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Journal articles on the topic 'Tantale – Minerais'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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1

Simandl, George J., Richard O. Burt, David L. Trueman, and Suzanne Paradis. "Economic Geology Models 2. Tantalum and Niobium: Deposits, Resources, Exploration Methods and Market – A Primer for Geoscientists." Geoscience Canada 45, no. 2 (2018): 85–96. http://dx.doi.org/10.12789/geocanj.2018.45.135.

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The world’s main tantalum (Ta) resources are in pegmatites (e.g. Wodgina, Australia), rare element-enriched granites (e.g. Abu Dabbab, Egypt), peralkaline complexes (e.g. Nechalacho, Canada), weathered crusts overlying the previously mentioned deposit types, and in placers. Niobium (Nb) resources with the highest economic potential are in weathered crusts that overlie carbonatite complexes (e.g. Catalão I and II, Brazil). Brazil accounts for 90% of the global Nb mine production with another 9% coming from the Niobec Mine, Canada (a hard-rock underground mine). However, at least 17 undeveloped

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2

Hrinchenko, O., S. Bondarenko, and T. Mironchuk. "GRANITOIDS, RARE-METAL PEGMATITES AND Ta-Nb MINERALIZATION OF SHPOLIANO-TASHLYK ORE AREA (INGUL MEGABLOCK, UKRAINIAN SHIELD)." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 4 (83) (2018): 24–29. http://dx.doi.org/10.17721/1728-2713.83.03.

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Composition of granites, genetically associated pegmatites and superimposed metasomatites distributed within Shpoliano-Tashlyk ore area (Ingul megablock) is considered. It is established, that on the basis of similarity in their petrographic and petrochemical features granitoids of the area can be related to single complex. Features of ore mineralization are defined by both composition of granitoids (Sgranites) after which rare-metal pegmatites are formed and intensity of superimposed metasomatic alterations. Main minerals-concentrators of Ta and Nb mineralization in granitic pegmatites and me

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3

Huber, Miłosz, Daniel Kamiński, and Urszula Maciołek. "Columbite–Tantalite from Northern Scandinavia (Kaustinen, Kolmozero) Pegmatites: An Optical and Spectroscopic Properties." Crystals 13, no. 4 (2023): 612. http://dx.doi.org/10.3390/cryst13040612.

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LCT (lithium–cesium–tantalum) pegmatites from the Kaustinen and Kolmozero regions contain columbite–tantalite mineralization, which has been presented in this study. Crystal structure, Raman microscopy, and optical property analyses of these minerals were performed. As a result of the structural studies and micro-area analyses, it was determined that these minerals in the pegmatites in question constitute a solid solution with numerous Mn-Fe and Nb-Ta substitutions within a single crystal. The ratio between Mn-Fe and Nb-Ta can change from crystal to crystal, which makes it impossible to find p

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4

Alekseev, Viktor I., and Ivan V. Alekseev. "The Presence of Wodginite in Lithium–Fluorine Granites as an Indicator of Tantalum and Tin Mineralization: A Study of Abu Dabbab and Nuweibi Massifs (Egypt)." Minerals 13, no. 11 (2023): 1447. http://dx.doi.org/10.3390/min13111447.

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This study examines the accessory wodginite and the discovery of titanium-bearing wodginite and Fe and Ti-bearing wodginite in lithium-fluorine granites from the Abu Dabbab and Nuweibi massifs in Eastern Egypt. The wodginite group’s mineral association includes tantalum-bearing cassiterite and tin-bearing tantalum–niobate minerals: tantalite-(Mn), columbite-(Mn), and microlite. Three forms of wodginite crystallization were identified: (1) rims around columbite-(Mn) and tantalite-(Mn) varying from 1.5 to 21.9 μm in thickness, (2) micro-inclusions in cassiterite ranging from 5.4 to 27.0 μm in si

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5

MATONDO, Idylle Plachini LOUFOUANDI, and Mikhail IVANOV. "Composition and probable ore igneous rocks source of columbite from alluvial deposits of Mayoko district (Republic of the Congo)." Journal of Mining Institute 242 (May 24, 2020): 139. http://dx.doi.org/10.31897/pmi.2020.2.139.

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The article presents the results of optical, electron microscopic and electron microprobe studies of columbite group minerals, collected during heavy mineral concentrate sampling of alluvial deposits in the Mayoko region (Republic of the Congo). The aim of the study is revealing tantalum niobates ore body in this region. We found that these minerals in loose deposits are represented by two grain-size groups: less than 1.6 mm (fine fraction) and 1.6-15 mm (coarse fraction). The grains of both fractions belong mainly to columbite-(Fe), less often to columbite-(Mn), tantalite-(Mn) and tantalite-(

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6

Alekseev, Viktor I., and Ivan V. Alekseev. "Tungsten-Bearing Wodginite from the Kester Deposit, Eastern Siberia, Russia." Minerals 13, no. 2 (2023): 231. http://dx.doi.org/10.3390/min13020231.

