 | | Journal (article/letter/editorial) | | current Ta production; other Ta-Nb oxides such as tapiolite, wodginite, ixiolite, rutile and pyrochlore-supergroup...(mainly Rwanda and the DR Congo), around the Kenticha mine (Ethiopia) and in the Alto Ligonha Province (Mozambique)...(Mozambique), the Arabian-Nubian Shield (Egypt, Ethiopia) and the Tantalite Valley pegmatites (southern...1992; ÄernĂœ et al., 2005). The provenance of pegmatite magmas remains poorly understood. Based on a study...afïŹliation and rare-element signature of the granite-pegmatite systemsâ. Peraluminous granites and associated |  | KĂŒster, Dirk, Romer, Rolf L., Tolessa, Dandena, Zerihun, Desta, Bheemalingeswara, K., Melcher, Frank, OberthĂŒr, Thomas (2009) The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, UâPb age and Ta mineralization. Mineralium Deposita, 44 (7) 723-750 doi:10.1007/s00126-009-0240-8 | Journal (article/letter/editorial) | | 1007/s00126-009-0240-8 ARTICLE The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, UâPb...Springer-Verlag 2009 Abstract The Kenticha rare-element pegmatite, a globally important tantalite source...source in the Neoproterozoic Adola Belt of southern Ethiopia, is a highly fractionated, huge (2,000 m long...rareelement pegmatite class and belongs to the lithiumâcesiumâ tantalum petrogenetic family. The Kenticha pegmatite...an internal geochemical differentiation of the pegmatite sheet proceeding from the lower zone (K/Rb ~36 |  | Melcher, Frank, Graupner, Torsten, GĂ€bler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, OberthĂŒr, 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) | | Schist Belt (western Zimbabwe) 4.3.3. Orange River Pegmatite Belt (Namibia, South Africa) AC 4.3.3.1. Radiometric...data 4.4.1.2. Mineralogy 4.4.2. Pegmatites of Ethiopia and Somalia 4.4.2.1. Radiometric data 4.4.2.2...5. Mineral chemistry of columbite-tantalite, tapiolite, wodginite and ixiolite in African Ta provinces...3.2. Kamativi Schist Belt 5.3.3. Orange River Pegmatite Belt 5.4. Late Neoproterozoic to early Paleozoic...the Eastern Desert (Egypt) 5.4.2. Pegmatites of Ethiopia and Somalia 5.4.3. Alto-Ligonha Province (Mozambique) |  | | Report (issue) | | ............................................M24 Mine Waste Characteristics ........................................................................M27 Mine Closure ..........................................regional lithium-cesium-tantalum rare-metalbearing pegmatite zoning above a parental granite.................zoned lithium-cesium-tantalum rare-metal-bearing pegmatite..............................................................M21 M13. Bar charts showing global mine production of niobium and tantalum, from 2000 to |  | Graupner, T., Melcher, F., GĂ€bler, H.-E., Sitnikova, M., BrĂ€tz, H., Bahr, A. (2010) Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data. Mineralogical Magazine, 74 (4) 691-713 doi:10.1180/minmag.2010.074.4.691 | Journal (article/letter/editorial) | | during progressive evolution of the melt in a pegmatite body (either Nb ? Ta or Fe ? Mn fractionation...mineral-melt partitioning during crystallization of the pegmatite body and by secondary hydrothermal or weathering...causing addition, loss or redistribution of REE. Pegmatite bodies may contain up to several generations of...provide constraints on the genesis of rare-element pegmatite systems. Furthermore, it may be used as a valuable...external calibration. For CGM, wodginite and tapiolite, 55Mn was used as internal standard; for microlite |  | | Report (issue) | | ....................................... 