 | | Journal (article/letter/editorial) | | Mineral inclusions in diamonds from the River Ranch kimberlite, Zimbabwe Received: 11 January 1995 / Accepted:...diamonds from the River Ranch pipe in the Late Archean Limpopo Mobile Belt (Zimbabwe), are phases of harzburgitic...chemistry demonstrates a limited overlap with River Ranch kimberlite macrocrysts: the DI garnets are more...DI spinel and garnet are more Mg-rich. Most River Ranch diamond inclusions were equilibrated at T = 1080Ā±...inclusions from all other kimberlites studied, the River Ranch DI have a lithospheric aĀnity and therefore indicate |  | | Journal (article/letter/editorial) | | 00+0.00 A REVIEW OF THE MINERALS INDUSTRY IN ZIMBABWE T. J. VEASEY School of Chemical Engineering,...of the potential for the minerals industry in Zimbabwe. Some aspects of social and political factors...HISTORICAL BACKGROUND The minerals industry in Zimbabwe has its origins in ancient times and workings...the country - - the spectacular ruins of Great Zimbabwe. The ruins are a labyrinth of stone walls, fabricated...the fourteenth century the population of Great Zimbabwe probably exceeded ten thousand [1], with an economy |  | | Journal (article/letter/editorial) | | Southdale, 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers...Following the discovery of diamonds in river deposits in central South Africa in the mid nineteenth century...discovered in South Africa and Botswana in particular, but also in Lesotho, Swaziland and Zimbabwe. A century...small and marginal, such as the Frank Smith Mine in South Africa. They include large diatremes such as...with the discovery of the older diamond mines in South Africa such as Kofļ¬efontein, Jagersfontein and the |  | | Journal (article/letter/editorial) | | about the same time, experimental studies of the graphiteādiamond transition have established the temperature-depth...keels which extend SC R below the depth of the graphiteādiamond transition are likely to be diamond-rich;...any kimberlite pipes in this area Kaapvaal and Zimbabwe cratons (3.2-3.7 Ga). Lithosphere mantle density...preserved Kaapvaal mantle. CE P In most of the Zimbabwe craton (2.8-3.7 Ga), in particular in the eastern...to the AC Kaapvaal craton. The Great dyke of Zimbabwe seems to mark the eastern edge of the most depleted |  | | Journal (article/letter/editorial) | | Boyd, 1987), which roughly parallels the diamondā graphite stability curve. This procedure may underestimate...generalised as a line parallel to the diamond ā graphite stability curve. Model conductive geotherms of...(Fig. 1) is made up of the Archean Kaapvaal and Zimbabwe cratons, separated by the Limpopo Belt. It is...break-up of Gondwana (Brandl and de Wit, 1997). 3.1. Zimbabwe Craton Kusky (1998) recognised two main structural...contrasts in deformational style with the Kaapvaal and Zimbabwe Cratons and appears to be an ancient microcontinent |  | | Journal (article/letter/editorial) | | Earth mantle. The study of diamonds from the Mwadui Mine has the scope to provide data on the state of the...Africa (Dawson 1992). The Mwadui Mine (formerly known as Williamson Mine) in Western Tanzania is the largest...1977; Raber 1978; Shee 1980 unpublished). The Mwadui Mine preserves crater facies, including lake beds, a...representative mineral inclusions. Eight diamonds with graphite coated rosette shaped fracture systems did not...low CaO region found for example, at the Finsch Mine diamonds (Harris and Gurney 1979). In general major |  | | Journal (article/letter/editorial) | | were obtained from alluvial mines along the Orange River close to Oranjemund, as well as from all the alluvial...McDade and Harris, 1999) and the Limpopo belt (River Ranch, Olivine (22 inclusions from 21 diamonds) also...surface heat flow of 38 ā 42 mW/m2. The diamond ā graphite transition is from Kennedy and Kennedy (1976)...the intersection of the local geotherm with the graphite ā diamond transition. However, because equilibrium...in diamonds from Finsch and Premier kimberlite, South Africa. Geochim. Cosmochim. Acta 48 (2), 325 ā 342 |  | | Report (issue) | | Windhoek* Gaborone * Pretoria * Mbabane REPUBLIC OF SOUTH AFRIC1' \ Maputo * LESOTHO MAURITIUS (J Port...137 Sierra Leone . . . . . . . . . . . . . 