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Li-F granites from the Kester deposit (Yana Plateau in Yakutia, Russia) are proved to be connected with a rare-metal complex of accessory minerals: montebrasite, columbite-(Mn), columbite-(Fe), tantalite-(Mn), Ta-bearing cassiterite, U-bearing microlite, W-bearing ixiolite, niobian ferberite, U–Hf-rich zircon, and Ta-bearing rutile. Accessory wodginite was discovered at depths of up to 150 m in association with tantalite-(Mn), columbite-(Mn), and cassiterite. According to the content of WO3 (1.23%–3.33%) and the values of Mn/(Mn + Fet) and Ta/(Ta + Nb), Yakut wodginite is an intermediate miner

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7

Kabatesi, Juliette Confiance, Jules Uwizeyimana, Digne Edmond Rwabuhungu Rwatangabo, and Jei-Pil Wang. "Evaluation of Efficiency of Using Mechanized Processing Techniques to Recover Tin and Tantalum in Gatsibo, Eastern Province, Rwanda." Minerals 12, no. 3 (2022): 315. http://dx.doi.org/10.3390/min12030315.

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Rwanda is known to be among the top producers of tin and tantalum, despite having low recovery and grades. This study was carried out to evaluate the efficiency of using mechanized methods to increase the recovery rate and grades of tin and tantalum mined in Gatsibo, Eastern Province, Rwanda, since the general separation techniques used are artisanal. The minerals in those mines include cassiterite (SnO2) and colombite–tantalite ((Fe,Mn)(Ta,Nb)2O5), with impurities such as Al2O3, Fe2O3, MnO, MgO, Cao, Na2O, K2O, TiO2, and P2O5. A combination of gravity separation techniques, including shaking

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8

Li, Siyang, Jie Liu, Yuexin Han, and Shumin Zhang. "Review on the Beneficiation of Li, Be, Ta, Nb-Bearing Polymetallic Pegmatite Ores in China." Minerals 13, no. 7 (2023): 865. http://dx.doi.org/10.3390/min13070865.

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Lithium-bearing polymetallic pegmatite ores are an important raw material for lithium extraction. They contain not only lithium but also other associated elements such as beryllium, tantalum, and niobium, with great recovery values. It is therefore often called lithium-bearing polymetallic pegmatite ore (LPPO). The recovery and utilization of Be-bearing minerals in LPPOs have yet to be further studied. This paper briefly expounds the geological aspects of LPPO deposits in China and Chinese experiences on the beneficiation of LPPOs, with special emphasis on the flotation separation of lithium-b

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9

Adoze, U. J., F. Abubakar, G. D. Ochu, O. A. Danga, M. L. Adamu, and Y. Baba. "Geological and geochemical analyses of pegmatites in Egbe, Isanlu (sheet 225), Southwestern Nigeria." Scientia Africana 23, no. 2 (2024): 188–206. http://dx.doi.org/10.4314/sa.v23i2.17.

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The hitherto pegmatite of the Egbe area has been known to bear valuable economic minerals. They are associated with other rock types including banded gneiss, schist, amphibolite, and granites. These pegmatites and the host rocks were studied in detail to elucidate their petrochemical and geochemical features and also to assess the mineralization of Tantalum- iobium and other minerals. Geological field mapping was done, thin section-petrographic analysis of ten representative rock samples was performed and nineteen whole-rock samples were analyzed for major and trace elements including REES aid

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10

Dostal, Jaroslav, and Ochir Gerel. "Occurrences of Niobium and Tantalum Mineralization in Mongolia." Minerals 12, no. 12 (2022): 1529. http://dx.doi.org/10.3390/min12121529.

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Niobium and tantalum are two rare metals that have similar physical and chemical properties and occur together in nature. They are considered to be strategic and critical materials for the economy and national security of many industrial countries. Both elements are on the 2022 List of Critical Minerals of the USA as well as on the European Union’s List of Critical Raw Materials. They rarely substitute for common elements in rock-forming minerals but are essential components in a range of rare minerals, particularly oxides and subordinately silicates. The economically important minerals are ox

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11

Graupner, T., F. Melcher, H. E. Gäbler, M. Sitnikova, H. Brätz, and A. Bahr. "Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data." Mineralogical Magazine 74, no. 4 (2010): 691–713. http://dx.doi.org/10.1180/minmag.2010.074.4.691.

