 | | Journal (article/letter/editorial) | | of Saint Petersburg, Russia c Catoca Geological-Mining Community, Angola Ac ce p te d M an us cr...age of upper mantle eclogite xenoliths from the Catoca and Cat-115 (Kasai Craton) pipes are presented...ratios. an The Nb/Ta and Nb/La ratios in the Catoca eclogites range from chondritic to superchondritic...and forming inclusions in diamonds. Because the Catoca kimberlite pipe is one of the richest diamond-bearing...on eclogite xenoliths from the Catoca and CAT-115 (Kasai Craton, Angola) kimberlite pipes, which are common |  | Campeny, Marc, Kamenetsky, Vadim S., Melgarejo, Joan C., Mangas, José, Manuel, José, Alfonso, Pura, Kamenetsky, Maya B., Bambi, Aurora C.J.M., Gonçalves, Antonio O. (2015) Carbonatitic lavas in Catanda (Kwanza Sul, Angola): Mineralogical and geochemical constraints on the parental melt. Lithos, 232. 1-11 doi:10.1016/j.lithos.2015.06.016 | Journal (article/letter/editorial) | | Carbonatitic lavas in Catanda (Kwanza Sul, Angola): Mineralogical and geochemical constraints on...Antonio O., Carbonatitic lavas in Catanda (Kwanza Sul, Angola): Mineralogical and geochemical constraints on...MANUSCRIPT Carbonatitic lavas in Catanda (Kwanza Sul, Angola): mineralogical and geochemical constraints on...Geologia, Universidade Agostinho Neto, Luanda, Angola. Pura Alfonso, Dept. Enginyeria Minera i Recursos...Luanda, Angola. Antonio O. Gonçalves, Depto. Geologia, Universidade Agostinho Neto, Luanda, Angola. Abstract |  | Vasiliev, E. A., Petrovsky, V. A., Kozlov, A. V., Antonov, A. V. (2018) Infrared Spectroscopy and Internal Structure of Diamonds from the Ichetyu Placer, Central Timan, Russia. Geology of Ore Deposits, 60 (7) 616-624 doi:10.1134/s1075701518070073 | Journal (article/letter/editorial) | | Urals, Brazil, and the northern Yakutia diamond province has been identified in diamond crystals of the...example, at deposits in the Arkhangelsk diamond province, their share reaches as high as 60%, but up to...spectrum with 405 nm laser excitation. Inclusions of forsterite and chromite with diamond facing are present...CL image. These boundaries are marked by many forsterite inclusions a few microns in size. Irregularly...which were determined by Raman spectroscopy as forsterite. Sample no. 44. The internal structure of the |  | | Journal (article/letter/editorial) | | northeastern Angola, which hosts most of the kimberlites of the Congo Craton including Catoca, the world's...alluvial diamonds of the Kasai River, Katanga Province, Democratic Republic of the Congo (DRC), whose...of the cratonic mantle underpinning northeastern Angola. In the fifth paper of the category, Rudloff-Grund...describe a unique peridotitic paragenesis (rutile + forsterite + enstatite + Cr-diopside + Cr-pyrope) preserved |  | Ashchepkov, I. V., Alymova, N. V., Logvinova, A. M., Vladykin, N. V., Kuligin, S. S., Mityukhin, S. I., Downes, H., Stegnitsky, Yu. B., Prokopiev, S. A., Salikhov, R. F., Palessky, V. S., Khmel'nikova, O. S. (2014) Picroilmenites in Yakutian kimberlites: variations and genetic models. Solid Earth, 5 (2). 915-938 doi:10.5194/se-5-915-2014 | Journal (article/letter/editorial) | | compositions from different regions Yakutian kimberlite province (Daldyn, Alakit and Malo-Botuobinsky fields)....monomineralic formulation takes into account the forsterite content Esk = Cr/2 (esklaite); (Fo = 1 − Fe#Ol)...from different regions within Yakutian kimberlite province (Nakyn, Upper Muna and Anabar fields). 1. Ilmenites...the Mg-rich and Fe-rich varieties, for example in Angola (Robles-Cruz et al., 2009; Ashchepkov et al., 2012)...ilmenite-bearing association form kimberlites of Yakutian province, Ph.D. dissertation thesis, Irkutsk, Institute |  | | Journal (issue) | | Colorless forsterite from Myanmar and Tajikistan • “Jambolite” • Update on the John Saul ruby mine, Kenya...DeGhionno D.G., Koivula J.I. (1996) Opal from Shewa Province, Ethiopia. Gems & Gemology, Vol. 32, No. 2, pp...Muzo region, which encompasses not only the Muzo mine but also the La Pita, Figure 1. In the six upper...There is also confusion relating to “old mine” emeralds. Old mine is another term applied to rare and fine...inspire the owner or seller to call the stone “old mine.” Conversations with Colombian emerald dealers and |  | | Journal (article/letter/editorial) | | central part of the Arkhangelsk diamondiferous 16 province (ADP). Based on the concentrations of Cr2O3, CaO...mantle beneath the Arkhangelsk diamondiferous province (ADP) is one 71 of the most poorly characterized...setting and samples The Arkhangelsk diamondiferous province (ADP) is located in the northern part of the ...beneath kimberlite pipes from the 491 Catoca cluster, Angola. Tectonophysics 530–531, 128–151 492 ...Posuhova T.V., 1999. Arkhangelsk diamondiferous 500 province. Moscow State University, 521p (in Russian). |  | | Journal (issue) | | marketed, and merchandized. In diamonds especially, the mine-to-market process has been severely tested. Vertical...southern Africa (Botswana, South Africa, Namibia, Angola, and Zaire), and Russia (mainly in the Republic...reference to the country rather than to the specific mine or region. For more on the specific localities,...produce attractive emeralds. Zimbabwe’s Sandawana mine is noted for small stones (0.05 to 1 ct) of high...far there has been only limited production from mine dumps (N. Kuznetsov, pers. comm., 2000). The most |  | Bataleva, Y.V., Palyanov, Y.N., Sokol, A.G., Borzdov, Y.M., Palyanova, G.A. (2012) Conditions for the origin of oxidized carbonate-silicate melts: Implications for mantle metasomatism and diamond formation. Lithos, 128. 113-125 doi:10.1016/j.lithos.2011.10.010 | Journal (article/letter/editorial) | | CO2 and zircon + 2 magnesite = baddeleyite + forsterite + 2 CO2. American Mineralogist 87, 1342–1350...Newton, R.C., Sharp, W.E., 1975. Stability of forsterite+CO2 and its bearing on the role of CO2 in the...compositions and textures of ilmenite in the Catoca kimberlite, Angola, and implications in exploration for diamond |  | | Journal (issue) | | from India • Emerald mining techniques at the Kagem mine, Zambia • Yellow grossular from Tanzania • An unusual...studies of retail colored stone demand, to provide a mine-to-market analysis of corundum over the last quarter...or difficult to interpret, even when coming from mine owners or official government sources. For example...Pakistani side of Kashmir (Kane, 1997, 1998). The mine, situated in extremely remote and rugged mountainous...g (85 ct; Kane, 1997, 1998). It is believed the mine was still operat- GEMS & GEMOLOGY WINTER 2009 |  | | Journal (issue) | | made it possible to recover diamonds from the Ekati mine, in the bitter cold of Canada’s Northwest Territories...diamond reserves, and future potential. The new Ekati mine in Canada’s frigid Northwest Territories, Namdeb’s...the mining companies to develop and economically mine increasingly hard-to-access diamonds. Technology...diamond (995.20 cts) ever found at the Jagersfontein mine. The bracelet was on view in the Nature of Diamonds...in volume significantly less than 1% of “run of mine” diamonds. After processing, most of the diamonds |  | | Journal (article/letter/editorial) | | 80 Note: W, Wesselton Mine; RSA; R, Roberts Victor Mine, RSA; L, Louwrencia Mine, Namibia. experiment...Diamond Ridge Temperature (°C) Alss(Opx) Grey Eagle Mine Alss(Opx) Del Puerto Canyon 1000 Alss(Cpx) Burro...Alss(Cpx) Black Diamond Ridge Alss(Cpx) Grey Eagle Mine Alss(Cpx) Del Puerto Canyon 800 Crss(Cpx) Burro...University] at 08:41 30 May 2015 Crss(Cpx) Grey Eagle Mine 0 800 900 1000 1100 Temperature (°C): LnKd...Diamond Ridge 1.2 T = LnKdCrss Cpx: Grey Eagle Mine T = LnKdCrss Cpx: Del Puerto Canyon 1.0 T = LnKdAlss |  | Nikolenko, Evgeny I., Lobov, Konstantin V., Agashev, Alexey M., Tychkov, Nikolay S., Chervyakovskaya, Maria V., Sharygin, Igor S., Nikolenko, Anna M. (2020) 40Ar/39Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia) Minerals, 10 (10) 886 doi:10.3390/min10100886 | Journal (article/letter/editorial) | | diamond-bearing lamprophyres from Wawa Superior Province, Canada [7]. Usually, occurrences of K-alkaline...emplacement [8,9]. The rocks of Aldan alkaline province of Mesozoic magmatism, which formed in the ancient...manifestations of alkaline magmatism in the Aldan province of the Siberian craton (Yakutia, Russia), which...formed crustal block [32,33]. Within the Aldan province, multiple alkaline magmatic events occurred in...lamproites, group II kamafugites and group III Roman Province, based on [85] (b); Field for Central Aldan lamproites |  | | Book | | of the eastern margin of the Atlantic (Namibia, Angola) or the western African kimberlites do not fulfil...individual chapters: i) the carbonatitic-alkaline province outcropping on the Kenya-Uganda border which have...Petrogenesis of the volcanic rocks of the Karoo Province edited by ERLANK (1984). In addition, a review...review paper related to this volcanic province appeared in the book devoted to the Flood Basalts Provinces...138 139 142 146 146 5 The Mesozoic Tholeiitic Province of Northwest Africa: A Volcanotectonic Record |  | Faithfull, John W., , , Dempster, Tim J., MacDonald, John