 | | Journal (article/letter/editorial) | | Africa and South America. INTRODUCTION COLUMBITE-TANTALITE was extractedfor centurieswith tin in Malaya...major depositsand especially Messrs.Bradford,A. Burne,Dr. de Neve, Major Farrington,Dr.Ing. Hermann, Messrs...The writer is indebted to Dr. Charles H. Behre,to Dr. RichardH. Jahnsand Dr. KennethBurke who kindly...the standardaccompanyingmineral of all columbite-tantalite deposits that are now beingmined. Earth acidsare..."greisen,"basic alkaline veins, basic pegmatites Columbite-Tantalite:alluvia, granites, granitic pegmatites |  | | Journal (article/letter/editorial) | | from carbonatites and peralkaline igneous rocks. Columbite-group minerals (CGM) account for the majority...Kibara Belt (mainly Rwanda and the DR Congo), around the Kenticha mine (Ethiopia) and in the Alto Ligonha...predominate in the Man Shield (Sierra Leone), the Congo Craton (DR Congo), the Kamativi Belt (Zimbabwe) and the...the Jos Plateau (Nigeria);  Mn-rich columbite-tantalite is typical of the Alto Ligonha Province (Mozambique)...Arabian-Nubian Shield (Egypt, Ethiopia) and the Tantalite Valley pegmatites (southern Namibia) and  Large |  | | Journal (article/letter/editorial) | | albite-spodumene rare-metal pegmatites with tantalite-columbite, microlite, and ixiolite in the Ancient Gneiss...tantaloniobates. They are usually tantalite and/or Ta-rich columbite, but a noticeable, sometimes decisive...Nechalacho; (19) Mt Weld; (20) Kamativi; (21) Manono-Kitotolo; (22) Motzfeldt; (23) Tanbreez; (24) Crevie;...Brockman Pitinga Nechalacho Mt Weld Kamativi Manono-Kitotolo Motzfeldt Tanbreez Crevie Kenticha Three Alloes...component both in the cassiterite placers with columbite (have already been mined out) and in the primary |  | | Journal (article/letter/editorial) | | foordite-thoreaulite + columbite-tantalite + Ta-rich cassiterite. Simpsonite is present in Manono and Maniema pegmatites...Key-words: foordite, thoreaulite, cassiterite, columbite, tantalite, simpsonite, alkali-bearing Nb-Ta minerals...first described from the Manono granitic pegmatite, Democratic Republic of Congo (DRC), formerly Zaire (Buttgenbach...minerals. A mosaic aggregate of cassiterite plus columbite after primary foordite from Lutsiro pegmatite...alkali-bearing Nb-Ta phases are known from the Manono, DRC and Ungursai, Kazakhstan granitic pegmatites |  | Melcher, F., Graupner, T., Sitnikova, M., Henjes-Kunst, F., OberthĂźr, T., Gäbler, H.-E, Bahr, A., Gerdes, A., Brätz, H., Rantitsch, G. (2009) Ein Herkunftsnachweis fĂźr Niob-Tantalerze am Beispiel afrikanischer Selten-Element Pegmatite. Mitteilungen der Ăsterreichischen Mineralogischen Gesellschaft, 155. | Journal (article/letter/editorial) | | conďŹicts, especially in the Democratic Republic of the Congo, is widely discussed. In many African countries...number of minerals, commonly dominated by columbite-tantalite group minerals. In cases, their compositions...are measured in a representative number of columbite-tantalite grains from a given sample. Some elements...Nationalpark in der Demokratischen Republik Kongo (DR Kongo; âDurban Processâ). Die Studie basierte auf...machten sich Rebellengruppen in den Ostprovinzen der DR Kongo zu nutze. Der illegale Abbau und Handel von |  | | Journal (article/letter/editorial) | | these types of deposits are the columbite group minerals (columbite-tantalite), but at some ore deposits significant...niobium and tantalum. The solubility product of columbite-(Mn) from the fluid-melt interaction experiment...the solubility of columbite-(Mn) follows Henryâs Law. Results show that columbite-(Mn) saturation can...in rare-metal pegmatites. Magmatic origins for columbite group minerals are well constrained, but hydrothermal... Dajishan, and Yichun. This study shows that columbite-(Mn), lithiophilite, and a Ca-Ta oxide mineral |  | | Journal (article/letter/editorial) | | and igneous complexes and correspond to operating mine sites. This study reveals that structural interpretation...Burundi in the south and the Democratic Republic of Congo (DRC) in the west. The study area covers approximately...exploration. The good correlation between active mine sites, interpreted