2 World Mine Production .......................................tsunami caused widespread 1 devastation across the region, as tens of thousands of people were killed, hundreds...species, including ixiolite, microlite, tantalite, tapiolite, and wodginite. Tantalum-bearing mineral deposits...Information Services Ltd., 2012). World Mine Production In 2011, world mine production of tantalum increased...in 2010. Rwanda accounted for 27 percent of total mine production in 2011; Brazil accounted for 20 percent; |  | | Journal (article/letter/editorial) | | PEGMATITE Erste Ăsterreichische Arbeitstagung MontanuniversitĂ€t Leoben 11. April 2014 Zusammenfassung...Melcher MITT.ĂSTERR.MINER.GES. 160 (2014) PEGMATITE - ERSTE ĂSTERREICHISCHE ARBEITSTAGUNG von Johann...MontanuniversitĂ€t Leoben die 1. Arbeitstagung zum Thema Pegmatite statt. Die Veranstaltung wurde vom Department...Geologie und LagerstĂ€ttenlehre) organisiert. Pegmatite sind sowohl aus wirtschaftlichen als auch wissenschaftlichen...hochgradiger Metamorphose gegenĂŒber. Gerade die Pegmatite in den Ostalpen stellen ein Musterbeispiel fĂŒr |  | | Journal (article/letter/editorial) | | tantalum deposit, metallogeny of rare metals, pegmatite, granite magmatism, alkaline magmatism, tantaloniobates...also be made by microlite, wodginite, ixiolite, tapiolite, and the other minerals of the same type. GEOLOGY...(22) Motzfeldt; (23) Tanbreez; (24) Crevie; (25) Kenticha; (26) Three Alloes; (27) Tastyg; (28) Morrua;...Kamativi Manono-Kitotolo Motzfeldt Tanbreez Crevie Kenticha Three Alloes Tastyg Morrua Marropino Nanping Alberta...4data obtained from the analog located in the same region rather than from the object itself are italicized; |  | | Journal (article/letter/editorial) | | from crystallization experiments of tantalite-tapiolite Marieke Van Lichtervelde1,*,â , Francois Holtz2...Resources (BGR), 30655 Hannover, Germany Abstract Tapiolite [FeTa2O6] and columbite-group minerals [(Fe,Mn)(Ta...influence the compositional gap. In this study, tapiolite and columbite-group minerals (CGM) were crystallized...a size as small as 500 nm were analyzed with a field emission gun (FEG) electron microprobe. The results...slightly affect the compositional gaps between tapiolite and CGM, whereas high fO2 leads to complete solid |  | Melcher, F., Graupner, T., Sitnikova, M., Henjes-Kunst, F., OberthĂŒr, T., GĂ€bler, H.-E, Bahr, A., Gerdes, A., BrĂ€tz, H., Rantitsch, G. (2009) Ein Herkunftsnachweis fĂŒr Niob-Tantalerze am Beispiel afrikanischer Selten-Element Pegmatite. Mitteilungen der Ăsterreichischen Mineralogischen Gesellschaft, 155. | Journal (article/letter/editorial) | | NIOB-TANTALERZE AM BEISPIEL AFRIKANISCHER SELTEN-ELEMENT-PEGMATITE von Frank Melcher1 , Torsten Graupner1 , Maria...Ta2O5 (Marropino, 2007); (Kenticha, 2007); Produktions-beginn Mocuba mine seit geringer artisanaler fĂŒr...Granite palĂ€oprotero-zoisch, spĂ€t-orogen LCT-Pegmatite Kokobin, Issia 6°N historisch bedeutend; derzeit...Amphibolite, Gneise, Granite archaisch LCT-Pegmatite Bikita, Benson 17-20°S 31-32°E Simbabwe Ghana...Birimian10 panafrikanisch, post-orogen LCT-Pegmatite Ijero/Ikoro, Iregun, Egbe, Wamba, Jemaa, Gurum |  | | Journal (article/letter/editorial) | | % from tin slag refining and 10 % from secondary mine concentrates. Due to rapid industrialisation and...Canada account for about 92 and 7 % of Nb world mine production, respectively. Since the bulk of the...maintenance. Ta production at the massive Greenbushes pegmatite (Australia) has stopped, though Li production...start-up time for new operations. The Kenticha mine (Ethiopia) is a past producer that may re-enter production...studies on new developments) are required in any mine as price levels vary for each deposit and are dependent |  | | Journal (article/letter/editorial) | | Ta-bearing phases, but microlite, wodginite, tapiolite and Ta-rich cassiterite also occur. CGM crystals...Keppler, 1997; Linnen, 