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AbstractNew data on rare earth element (REE) concentrations and distribution patterns of columbite-tantalite minerals from Ta-ore provinces worldwide are presented. The REE geochemistry was studied by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Five major types of chondrite-normalized REE distribution patterns are defined for columbite-group minerals (CGM) from lithium-caesium-tantalum (LCT) pegmatites and rare-metal granites. Features to discriminate between the types include (1) the shape of the pattern (e.g. flat or concave), (2) calculated ratios between groups

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12

Schirmer, Thomas, Jessica Hiller, Joao Weiss, et al. "Behavior of Tantalum in a Fe-Dominated Synthetic Fayalitic Slag System—Phase Analysis and Incorporation." Minerals 14, no. 3 (2024): 262. http://dx.doi.org/10.3390/min14030262.

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Pyrometallurgical processes produce slags that may contain valuable elements because of their high oxygen affinity. However, the concentration is extremely low, which causes losses. In fact, these elements, for example, tantalum and rare earth elements, are less than 1% recycled. To return such technologically important elements to the material cycle, pyrometallurgically is used to enrich them in the simplest possible compounds within the slag, which have favorable properties for recovery (morphology, crystal size, magnetic properties), allowing further mechanical separation. The purpose of mo

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13

Zozulya, Dmitry, Lyudmila N. Morozova, Kåre Kullerud, and Ayya Bazai. "Nb-Ta-Sn Oxides from Lithium-Beryllium-Tantalum Pegmatite Deposits of the Kolmozero–Voronja Belt, NW Russia: Implications for Tracing Ore-Forming Processes and Mineralization Signatures." Geosciences 14, no. 1 (2023): 9. http://dx.doi.org/10.3390/geosciences14010009.

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In this paper we present textural and compositional data for columbite group minerals (CGMs) and associated Nb-Ta-Sn oxides from lithium-beryllium-tantalum pegmatite deposits of the Kolmozero–Voronja belt, NW Russia, with the aim of deciphering these characteristics for minerals from deposits with different mineral signatures and lithium ore grade. Minerals from four deposits, including two of world-class (Kolmozero and Polmostundra), are examined. The main controlling factors for CGM compositional ranges are the diversity and rate of magmatic fractionation, hydrothermal overprint and mineral

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14

Andrade Pinto, Anna Caroline, and Tiago Felipe Arruda Maia. "Characterization of secondary deposits of columbite-tantalite minerals found in the city of Rorainópolis (RR), Brazil." International Journal for Innovation Education and Research 8, no. 4 (2020): 450–68. http://dx.doi.org/10.31686/ijier.vol8.iss4.2299.

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Many of the studies about mineral deposits are bringing great information to the scientific community, providing, for example, general characteristics of these deposits, possible source areas and its used in some cases as prospective tools to help in geological mapping. In this way, this study aimed to characterize the alluvial secondary deposits of columbite-tantalite that were found near vicinal 12, about 50km north/northeast of Rorainópolis city, between the BR-174 and BR-210 roads, in the state of Roraima (Brazil), bases on 4 samples that were brought by a resident of the region. To fulfil

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15

BUYSE, Florian, Stijn DEWAELE, Matthieu N. BOONE, and Veerle CNUDDE. "Contribution of 3D automated mineralogy in unraveling the formation history of Nb-Ta-Sn mineralized LCT pegmatites in the Karagwe-Ankole belt (Central Africa)." Geologica Belgica 27, no. 1-2 (2024): 1–14. http://dx.doi.org/10.20341/gb.2024.001.

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The Mesoproterozoic Karagwe-Ankole belt (KAB) in Central Africa hosts important mineralized lithium-cesium-tantalum pegmatites enriched in Sn, Nb, Ta and W. Microscopic techniques are required to further refine the paragenetic history of mineralized pegmatites in the KAB and to understand the pegmatite-forming processes leading to an enrichment of economically important minerals. Using a combination of scanning electron microscopy (SEM)-based automated mineralogy systems with X-ray computed tomography (µCT), we investigated the mineral relationships in a three-dimensional (3D) space. This pape

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16

McNeil, Alysha G., Robert L. Linnen, Roberta L. Flemming, and Mostafa Fayek. "An experimental approach to examine fluid-melt interaction and mineralization in rare-metal pegmatites." American Mineralogist 105, no. 7 (2020): 1078–87. http://dx.doi.org/10.2138/am-2020-7216.

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Abstract Niobium and tantalum, rare metals and high field strength elements (HFSEs) that are essential to modern technologies, are concentrated among others in lithium-cesium-tantalum (LCT) pegmatites and rare metal granites. The most important hosts for Nb-Ta in these types of deposits are the columbite group minerals (columbite-tantalite), but at some ore deposits significant Ta is also contained in wodginite, microlite, and tapiolite. Previous solubility experiments of HFSE minerals have been limited to high temperatures because of the slow diffusivities of HFSEs in granitic melts. An exper

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17

Yang, Zhuming, Renkui Song, Kejie Tao, and Peishan Zhang. "Columbite-tantalite minerals from Nanping granitic pegmatites, South China: compositional trends and genetic implications." Neues Jahrbuch für Mineralogie - Monatshefte 2003, no. 8 (2003): 363–73. http://dx.doi.org/10.1127/0028-3649/2003/2003-0363.

