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W-Nb-Ta oxides as markers of the magmatic to hydrothermal transition condition in rare-metal granites
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
C. Marignac, M. Belkasmi, Y. Chalal, M. Kesraoui
In the microgranite dykes, while the micas in the matrix contain the same micro-assemblage of rare metal minerals as in the topaz-muscovite leucogranite, the miaroles are characterised by the crystallisation of cassiterite, Ta-rich (up to 3.07 % Ta2O5), together with minor wolframo-ixiolite and wolframite.
Process Applications and Challenges in Mineral Beneficiation and Recovery of Niobium from Ore Deposits – A Review
Published in Mineral Processing and Extractive Metallurgy Review, 2022
Nnaemeka Stanislaus Nzeh, Samson Adeosun, Abimbola Patricia Popoola, Abraham Adeleke, Daniel Okanigbe
Apart from the chemical composition of Nb minerals, their occurrences play very essential part in their process steps. Nb mineral deposits are classified according to the type/mode of occurrence and formation of the ore deposits such as: pegmatitic, magmatic, hydrothermal, alluvial/placer; and their different deposit complexes such as: carbonatites, granites, alkalic granites, and nepheline syenites (Parker and Fleischer 1968). These mineral deposits can also occur along with cassiterite, microlite, wodginite, wolframite, ixiolite, spodumene, tourmaline, beryl, feldspar, muscovite and quartz complexes (Knorring and Fadipe 1981; Wills and Napier-munn 2006; Bamalli, Moumouni and Chaanda 2011; Gibson, Kelebek and Aghamirian 2015; Finelib 2017; Berhe et al. 2017; Mindat 2020; Wang and Sutulov 2020; Parnell et al. 2021). Basically, columbite and pyrochlore group of Nb minerals are naturally occurring solid minerals that can be efficiently extracted from two main classifications of deposits, namely: the pegmatites and cabonatites (Bulatovic 2010; Gibson, Kelebek and Aghamirian 2015; Mackay and Simandl 2014; Perrault and Manker 1981).
Evaluation of mining and mineral processing methods’ impact on tantalite concentrate in Kenticha open pit mine, southern Ethiopia
Published in Applied Earth Science, 2020
Weldegebrial Haile, Bheemalingeswara Konka, Zerihun Desta
Tantalite deposit at Kenticha was discovered in the 1980s during Ethiopia-Soviet joint exploration programme. The host granitic pegmatite, 2 km long and 400–700 m wide, has intruded N–S trending serpentinite and talc-chlorite schist. Kenticha granite pegmatite field comprised of quartz, spodumene pegmatite, muscovite pegmatite, blocky microcline and muscovite-albite granite, biotite granite, two-mica granite and alaskitic granite (Tadesse et al. 2003; Mohammedyasin 2017). The mineralization is complex type and the commercial concentrations of Ta, Nb, Hf, Zr, REE, U and Th are related to Be, Li, Cs, Rb- bearing zones of the pegmatite (Tadesse 2001). The pegmatite is internally zoned and is subdivided into lower quartz-muscovite-albite granite, intermediate muscovite-quartz-albite-microcline pegmatite, and upper spodumene-quartz-albite pegmatite, based on their mineral assemblage (Küster et al. 2009; Kim et al. 2013). Kenticha deposit is Mn-rich columbite-tantalite type and similar to the deposits of Alto Ligonha Province (Mozambique), the ANS (Egypt) and Tantalite Valley pegmatites (southern Namibia). Kenticha pegmatite also hosts a continuous suite of columbite group minerals from Fe-rich to Mn-rich columbite and Mn-rich tantalite, with rare ixiolite, tapiolite, Ta-bearing rutile and cassiterite (Melcher et al. 2017). Kenticha pegmatite is LCT-type, exhibits U-Pb ages of 530±4 Ma and characterized by the presence of muscovite, garnet, tourmaline, tantalite and aluminosilicates (Zerihun et al. 1995; Tadesse and Zerihun 1996; Černý and Ercit 2005; Küster et al. 2009; Mackay and Simandl 2014).