141 South Africa . . . . . . . . . . . . . 145 Sudan . . ...195 Zambia . . . . . . . . . . . . . . . . 203 Zimbabwe . . . . . . . . . . . . . . . 213 Other Countries...of diversified experience in mineral exploration, mine design, development, and operations, as well as...and the Middle East, especially Iraq, Namibia, South Africa, and Zaire. Hendrik G. van Oss is an economic |  | | Journal (article/letter/editorial) | | in cumulative centers under PāT conditions of graphite stability if they are soluble in kimberlitic melts...dissolution and recrystallization of diamond into graphite. Most likely, the time factor does not limit the...Navon, 1994; Litvin and Zharikov, 2000). Ultrapure graphite (kinetically stable phase under the experimental...(Litvin et al., 2012) and does not depend on the graphite content in the initial composition of the system...is procedurally feasible to select a constant graphite content (40 wt %), which yields a significant |  | | Journal (article/letter/editorial) | | sub-cratonic mantle beneath the Limpopo Mobile Belt (South Africa) Quinten H.A. van der Meer a, b,ā, Martijn...xenoliths from the Venetia kimberlite pipes (533 Ma) in South Africa reveals an apparently stratiļ¬ed cratonic...Mobile Belt (LMB) that separates the Kaapvaal and Zimbabwe Cratons. Combined pressureātemperature (PāT) data...of the Kaapvaal Craton to the south of the LMB but not of the Zimbabwe Craton to the north, implying...northernmost South Africa was emplaced at ~533 Ma (Allsopp et al., 1995) and is one of South Africa's most |  | | Journal (article/letter/editorial) | | Grahamstown, 6140, South Africa. e-mail: andy.moore@info.bw Ā© 2009 March Geological Society of South Africa ABSTRACT...the 3106 Cullinan, recovered from the Premier Mine, South Africa (Williams, 1932), as well as gems like...kindly provided by Debbie Bowen of Letseng Diamond Mine, illustrates a selection of Type IIa stones from...where āflawsā are observed, these are invariably graphite. ā¢ Unlike Type I diamonds, which cleave in steps...the Letseng Type IIa stones do not fluoresce. SOUTH AFRICAN JOURNAL OF GEOLOGY, 2009, VOLUME 112 PAGE |  | | Book | | associated alkalic basaltic rocks from Pishin District, Pakistan.4 Reasons of variations of individual...prognosis and prospering of diamond's host rocks on the south of Siberian platform.38 The petrology and geochemistry...of a polymict xenolith from the Kimberley Area, South Africa......40 Eclogites from the Mir kimberlite...megacrysts from the Lace (Group II) kimberlite, South Africa..........52 Isotope composition of the sub-continental...Southeastern Raipur kimberlitic field, Raipur District, Madhya Pradesh, Central India.106 Experimental |  | | Journal (article/letter/editorial) | | Dept. of Geology, Rhodes University, Grahamstown, South Africa. African Queen Mines Ltd., Box 66 Maun Botswana...bots@gmail.com Ā© 2014 December Geological Society of South Africa ABSTRACT Type II (N-poor) diamonds do not...reduced mantle wall rocks. Visually identified graphite inclusions, often rounded and thus inferred to...conditions of crystallization of megacrysts across the graphite-diamond inversion curve, and thus within the lithosphere...recovered from an Indian alluvial source, and now SOUTH AFRICAN JOURNAL OF GEOLOGY, 2014, VOLUME 117.2 PAGE |  | Smit, K.V., Shirey, S.B., Richardson, S.H., le