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18

Grew, Edward S. "The Minerals of Lithium." Elements 16, no. 4 (2020): 235–40. http://dx.doi.org/10.2138/gselements.16.4.235.

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Lithium is rare in the cosmos, but the formation of continental crust has concentrated lithium into economic deposits. The 124 recognized Li mineral species occur largely in four geologic environments: (1) lithium–cesium–tantalum (LCT) granitic pegmatites and associated metasomatic rocks; (2) highly peralkaline pegmatites; (3) metasomatic rocks not directly associated with pegmatites; (4) manganese deposits. The geologically oldest Li minerals are reported from LCT pegmatites and date to 3,000–3,100 Ma, a critical period in the evolution of the continental crust and the rate of its generation.

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Nete, Motlalepula, Walter Purcell, and Johann T. Nel. "Tantalite Beneficiation through Sequential Separation of Radioactive Elements, Iron and Titanium by Magnetic Separation and Acid Leaching ." Advanced Materials Research 1019 (October 2014): 419–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1019.419.

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The Process Beneficiation of Minerals such as the Tantalum and Niobium Ores May Vary Significantly and the Final Sequence of Steps Normally Depends on the Physiochemical Properties. these Properties are Often Utilised in Designing a Processing Route. Removal of Iron and Titanium from the Manganotantalite and Ferrotantalite Samples in this Study was Successfully Accomplished by Magnetic Separation. Acid Leaching Using H2SO4 on the other Hand Removed a Large Portion of Thorium and Uranium in these Samples. Analytical Results Indicated that 66(1) and 54.7(5)% of Total Fe and Ti Respectively, and

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Abdalla, H. M., H. A. Helba, and F. H. Mohamed. "Chemistry of columbite-tantalite minerals in rare metal granitoids, Eastern Desert, Egypt." Mineralogical Magazine 62, no. 6 (1998): 821–36. http://dx.doi.org/10.1180/002646198548197.

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AbstractParagenetic, textural, and chemical characteristics of columbite-tantalite minerals are examined as steps towards identifying the metallogenetic processes of their host granitoids. Columbite-tantalite-bearing granitoids of the Eastern Desert province of Egypt can be categorized into: (i) metaluminous alkali granites; (ii) peraluminous Li-albite granites; and (iii) metasomatized biotite and/or muscovite granite (i.e. apogranites).Columbite of the alkali granite is of FeNb2O6 composition and associated with annite. The low F and Li contents of the associated mica precludes the important

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Alekseev, V. I., and Yu B. Marin. "COLUMBITE-TANTALITE OF THE KESTER DEPOSIT (EASTERN YAKUTIA)." Tikhookeanskaya Geologiya 41, no. 2 (2022): 109–20. http://dx.doi.org/10.30911/0207-4028-2022-41-2-109-120.

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Three mineral species of the columbite group were installed at the Kester deposit (Eastern Yakutia): columbite-(Fe), columbite-(Mn) and tantalite-(Mn), which are part of rare-metal granites and ongonites, albitites and greisens. Columbite-(Mn) prevails: Ta/(Ta + Nb) = 0.30, Mn/(Mn + Fe) = 0.64. The generalized formula for the columbite-tantalite of deposit is (Mn0.61Fe0.34)0.95(Nb1.37Ta0.58Ti0.04W0.03Sn0.01)2.03O6. Columbite tantalite combine the polymineral individuals with concentric growth zonality (from core to rim): columbite-(Fe) → columbite-(Mn) → tantalite-(Mn) + uranmicrolite → columb

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Shimizu, Rinon, Ryuki Hanazawa, and Naoyuki Morita. "Influence and Effect of Pyrolysis with Additives in Tantalum Capacitors." International Journal of Environmental Science and Development 13, no. 4 (2022): 138–43. http://dx.doi.org/10.18178/ijesd.2022.13.4.1384.

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In recent years, the demand for tantalum capacitors has been increasing due to the miniaturization of electronic devices. Tantalum capacitors, which use the rare metal tantalum as the capacitor element, are used in electronic devices such as cell phones because they are smaller and have a higher capacity than conventional capacitors. In Japan, there are reports that minerals containing rare elements are being extracted from discarded electronic and electrical equipment to produce medals for the 2020 Tokyo Olympics. In Japan, many used electrical products containing rare elements are discarded,

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Gordo, E., F. García-Carcedo, and J. M. Torralba. "Obtención de carburos de tantalio y de niobio por reducción carbotérmica del mineral columbotantalita." Revista de Metalurgia 34, Extra (1998): 395–99. http://dx.doi.org/10.3989/revmetalm.1998.v34.iextra.779.