M., Reilly, Monica (2018) Metasomatism and the crystallization of zircon megacrysts in Archaean peridotites from the Lewisian complex, NW Scotland. Contributions to Mineralogy and Petrology, 173 (12) doi:10.1007/s00410-018-1527-5 | Journal (article/letter/editorial) | | ultramafic host. The system is dominated by a forsterite breakdown reaction to produce orthopyroxene at...Scourie dyke swarm: A long-lived large igneous province with implications for the Paleoproterozoic evolution...anthophyllite—magnesite assemblages from the Grenville province. Canad Mineral 35:122 l-1236 Friend CRL, Kinny...SHRIMP geochronology of zircon from the Catoca kimberlites, Angola: implications for diamond exploration |  | | Book | | following system, forsterite (Fo) — and only two solid phases, garnet and forsterite, now remain in the...is the lowest melting point of the components forsterite, diopside and pyrope. At a eutectic, such as...composition of the liquid heads directly towards forsterite which is now the only remaining solid phase;...less dense. For example, the Mg-rich olivine, forsterite, has a density of 3200 kg/m*, whereas the density...chamber once existed beneath the Tharsis volcanic province. Some petrologists be- (1979: partly lieve that |  | | Book | | discovered kimberlites of the Siberian kimberlite province. 9 K - rich clinopyroxenes as mantle conveyers...and kamafugites from the Alto Paranaiba Igneous Province, Minas Gerais, Brazil: Preliminary studies. 26...diamond. 61 Cr-poor Megacrysts from the Frank Smith Mine and the source regions of transitional kimberlites...Facies Kimberlite Bodies of the Fort £ la Come Province, Saskatchewan, Canada. 103 Kimberlites, accelerated...Mantle Formation The Buffalo Hills Kimberlite Province, North-central Alberta, Canada. Eclogitic, Peridotitic |  | | Journal (volume) | | .........................319 EM61 Mineralogy of mine wastes and contaminated soil......................and phases composition of flotation waste of Bor mine (Serbia) Cocić, M.1, Matović, B.2 & Logar, M.3*...pezzottaite from Myanmar Emeralds from the Piteiras mine, Minas Gerais State, Brazil: genetic implications...Nancy I, Vandoeuvre-le`sNancy, France The Piteiras mine in Itabira is located in the Minas Gerais State...Temperature (oC) Koffiefontein mine 1087 (±15) 5.2 (±0.1) Finsch mine 1041 (±5) 5.0 (±0.1) The structural |  | | Book (volume) | | Kimberlite Magmatism in the Yakutian Kimberlite Province: Constraints from Isotope Geochronology—An Overview...5 Pseudomorphic serpophite 15 -0.5 Wesselton Mine (South Africa) Segregation serpophite 6 -1.3...-0.1 Segregation serpophite 17 0.1 Wesselton Mine (South Africa) Segregation serpophite 18 -0.5...(2009) Tuffisitic kimberlites from the Wesselton Mine, South Africa: Mineralogical characteristics relevant...petrogenesis of the Wesselton Mine kimberlite, Kimberley, Cape Province, R.S.A. Ph.D. Thesis, University |  | | Book | | reasons for the approach taken Mineral deposit or mine? A genetic model as the basis for exploration The...many geologists who have given their time during mine visits and responded to our queries. We have benefited...strong affinity for sulphur, characterized by the sul;>hide ore minerals. China clay A commercial product...Decline Doline A downward inclined tunnel into a mine or potential ore body. A funnel-shaped depression...shaft excavated upwards for connecting levels in a mine or ore body. Ripping The removal of overburden |  | | Report (issue) | | right to file claims that permit the claimants to mine and sell minerals found. The Mining Law does not... 6 TABLE 1.-U.S. MINERAL INDUSTRY TRENDS Total mine production: 1 Metals Industrial minerals Coal Employment:...South Africa; the end of longstanding civil wars in Angola and Mozambique; privatization trends in Zambia...development was centered in southern Africa. In Angola, the developments in the petroleum and diamond...foreign investment, two new diamond projects, Luo and Catoca, came into production. Total diamond production |  | | Report (volume) | | ophiolite-hosted Code Locality Canada C1 Jeffrey Mine, Quebec Carbides* 15 Type** Associated Phases***...R1 Khungtukun Massif, Khatanga, Siberia R2 Coal Mine 45, Kopeisk, Urals R3 Is River, Isovsky District...Pb, Sn, Zn Dia Jed, Ru South Africa S1 Monastery Mine, Free State Prov. M Kim Dia, Maj Tajikistan...N-Cu-PGE Deposit, Sichuan Province; and (4) at Liu Village, Henan Province. These deposits incorporate...α = 46.1°; Z = 2). Calcite crystal from Elmwood Mine, Carthage, Tennessee. Photo courtesy of Rob Lavinsky |
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