structures and suggested target...Neoproterozoic overprinting of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda...and Li mineralization of Manono-Kitotolo (Katanga, Democratic Republic of Congo). Ore Geol. Rev., 72, 373-390 |  | | Journal (article/letter/editorial) | | and mineral-chemistry constraints regarding the columbite-group minerals in the Penouta deposit: evidences...XRD, SEM, EMPA and MLA. Mn-rich members of the columbite-group minerals (CGM) are the most common Ta-bearing...textures resulted from the corrosion of columbite and especially tantalite rims are common. The Mn/(Mn+Fe) ratio...replacements of CGM and occur associated with tantalite and cassiterite. Subhedral to anhedral cassiterite...interstitial character. KEYWORDS: Tantalum, Columbite-tantalite, Microlite, Wodginite Introduction New |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, OberthĂźr, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalumâ(niobiumâtin) mineralisation in African pegmatites and rare metal granites: Constraints from TaâNb oxide mineralogy, geochemistry and UâPb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | Ma) 4.1.1. Man Shield (Sierra Leone) NU 4.1.2. Congo Craton (DRC) 4.1.3. Zimbabwe Craton (Zimbabwe) ...Mineralogy NU 5. Mineral chemistry of columbite-tantalite, tapiolite, wodginite and ixiolite in African...provinces MA 5.1. Archean 5.1.1. Man Shield 5.1.2. Congo Craton 5.2. Paleoproterozoic CE P 5.2.1. Birimian...sources 7.2. Compositional variation of columbite-tantalite, tapiolite and wodginite-ixiolite 7.3. Chemical...granites and granitic rare-element IP pegmatites. Columbite-group minerals (CGM) account for the majority |  | Feng, Yonggang, Liang, Ting, Yang, Xiuqing, Zhang, Ze, Wang, Yiqian (2019) Chemical Evolution of Nb-Ta Oxides and Cassiterite in Phosphorus-Rich Albite-Spodumene Pegmatites in the KangxiwaâDahongliutan Pegmatite Field, Western Kunlun Orogen, China. Minerals, 9 (3) 166 doi:10.3390/min9030166 | Journal (article/letter/editorial) | | contents, and trace element concentrations of columbite-group minerals (CGM) and cassiterite from three...magmatic cassiterite); (3) anhedral aggregates; (4) tantalite-(Fe)-ferrowodginite (FeSnTa2 O8 ) intergrowths...evolution. Keywords: albite-spodumene pegmatites; columbite-group minerals; cassiterite; Dahongliutan; chemical...manufacturing high-technology products [1,2] and columbite-group minerals (CGM) with a chemical formula (Fe...significant Nb and Ta can enter cassiterite via a columbite substitution (Fe, Mn)2+ + 2(Nb, Ta)5+ = 3Sn4+ |  | | Book | | these ores . ⢠'fhe handbook has been written by Dr. C. F, Davidson, Chief Geologist of the r\tomic Energy...the important pitchblende deposits of the Belgian Congo and of Canada were developed, estimated annua~ output...will bear the cost of aeroplane freighting when a mine is situated in remote and otherwise inaccessible...in vughs in the pitchblende deposits of Belgian Congo, but the common mode of occurrence of this mineral...be found growing on pitchblende specimens in old mine dumps. The refractory uranium ores The uranium |  | Fosso Tchunte, Periclex Martial, Tchameni, Rigobert, AndrĂŠ-Mayer, Anne-Sylvie, Dakoure, Hilaire Somtebda, Turlin, François, Poujol, Marc, Nomo, Emmanuel Negue, Saha Fouotsa, Alliance Nicaise, Rouer, Olivier (2018) Evidence for Nb-Ta Occurrences in the Syn-Tectonic Pan-African Mayo Salah Leucogranite (Northern Cameroon): Constraints from Nb-Ta Oxide Mineralogy, Geochemistry and U-Pb LA-ICP-MS Geochronology on Columbite and Monazite. Minerals, 8 (5) 188 doi:10.3390/min8050188 | Journal (article/letter/editorial) | | Geochemistry and U-Pb LA-ICP-MS Geochronology on Columbite and Monazite Periclex Martial Fosso Tchunte 1...rare-element-bearing mineral is represented by columbite-group minerals (CGM) and other Nb-Ta-oxides (Nb-rutile...supergroup minerals). The CGM is classified as Mn-columbite, with Ta# and Mn# ratios increasing from core...cleavage planes of muscovite. The U-Pb dating of columbite and monazite of the Mayo Salah leucogranite indicates...mineralization; magmatic fractionation; U-Pb dating of columbite 1. Introduction Rare-element deposits (Li, Be |  | | Journal (article/letter/editorial) | | Mountain Pass mine and the Bear Lodge deposit 67 (United States), or the Mount Weld mine (Australia)...resource, development of 84 an integrated approach to mine value chain optimisation is required on a strategic...on the 95 whole orebody and long-term life-of-mine scale and tactical geometallurgy which relates to...amblygonite (LiAlPO4F), zircon, Nb-Ta oxides (columbite-tantalite and ilmenorutile) and uraninite. The 193...amblygonite/montrebasite, apatite, fluorite, Mn- 227 tantalite, microlite, Ta-cassiterite, ilmenite, monazite |  | Van Daele, J., Hulsbosch, N., Dewaele, S., Boiron, M.