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Uher, Pavel, Martin Števko, and Sergii Kurylo. "Minerály skupiny columbitu a mikrolitu v granitovom pegmatite pri Liešťanoch: prvý výskyt vzácnoprvkovej Nb-Ta mineralizácie v Strážovských vrchoch (Slovenská republika)." Bulletin Mineralogie Petrologie 28, no. 2 (2020): 347–52. http://dx.doi.org/10.46861/bmp.28.347.

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Accessory minerals of columbite and microlite groups were identified in granitic pegmatite dike intruded into parental Carboniferous (~350 Ma) leucogranites of the crystalline basement of the Tatric Unit, Central Western Carpathians. The pegmatite is situated on E slope of Bystrý Hill near Liešťany village, the Strážovské vrchy Mts., Slovakia. Primary columbite-(Fe) forms euhedral crystal (~3 mm across) with diffuse internal zoning reflecting a relatively small compositional variations: Mn/(Mn + Fe) = 0.40 - 0.45 and Ta/(Ta + Nb) = 0.21 - 0.24. Secondary anhedral domains of Ta-rich columbite-(

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Neiva, Ana M. R. "Micas, feldspars and columbite-tantalite minerals from the zoned granitic lepidolite-subtype pegmatite at Namivo, Alto Ligonha, Mozambique." European Journal of Mineralogy 25, no. 6 (2014): 967–85. http://dx.doi.org/10.1127/0935-1221/2013/0025-2335.

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D’yachkov, Boris A., Ainel Y. Bissatova, Marina A. Mizernaya, et al. "Mineralogical Tracers of Gold and Rare-Metal Mineralization in Eastern Kazakhstan." Minerals 11, no. 3 (2021): 253. http://dx.doi.org/10.3390/min11030253.

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Replenishment of mineral resources, especially gold and rare metals, is critical for progress in the mining and metallurgical industry of Eastern Kazakhstan. To substantiate the scientific background for mineral exploration, we study microinclusions in minerals from gold and rare-metal fields, as well as trace-element patterns in ores and their hosts that may mark gold and rare-metal mineralization. The revealed compositions of gold-bearing sulfide ores and a number of typical minerals (magnetite, goethite, arsenopyrite, antimonite, gold and silver) and elements (Fe, Mn, Cu, Pb, Zn, As, and Sb

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Halas, Stanislaw. "Low-Blank Crucible for Argon Extraction from Minerals at Temperatures up to 1550°C." Geochronometria 27, no. -1 (2007): 1–3. http://dx.doi.org/10.2478/v10003-007-0014-1.

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Low-Blank Crucible for Argon Extraction from Minerals at Temperatures up to 1550°C The new version of a double-vacuum crucible for fusion of small samples of refractory minerals has been described recently by Halas (2006). This novel type of high temperature crucible was further improved in the following important points: (1) The expensive material, tantalum, was replaced by much cheaper molybdenum which also appears to be significantly less corrosive in the presence of hot boron nitride ceramic used as the insulator, and (2) a versatile temperature controller was assembled from commercially a

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Augsburger, M. S., J. C. Pedregosa, G. M. Sosa, and R. C. Mercader. "Mössbauer Assessment of Cation Disorder in Columbite–Tantalite Minerals." Journal of Solid State Chemistry 143, no. 2 (1999): 219–23. http://dx.doi.org/10.1006/jssc.1998.8090.

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Zuo, Yushan, Zhengxi Gao, Lei Zuo, et al. "Ultrastructure of a Columbite-Tantalite Mineral from the Zhaojinggou Ta-Nb Deposit in the North China Craton: Direct Evidence of the Formation Mechanism of the Columbite-Group Minerals." Geofluids 2022 (December 3, 2022): 1–9. http://dx.doi.org/10.1155/2022/8125419.

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The formation of columbite-group mineral phases in peraluminous granite has not been demonstrated to date. Here, a nanoscale study of the columbite-tantalite mineral in the Zhaojinggou Nb-Ta deposit in North China Craton elucidated its formation mechanism and the role of fluids in Nb-Ta mineralization. Transmission electron microscopy (TEM) analysis of a focused ion beam cut of the columbite-tantalite mineral revealed a comparatively well-ordered mineral structure. Energy-dispersive X-ray spectroscopy (EDS) revealed the presence of Nb, Ta, Mn, W, Fe, Sn, and Pb in the columbite-tantalite miner

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MOISEENKO, NATALIA VALENTINOVNA, and SVETLANA MIKHAILOVNA AVRAMENKO. "SILVER IN THE GOLD DEPOSITS OF THE AMUR REGION." Messenger AmSU, no. 93 (2021): 130–36. http://dx.doi.org/10.22250/jasu.93.27.

