form. as mentioned, kimberlite pipes are believed to have been formed by deep-source volcanic eruptions. jeffrey
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