-C., Piessens, K., Boyce, A., Muchez, Ph. (2018) Mixing of magmatic-hydrothermal and metamorphic fluids and the origin of peribatholitic Sn vein-type deposits in Rwanda. Ore Geology Reviews, 101. 481-501 doi:10.1016/j.oregeorev.2018.07.020 | Journal (article/letter/editorial) | | located in Central Africa, covering parts of D.R. Congo, Rwanda, Burundi, Uganda and Tanzania. The KAB consists...Rb-Sr whole rock; Lehmann et al., 1994; U-Pb columbite; Brinckmann et al., 2001; Dewaele et al., 2011;...the Ntunga mine in Rwanda (Hulsbosch et al., 2017; Varlamoff, 1969). The pegmatites of the mine sites of...attain a size up to 5 cm * 5 cm * 1 cm. Columbite and tantalite (Coltan Group Minerals, CGM) and cassiterite...can be attributed to earlier crystallization of columbite ([Fe, Mn]Nb2O6). Fluid mixing in the quartz veins |  | | Journal (article/letter/editorial) | | Ruggedized SEM platform allows the application even in a mine-site environment. Mineralogic Mining features four...BSE image image(rutile) of zonednatural tantaliteâcolumbite grains in an ore concentrate from Africa...by arrows. (k) Frame view of an of zoned tantalite-columbite grains in an ore concentrate from Africa...published data from various authors. Tantalite, columbite-(Fe), columbite-(Mn) as well as microlith and tapiolite-(Fe)...sorted in the columbite quadrilateral with tapiolite (FeTa2 O6 ), tantalite (MnTa2 O6 ), columbite-(Fe) (FeNb2 |  | Makutu, Douxdoux Kumakele, Seo, Jung Hun, Lee, Insung, Oh, Jihye, Kang, Pilmo, Ongendangenda, Albert Tienge, Makoka, Frederic Mwanza (2023) Magmatic-Hydrothermal Fluid Processes of the Sn-W Granites in the Maniema Province of the Kibara Belt (KIB), Democratic Republic of Congo. Minerals, 13 (4) 458 doi:10.3390/min13040458 | Journal (article/letter/editorial) | | of the Kibara Belt (KIB), Democratic Republic of Congo Douxdoux Kumakele Makutu 1 , Jung Hun Seo 2, * ...of the Kibara Belt (KIB), Democratic Republic of Congo. Minerals 2023, 13, 458. https:// doi.org/10.3390/min13040458...University, Kinshasa 012, Democratic Republic of the Congo Correspondence: seo28@snu.ac.kr; Tel.: +82-10-4457-4877...provinces in Africa are as follows: 1.1 Man Shield, 1.2 Congo Craton, 1.3 Zimbabwe Craton, 1.4 Kaapvaal Craton;...Kibara Belt (KIB) in the Democratic Republic of the Congo (DRC) contains massive Sn-W and other mineral-bearing |  | Chen, Zhuo, Chen, Jianping, Liu, Tao, Li, Yunfeng, Yin, Qichun, Du, Haishuang (2023) Regional Quantitative Mineral Prospectivity Mapping of W, Sn, and Nb-Ta Based on Integrated Information in Rwanda, Central Africa. Minerals, 13 (2) 189 doi:10.3390/min13020189 | Journal (article/letter/editorial) | | and on the west by the Democratic Republic of the Congo. The country lies 120 km south of the equator, covering...basement [36]) during the subduction between the Congo and Tanzania cratons [43]. The granitic intrusions...Rwanda: First results from deep drilling of a coltan mine in Rwanda and first detailed description of Li minerals...Neoproterozoic overprinting of the cassiterite and columbiteâtantalite bearing pegmatites of the Gatumba area, Rwanda...and Li mineralization of Manono-Kitotolo (Katanga, Democratic Republic of Congo). Ore Geol. Rev. 2016, |  | | Conference Proceedings (Volume) | | Cover photograph: View of the Aitik open pit copper mine in the very north of Sweden. Mining operations started...and Li mineralization of Manono-Kitotolo (Katanga, Democratic Republic of Congo): current state of knowledge...Skarn zonation and fluid evolution in the Groundhog Mine, Central Mining District, New