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The main minerals of native silver hubs on gold deposits of the Amur region (Albyn, Malomyr, Pioner, Pokrovskoe) were studied. It has been established that silver has a positive correlation with gold, zinc, arsenic, antimony, lead and cadmium. There is a negative correlation of silver with zirconium, yttrium, hafnia, tantalum and rare earth elements.

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Slack, John F., Frederick M. Beck, Dwight C. Bradley, Myles M. Felch, Robert G. Marvinney, and Amber T. H. Whittaker. "Potential for critical mineral deposits in Maine, USA." Atlantic Geoscience 58 (June 28, 2022): 155–91. http://dx.doi.org/10.4138/atlgeo.2022.007.

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An analysis of the potential for deposits of critical minerals and elements in Maine presented here includes data and discussions for antimony, beryllium, cesium, chromium, cobalt, graphite, lithium, manganese, niobium, platinum group elements, rhenium, rare earth elements, tin, tantalum, tellurium, titanium, uranium, vanadium, tungsten, and zirconium. Deposits are divided into two groups based on geological settings and common ore-deposit terminology. One group consists of known deposits (sediment-hosted manganese, volcanogenic massive sulphide, porphyry copper-molybdenum, mafic- and ultramaf

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Mykhailov, V., S. Vyzhva, and S. Paiuk. "SYSTEM ANALYSIS OF THE MINERAL RAW MATERIAL BASE OF STRATEGIC MINERALS OF UKRAINE." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 4 (99) (2022): 36–44. http://dx.doi.org/10.17721/1728-2713.99.05.

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A systematic analysis of the mineral resource base (MRB) of strategically important minerals for the Ukrainian economy is carried out. Four categories of strategic minerals from the point of view of their investment attractiveness are identified: traditional (iron, manganese, titanium, uranium, kaolin, sand molding, building stones, quartz raw materials, refractory clay); highly promising (rare earths, zirconium and hafnium, lithium, scandium, germanium, graphite, potassium salts, abrasive raw materials, piezooptical raw materials); promising (nickel, cobalt, chromium, aluminum, copper, tantal

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Silva, A. L., and E. W. V. Sousa. "New Route of Utilization of Pegmatites Tailings to Application as a Ceramics Raw Materials." Materials Science Forum 820 (June 2015): 18–23. http://dx.doi.org/10.4028/www.scientific.net/msf.820.18.

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The proposal to obtain a new route for exploitation of tailings from pegmatite emerged from the need of many companies that showed to reuse of these tailings as raw materials ceramics. The pegmatites represent a large part of available industrial minerals. These can be classified into: kaolin, feldspar, mica, quartz and metallic minerals such as tantalite / columbite and others. The consumer markets for these minerals are glassmaking, ceramic industries, paper, pulp, metallurgy, etc. Order for the product is fit for sale ceramics and metals companies must be of high purity of this raw material

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Osburg, Thomas. "Branding Raw Material to Improve Human Rights: Intel’s Ban on Conflict Minerals." GfK Marketing Intelligence Review 8, no. 1 (2016): 36–41. http://dx.doi.org/10.1515/gfkmir-2016-0006.

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Abstract Many companies seek to take over more responsibility for their supply chain and their raw materials. Intel was one of the first companies investigating the origin of conflict minerals like tin, tantalum, gold or tungsten, which are used in many electronic products. Their path to ultimately offering conflict-free microprocessors took more than five years of consistent preparation and intensive reengineering of the business process. They identified smelters as a bottleneck in the supply chain and started cooperating closely with them to trace their minerals’ supply. By developing a bag-

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Osovetsky, B. M., S. B. Suslov, and I. V. Badyanova. "Tantal-Niobium Minerals of the Upper Riphean Fedotovskaya Suite (the Middle Urals)." Вестник Пермского университета. Геология 18, no. 4 (2019): 332–46. http://dx.doi.org/10.17072/psu.geol.18.4.332.

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Melin, Yves, Alex Brackett, and Estelle Levin. "Revisiting the Conflict Minerals Rule." Global Trade and Customs Journal 10, Issue 2 (2015): 73–86. http://dx.doi.org/10.54648/gtcj2015006.

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Companies listed in the U.S. are required by Section 1502 of the Dodd-Frank Act to report whether they manufacture products that incorporate socalled conflict minerals (defined as gold, tin, tungsten and tantalum coming from the Democratic Republic of Congo and its neighboring countries). The first part of this article reviews the conflict minerals rules of Dodd-Frank, and assesses their impact. In the authors' view, Dodd-Frank has failed to achieve its objective to reduce the financing of armed conflicts in Eastern Congo through the illegal trade in minerals, and has created a de facto embarg

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Amuda, M. O. H., D. E. Esezobor, and G. I. Lawal. "Adaptable Technologies for Life – Cycle Processing of Tantalum Bearing Minerals." Journal of Minerals and Materials Characterization and Engineering 06, no. 01 (2007): 69–77. http://dx.doi.org/10.4236/jmmce.2007.61006.