Roex, A.P., Gurney, J.J. (2010) ReāOs isotopic composition of peridotitic sulphide inclusions in diamonds from Ellendale, Australia: Age constraints on Kimberley cratonic lithosphere. Geochimica et Cosmochimica Acta, 74 (11) 3292-3306 doi:10.1016/j.gca.2010.03.001 | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch 7701, South Africa Department of Terrestrial Magnetism, Carnegie...Ellendale lamproites intrude the King Leopold Orogen, south of the Kimberley craton. The sulphide inclusions...Viljoen, 2002); Venetia, River Ranch emplaced into the Limpopo Belt between the Zimbabwe and Kaapvaal cratons...province) intrude into the King Leopold Orogen to the south of the Kimberley craton. The Argyle lamproite (East...craton (Plumb, 1979) and is bounded to the east and south by the intracratonic Halls Creek and King Leopold |  | | Book | | Verlag, photographs 2; 4. Geological Society of South Africa, photographs on ps 62; 193; 217. Harry N...Seychelles Sierra Leone Socotra (Yemen) Somalia South Africa Sudan Swaziland Tanzania Togo Tunisia Uganda...Sahara (under Moroccan administration) Zambia Zimbabwe 142 146 148 152 156 160 162 168 172 176 180 186...Principe, Sierra Leone, Somalia, Sudan, Uganda and Zimbabwe. Negative economic impacts that resulted from...also felt by Angola, Namibia, Rwanda, Uganda and Zimbabwe. The long-term implication of the AIDS epidemic |  | | Journal (issue) | | October 1998 ISSN: 1355-4565 Blue euclase from Zimbabweāa review Susan Stocklmayer (nĆ©e Anderson), FGS...ABSTRACT: Blue euclase from Mwame, Hurungwe District, Zimbabwe, which was first collected in the late 1970s...photomicrographs. Keywords: euclase, inclusions, pegmatite, Zimbabwe Euclase in Africa Introduction 174 uclase...from sources in Colombia, Russia, Tanzania and Zimbabwe; spectacular crystals have been described from...the gemmological interest in the crystals from Zimbabwe is for the deep azure colour. Tanzania Spencer |  | | Journal (issue) | | Natural-Color Blue Diamonds Black Diamonds from Zimbabwe Characterization of Yogo Sapphires Synthetic Diamonds...Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions Karen V. Smit...Viljoen Paris, France Wuhan, China Johannesburg, South Africa Gaston Giuliani Thomas M. Moses Wuyi Wang...combination of tiny, methane-associated graphite inclusions, graphite needles, and brown radiation stains...specific locationsāthe Cullinan mine in South Africa and the Argyle mine in Australia. Although blue color |  | | Journal (issue) | | An electric current is passed through a central graphite rod surrounded by the mixture to heat it internally...form diamond and the hexagonal form lonsdaleite (graphite and chaoite are not polytypes but only polymorphs)...gaseous cracking, also called pyrolytic Porous Graphite decomposition or the Van Arkel' process, various...containing a hollow cavity. This was heated in a sealed graphite crucible to 2500Ā°C when crystals grew inside the...4: The growth configuration described inporous graphite tube to line the cavity, as well the Davis, Carter |  | | Journal (issue) | | and Burke, E.AJ., 1998. Emeralds from Sandawana, Zimbabwe: the use of Raman microspectroscopy in identification...other countries (e.g. Brazil, Russia, Zambia, Zimbabwe-Sandawana, Afghanistan and India) crystalline...Eleven single crystals from Heffernan's mine, Torrington, New South Wales, Australia, five from Arac,uai...Locality Sample numbers Australia: Heffernan's mine, Torrington, NSW Size Colour Morphology 1-11...a representative beryl crystal from Heffernan's mine, and Figures 2a, b and c are DICM photographs at |  | | Journal (article/letter/editorial) | | use . . . . . . . . . . . . . . . . . . . . . Graphite . . . . . . . . . . . . . . . . . . . . . . ....mineralogy of graphite. . . . . . . . . . . . . . . 