Mexico. Econ Geol...diorite porphyry in the Shinyama area, Kamaishi mine, Japan. Min Geol 28:99â109 Nakano T (1998) Pyroxene...Tungsten-bearing skarns of the Sierra Nevada. I. The Pine Creek mine, California. Econ Geol 77:823â844 Nicolescu S (1996) |  | | Report (issue) | | Madagascar. Photo by Bild & Text Mager Dedicated to Dr. Eugene Edward Foord (1946 - 1998) For his sincere...elbaite crystals with lepidolite from the Golconda Mine in Minas Gerais, Brazil by Eberhard Equit, 1993...circa 1910 view of the old mine portal on the north side of the Himalaya Mine in San Diego County, CA....An 11 cm tall elbaite group from the Pederneira Mine in Minas Gerais, Brazil. The bottom of the group...Graeber Right: this dravite from the Mikhaylovskoye Mine in the Transbaikal Region of Russia is 4.5 cm tall |  | | Journal (issue) | | ScNbO4: Products of Ca-metasomatism of Sc-enriched columbite-(Mn) from NYF pegmatite KoĹžichovice II, Czech...and accessory minerals (in this case study columbite-tantalite group minerals [CGM]), and (3) isotope-geochemical...associated with the mineralization. The detection of tantalite-(Fe) in FI in beryl from the Orlovka massif (Thomas...both localities, up to 2 wt.%. Chemistry of columbite-tantalite group minerals The study of the typochemistry... W (up to 1.6 wt.%), and Sn (up to 14 wt.%). Tantalite-(Mn) is absent in Orlovka since here the late |  | | Book | | considered to be a natural accumulation of useful mine ra l materials that can be profitably extracted...whereas the other one te nds to flow. At the Dunkin mine of the Breckenridge district, Colorado, the Dunkin...after it passed into shale (Fig. 2-4). In the same mine several le nticul a r ore shoots are separated by...between porphyry and sediments, 350-ft level, Jerome mine, Ontario, Canada. Somewhat simplified after W. L...emplaced in andesite bu t not in schist. Auno r Gold Mine, Ont ario, Canada . After B. S. W. BuITa m. "Struct |  | | Book | | The contribution of essentially two chapters from Dr. C. Cuff has considerably enhanced the text as has... K.R. , 1971. Economic geology of the Cleveland Mine, Tasmania. Economic Geology, 66 : 861-878. 41...Greisenization and mineralisation at Anchor tin mine, north-east Tasmania. Transactions Institution of...Ransom, D.M. and Hunt, F.L., 1975. Cleveland tin mine. In: C.L. Knight (Editor), Economic Geology of Australia...Swanson, C O . and Gunning, H.C., 1948. Sullivan Mine. In: Structural Geology of Canadian Ore Deposits |  | | Journal (article/letter/editorial) | | Fergusonite Feroxyhyte Ferrihydrite Ferrocolumbite (columbite-(Fe), niobite) Ferroselite Ferrotantalite Fersmite...hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...you look for a mine look near a mineâ. This includes the imperative âif you look for a mine look for smelting...also for the chrome diopside found at Outukumpu mine, a mineral that is ďŹrst and foremost recognized...According to the Raw Materials Group (Sweden), the world mine production in 2005 stood at 19.3 m t metal content | | | Journal (article/letter/editorial) | | Fergusonite Feroxyhyte Ferrihydrite Ferrocolumbite (columbite-(Fe), niobite) Ferroselite Ferrotantalite Fersmite...hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...you look for a mine look near a mineâ. This includes the imperative âif you look for a mine look for smelting...also for the chrome diopside found at Outukumpu mine, a mineral that is ďŹrst and foremost recognized...According to the Raw Materials Group (Sweden), the world mine production in 2005 stood at 19.3 m t metal content |  | | Book | | much biased by science with too little sense of mine for beauty) will keep his memory and work, alive...mining Pb, Cu and Ag, the metals extracted from the mine helped the people of Goslar to accumulate wealth...4524/5507 a N New Aplite Kreuzberg Pegmatite Weiss Mine Pegmatite Silbergrube Aplite Granite Quartz vein...classification. Sn-W-Ta-Nb Pegmatites (12a D) The Manono-Kitolo deposits is the most wellknown representative...Sn-W-Nb-Ta-Be-Li province along the eastern boundary of the DR Congo with Burundi, Rwanda and Uganda. Further pegmatites |
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