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Germakhanov, Aslambek A., Alexander I. Chernykh, Mikhail M. Girfanov, Valery A. Istomin, and Andrey S. Svatkov. "The state and prospects of development of the mineral resource base of solid minerals of the Bolivarian Republic of Venezuela." Ores and metals, no. 4 (January 11, 2023): 10–31. http://dx.doi.org/10.47765/0869-5997-2022-10020.

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The status and prospects of the mineral resource base of solid minerals of the Bolivarian Republic of Venezuela, as well as possibilities for developing the RussianVenezuelan cooperation in the field of geology and mineral resource management are considered. Venezuela has world's largest oil reserves and a wide range of solid minerals (gold, diamonds, nickel, bauxite, iron ores, tantalum and niobium, other rare and base metals, various industrial minerals), which resource base retains significant growth prospects. The main direction of intensification of the mining industry is associated with

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Tanko, I. Y., and K. Dzigbodi-Adjimah. "Ore Microscopy of the Pegmatites of Keffi Area, North Central Nigeria." European Journal of Environment and Earth Sciences 2, no. 5 (2021): 34–40. http://dx.doi.org/10.24018/ejgeo.2021.2.5.174.

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Investigation of the pegmatites of Keffi area was carried out in reflected light microscopy to determine the texture, elemental composition, and the semi-quantitative analysis of the ore minerals from the three groups of pegmatites identified in Keffi area: the non-mineralised, the intermediate and the mineralised pegmatites. Backscattered Electron (BSE) images and Wavelength Dispersive Spectrometry (WDS) were used. Petrographically the portion which is characterised by profuse albitisation, sericitisation and silicification is also associated with the development of cleavelandite, lepidolite,

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Ghorbani, Yousef, Rob Fitzpatrick, Melanie Kinchington, Gavyn Rollinson, and Patrick Hegarty. "A Process Mineralogy Approach to Gravity Concentration of Tantalum Bearing Minerals." Minerals 7, no. 10 (2017): 194. http://dx.doi.org/10.3390/min7100194.

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Patel, Khageshwar Singh, Aditya Shukla, Neeta Agarwal, and Peter Hoffmann. "Visible Spectrophotometric Determination of Tantalum in Soil, Sediment, Minerals, and Alloys." Journal of AOAC INTERNATIONAL 84, no. 2 (2001): 399–406. http://dx.doi.org/10.1093/jaoac/84.2.399.

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Abstract A new, sensitive, and selective method is described for the spectrophotometric determination of Ta(V). The method is based on the extraction of the Ta(V)–F−–CV+ complex (CV+ = crystal violet cation) with a benzene solution of imidoyl derivatives (ID), i.e., N,N′-diphenylbenzamidine (DPBA), N-hydroxy- N,N′-diphenylbenzamidine, and N-(2,5-dimethyl)phenyl-p-tolylimidoylphenylhydrazine, from sulfuric acid solution; DPBA was selected for detailed study. The molar absorptivities of the Ta(V)–F−–CV+–ID complexes in the benzene solution were in the range of (1.00–1.65) × 105 L/mol·cm at 600 n

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Mackay, D. A. R., and G. J. Simandl. "Pyrochlore and columbite-tantalite as indicator minerals for specialty metal deposits." Geochemistry: Exploration, Environment, Analysis 15, no. 2-3 (2015): 167–78. http://dx.doi.org/10.1144/geochem2014-289.

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Martin, Robert F., and Pierre-Alain Wülser. "Niobium and tantalum in minerals: Siderophile, chalcophile or lithophile, and polyvalent." Journal of Geochemical Exploration 147 (December 2014): 16–25. http://dx.doi.org/10.1016/j.gexplo.2014.05.006.

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Alfonso, P., S. A. Hamid, M. Garcia-Valles, et al. "Textural and mineral-chemistry constraints on columbite-group minerals in the Penouta deposit: evidence from magmatic and fluid-related processes." Mineralogical Magazine 82, S1 (2018): S199—S222. http://dx.doi.org/10.1180/minmag.2017.081.107.

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ABSTRACTThe Penouta Sn-Ta deposit, in the northwest of Spain, is a greisenized granitic cupola where Ta minerals occur mainly as disseminations in a leucogranite body intruded in Precambrian–Lower Cambrian gneisses and mica-schists. This leucogranite is a medium- to fine-grained inequigranular rock consisting mainly of quartz, albite, K-feldspar and muscovite. Accessory minerals are mainly of spessartine, zircon, cassiterite, Nb-Ta oxides, monazite, xenotime, native bismuth and pyrite. The alteration processes were mainly albitization, muscovitization and kaolinitization.This leucogranite is p

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Szentpéteri, Krisztián, Kathryn Cutts, Stijn Glorie, et al. "First in situ Lu–Hf garnet date for a lithium–caesium–tantalum (LCT) pegmatite from the Kietyönmäki Li deposit, Somero–Tammela pegmatite region, SW Finland." European Journal of Mineralogy 36, no. 3 (2024): 433–48. http://dx.doi.org/10.5194/ejm-36-433-2024.