50.2. Magmatic deposits of graphite . . . . . . ....Structure-bound graphite deposits . . . . . . . . . . . . . . . . 50.4. Sedimentary graphite deposits . ...50.5. Metamorphic graphite deposits . . . . . . . . . . . . . . . . . . 50.6. Graphite supply and use ...Goethite Gold native Goldļ¬eldite Gorceixite Goyazite Graphite Gratonite Greenalite Greenockite Gregoryite Greigite | | | Journal (article/letter/editorial) | | use . . . . . . . . . . . . . . . . . . . . . Graphite . . . . . . . . . . . . . . . . . . . . . . ....mineralogy of graphite. . . . . . . . . . . . . . . 50.2. Magmatic deposits of graphite . . . . . . ....Structure-bound graphite deposits . . . . . . . . . . . . . . . . 50.4. Sedimentary graphite deposits . ...50.5. Metamorphic graphite deposits . . . . . . . . . . . . . . . . . . 50.6. Graphite supply and use ...Goethite Gold native Goldļ¬eldite Gorceixite Goyazite Graphite Gratonite Greenalite Greenockite Gregoryite Greigite |  | Jaques, A. L., O'Neill, H. St. C., Smith, C. B., Moon, J., Chappell, B. W. (1990) Diamondiferous peridotite xenoliths from the Argyle (AK1) lamproite pipe, Western Australia. Contributions to Mineralogy and Petrology, 104 (3) 255-276 doi:10.1007/bf00321484 | Journal (article/letter/editorial) | | USA (McCallum and Eggler /976), 2 from Finsch in South Africa (Shee et al. 1982) and the remainder from...the SW side of Lake Argyle on the Ord River some 200 km south of the town o f K u n u n u r r a (lat...production from pipe concentrates and contain tiny graphite inclusions; no other mineral inclusion species...diopside inclusions in diamonds from the Koffiefontein mine. 260 Garnet As no primary garnet remains in any...from the Jagersfontein and Bultfontein kimberlite, South Africa (Haggerty 1983; Erlank etal. 1987) suggesting |  | | Journal (issue) | | Ch'unch'on). Annual production of the nephrite mine (the Daeil Mine) is reported to be approximately 80 000-90...map of nephrite mine area, Chuncheon, Korea. Occurrences The geology of the nephrite mine area consists...1995,24, 8 549 Fig. 3. Mine workers remove nephrite ore at the Daeil Mine, Chuncheon, Korea. The nephrite...Acknowledgements I thank the Daeil Mine for allowing access to the mine. Thanks are also due to S.E. Lee...1935b). Kabaing (Khabine), at Kin, is located a mine famous for star sapphires (see Figure 1). The sapphires |  | | Report (issue) | | stone hammers, and called his claim the Stone Hammer mine. This find aroused so much interest that the San...circumstance the location was named the Stone Hammer mine. "The State Slining Bureau reported at about the...region between Death Valley and Goff's Mining District, nearer the former, and that good samples were...the museum of the Bureau. * * * "The turquoise district, as described by Mr. Eisen and others of the party...AND GEOLOGICAL SKETCHES 1956] 15 the west or south, a strange tribe searching for precious stones among |  | Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Seryotkin, Y.V., Yefimova, E.S., Floss, C., Taylor, L.A. (2004) Mineral inclusions in microdiamonds and macrodiamonds from kimberlites of Yakutia: a comparative study. Lithos, 77 (1) 225-242 doi:10.1016/j.lithos.2004.04.001 | Journal (article/letter/editorial) | | Krasnopresnenskaya mines; Daldyn (4), Udachnaya mine. All other fields include mostly barren and low...Microdiamonds with mineral inclusions from Komsomolskaya mine. Symbols for mineral inclusions: pyrope (Prp), olivine...polymineralic inclusions in microdiamonds from Udachnaya mine exposed at the polished surface of microdiamond...performed with a Stoe 229 STADI-4 diffractometer (graphite-monochromated MoKa radiation; scintillation counter)...chromite inclusions from Yakutian (fields 1 and 2) and South African (field 3) macrodiamonds (Griffin et al. |
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