1998; London, 2008) and field evidences in pegmatites (Dewaele et al., 2015) and...obtained from the ancient open pit of the Penouta mine (Fig. 1), corresponding to the apical zone. Whole...Ercit et al. (1992a). The structural formula of tapiolite and cassiterite were calculated on the basis of...rich phases in the Penouta leucogranite although tapiolite, microlite, and wodginite also occur. Cassiterite |  | | Report (issue) | | FRONTISPIECE: Historic pump at the Wodgina tantalumâtin mine. Brought from Port Hedland by camel train about...manganotantalite crystals from Moolyella, Pilbara region. Simpson Collection, Western Australian Museum........................ 24 Regional rare-metal pegmatite zoning and lithogeochemical anomalies ................................................... 25 Pegmatite dimensions and structure .............................. 63 Bernic Lake tantalumâlithiumâcaesium mine ............................................... |  | Gonçalves, , Melgarejo, , Alfonso, , Amores, , Paniagua, , Neto, , Morais, , CamprubĂ, (2019) The Distribution of Rare Metals in the LCT Pegmatites from the GiraĂșl Field, Angola. Minerals, 9 (10) 580 doi:10.3390/min9100580 | Journal (article/letter/editorial) | | Rare Metals in the LCT Pegmatites from the GiraĂșl Field, Angola Antonio Olimpio Gonçalves 1 , Joan-Carles...Abstract: The GiraĂșl granitic pegmatite field in Angola is composed of five pegmatite types, the most evolved...pegmatites are rich in Nb-Ta oxide minerals and the field has a moderate interest for critical elements such...the evolution of the pegmatites and within each pegmatite body from border to inner zones, and especially...minerals is quite characteristic in granites and pegmatite rocks and gives us information about their petrogenesis |  | Shikika, Alidor, Zabene, Francois, Muvundja, Fabrice, Mugumaoderha, Mac C., Colaux, Julien L., Aatach, Mohamed, Gaydardzhiev, Stoyan (2021) Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching. Minerals, 11 (12) 1392 doi:10.3390/min11121392 | Journal (article/letter/editorial) | | recoveries will fill the existing knowledge gap in the field and contribute to the rise of industrial interest...eventual economic interest are cassiite (SnO 2) and tapiolite (Fe,Mn)(Ta,Nb)2O6, while the major gangue-forming...gangue-forming mineral is terite (SnO2 ) and tapiolite (Fe,Mn)(Ta,Nb)2 O6 , while the major gangue-forming mineral...Yimam, A.; Woldetinsae, G. Decomposition of the Kenticha mangano-tantalite ore by HF/H2 SO4 and KOH fusion |  | Fosso Tchunte, Periclex Martial, Tchameni, Rigobert, AndrĂ©-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) | | related to the S-type granites of [19]. The high-field strength elements (HFSE) Nb and Ta present both...bearing phases. Rare-metal granite (RMG) and pegmatite-bearing rare-element are described in several...of 36 Older Granites of Nigeria, Adola Belt of Ethiopia) and anorogenic (Younger Granites of Nigeria)...network of Pan-African belt, and the African pegmatite and rare-metal granite provinces (Modified from...58â60]. 1.1 Man Shield. 1.2 Congo rare-element pegmatite and rare-metal granite provinces (Modified from |  | | Report (issue) | | .B3 Graph showing dates associated with all the mine sites on the U.S. Environmental Protection Agencyâs...production, U.S. apparent consumption, and U.S. mine production of antimony from 1900 to 2012............................F2 Graph showing world cobalt mine and refinery production and apparent consumption.....................F2 Graph showing world cobalt mine production from 1950 to 2011......................F4. Pie chart showing percentage of world cobalt mine production in 2011, by country................. |
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