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Abstract. The in situ Lu–Hf geochronology of garnet, apatite, fluorite, and carbonate minerals is a fast-developing novel analytical method. It provides an alternative technique for age dating of accessory minerals in lithium–caesium–tantalum (LCT) rare-element (RE) pegmatites where zircon is often metamict due to alteration or radiation damage. Currently most dates from Finnish LCT pegmatites are based on columbite-group minerals (CGMs), but their occurrence is restricted to mineralised zones within the pegmatites. Accessory minerals such as garnet and apatite are widespread in both mineralis

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Van der Velde, Steffen, and Enrico Partiti. "Curbing Supply-Chain Human Rights Violations Through Trade and Due Diligence. Possible WTO Concerns Raised by the EU Conflict Minerals Regulation." Journal of World Trade 51, Issue 6 (2017): 1043–68. http://dx.doi.org/10.54648/trad2017041.

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The recent adoption of the EU Regulation laying down supply chain due diligence obligations for Union importers of tin, tantalum and tungsten, their ores, and gold originating from conflictaffected and high-risk (CAHR) areas constitutes an important step to curb particularly heinous crimes connected to the so-called ‘conflict minerals’ supply chains. The EU measure is remarkable insofar it incorporates an international soft-law instrument, the Due Diligence Guidance for Responsible Supply Chain of Minerals from CAHR Areas, and makes it mandatory for EU importers. Importers are under a mandator

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Voland, Thomas, and Shona Daly. "The EU Regulation on Conflict Minerals: The Way Out of a Vicious Cycle?" Journal of World Trade 52, Issue 1 (2018): 37–63. http://dx.doi.org/10.54648/trad2018003.

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In April 2017, the EU adopted a new EU Regulation introducing a compulsory due diligence scheme for the trade in conflict minerals. This regulation is the latest milestone in the process of tightening the supply chain requirements concerning tin, tungsten, tantalum and gold. The aim of this process is to encourage companies to respect human rights and avoid contributing to conflict through their mineral sourcing practices by cultivating transparent mineral supply chains and sustainable corporate engagement in the mineral sector. Measures already in place include the US Dodd-Frank Act and the O

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Guldris Leon, Lorena, and Magnus Bengtsson. "Selective Comminution Applied to Mineral Processing of a Tantalum Ore: A Technical, Economic Analysis." Minerals 12, no. 8 (2022): 1057. http://dx.doi.org/10.3390/min12081057.

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There is an increasing demand to simulate and optimize the performance and profit of comminution circuits, especially in low-grade ore processing, as is the case with critical metals minerals. Recent research has shown that the optimization result is greatly influenced by quality aspects of the products, such as cost, profit, and capacity. This paper presents a novel approach to performing a multi-objective technical and economic analysis of tantalum ore processing to increase the production of critical metals minerals. The article starts with mineral composition analysis to highlight the pote

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Alfonso, Pura, Sarbast Ahmad Hamid, Hernan Anticoi, et al. "Liberation Characteristics of Ta–Sn Ores from Penouta, NW Spain." Minerals 10, no. 6 (2020): 509. http://dx.doi.org/10.3390/min10060509.

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The strategic importance of tantalum and its scarcity in Europe makes its recovery from low grade deposits and tailings interesting. In Penouta, the contents of Ta and Sn in old tailings from an Sn mine are of economic interest. Due to the relatively low grade of Ta of around 100 ppm, a detailed study of the mineralogy and liberation conditions is necessary. In this study, the mineralogy and the liberation characteristics of Sn and Ta ores of the Penouta tailings were investigated and compared with the current leucogranite outcropping ores. The characterization was conducted through X-ray diff

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Guldris Leon, Lorena, K. Johan Hogmalm, and Magnus Bengtsson. "Understanding Mineral Liberation during Crushing Using Grade-by-Size Analysis—A Case Study of the Penuota Sn-Ta Mineralization, Spain." Minerals 10, no. 2 (2020): 164. http://dx.doi.org/10.3390/min10020164.

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Coarse comminution test-work and modeling are powerful tools in the design and optimization of mineral processing plants and provide information on energy consumption. Additional information on mineral liberation characteristics can be used for assessing the potential of pre-concentration stages or screens in the plant design. In ores of high-value metals (e.g., Ta, W), standard techniques—such as the mineralogical quantification of grain mounts by quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN) or chemical analysis by X-ray fluorescence (XRF) can be challenging,

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