columbite tantalite cassiterite

Tantalite is the tantalum-rich member, and Columbite is the niobium-rich member. Tantalite is named after its tantalum content, and, together with Columbite, are the most important minerals containing the rare element tantalum. The name Tantalite has been discredited by the IMA, with the more specific designations of Tantalite- (Fe) (also …

Columbite is the niobium-rich member, and Tantalite is the tantalum-rich member. Columbite is named after its niobium content, which was previous known as columbium prior to its renaming. Columbite is the most important mineral containing the rare element niobium and is its main ore. The name Columbite has been discredited by the IMA, with …

This mineralization consists of millimetersized cassiterite and columbite-tantalite minerals hosted within much less dense gangue minerals (mainly quartz, feldspars, and muscovite) (Dewaele et al ...

The deposits are intensively exploited for columbite-tantalite and cassiterite. Alkali metals in muscovite (Rb 370–7590 ppm, Cs 8–1470 ppm) are modeled by Rayleigh fractional crystallization ...

Spodumene occurs mainly in the shallow albite pegmatites (55–105 m depth), and disseminated beryl, columbite-tantalite, and cassiterite, mainly occur in pegmatites at depths less than 700 m.

The examples of igneous rocks are porphyry copper deposits in granite, platinum-palladium-chromium-nickel deposits in dunite, peridotite, gabbro, norite and anorthosite, tantalite, columbite, cassiterite in pegmatite. Ore deposits can exclusively be formed under sedimentation process like iron ore as Banded Iron Formation (BIF), and Banded ...

The columbite–tantalite samples selected for this pilot study come from three pegmatite locations in North America: (1) the Starrett pegmatite in southern Maine; (2) ... Mineral chemistry of cassiterite, columbite, tantalite and associated minerals from Soonkyoung tin-bearing pegmatite. J Korean Inst Mining Geol 22:327–339.

Columbite-tantalite and cassiterite as indicator minerals for lithium pegmatites: Implications from geospatial and mineralogical analyses of stream sediments in southeast Ireland. January...

Cassiterite, zircon and struverite inclusions in columbite–tantalite grains indicate a primary magmatic origin. However, the cross-cut character of struverite zoned microveinlets may also indicate crystallization of this Ta-rutile phase during the subsolidus event, while microlite crystallization appears to be exclusive post-magmatic.

SHRIMP 207 Pb/ 206 Pb dates from cassiterite and tantalite samples of the Strelley, Pilgangoora and Moolyella pegmatites are reported by Kinny (2000) ... Backscattered electron image of anhedral columbite-tantalite and sub-rounded zircon inclusions in Siffleete's Reward cassiterite. (f) Backscattered electron image of …

The pegmatites are mineralised with columbite-tantalite and cassiterite. Recent investigation by Dewaele et al. (2007a Dewaele et al. (, 2008 indicates that the columbite-tantalite mineralisation ...

Dissolution textures resulting from the corrosion of columbite and tantalite rims, in particular, are common. The Mn/(Mn + Fe) ratio varies between 0.33 and 0.97 and the …

The increased demand of metals such as tantalum (Ta) and niobium (Nb) reflect the on-going development in modern science, engineering and technology. The extraction of these two metals from columbite-tantalite ore is based on generic extractive metallurgy. However, the upstream purification of ore and downstream extraction of Ta …

Columbite–tantalite and ilmenite correlation is relatively poor because columbite–tantalite is a scarce mineral in the primary source. However, the correlation …

Coltan 139 and these three columbite-tantalite samples with variable compositions yielded internally consistent LA-ICP-MS U-Pb ages when using each other for calibration and the weighted mean 206 Pb/ 238 U ages are comparable to respective ID-TIMS ages. Composition-dependent U-Pb fractionation seems to be insignificant under …

Columbite-tantalite minerals are potentially useful for dating the emplacement age of economically important rare-element pegmatites. Romer and Wright have shown that columbite-tantalite may accommodate considerable amounts of uranium (circa 500–1000 ppm) and exclude lead almost completely.The U-Pb systematics, …

Coltan 139 and these three columbite-tantalite samples with variable compositions yielded internally consistent LA-ICP-MS U-Pb ages when using each other …

Rare accessory minerals in albite–spodumene pegmatites are microlite, Ta-bearing rutile, zircon, cassiterite and uraninite. ... (2011) and Aseri and Linnen (2011) showed that the solubilities of columbite-(Mn) and tantalite-(Mn) in nearly fluid-saturated granitic melts are independent of F concentration in these melts, Fiege et al. (2011, ...

Columbite-tantalite, cassiterite, unzoned pegmatites (Nb-Ta-Sn) All swarms Nainais: CGM, cassiterite, tourmaline, apatite, quartz, albite, muscovite: Metasediments: Unzoned but sometimes exhibit a quartz rich core. They vary in size from a meter to tens of meters in scale. Greisen zones contain CGM and cassiterite. The most common …

Hydrothermal origin of columbite-tantalite is observed in greisens, expressed by a higher W concentration and coeval or even younger crystallization …

Columbite-tantalite formed during the crystallisation of the pegmatites, followed by intense alkali metasomatism, i.e. widespread growth of albite and white mica. …

The age of apatite, cassiterite, columbite-tantalite (coltan) from five zones in Nanping No.31Li–Cs–Ta-rich type pegmatite deposit show remarkable two group …

Between 1929 and 1985, the Gatumba area has produced ∼17,600 tonnes of mixed cassiterite and columbite-tantalite concentrate, often called "coltan". This production mainly came from the exploitation of eluvial and alluvial deposits and …

Since 2006, our working group has been investigating columbite-tantalite (coltan) mineralisation, especially in Africa, also within the wider framework of establishing certified trade chains.

Columbite-tantalite and cassiterite mineralisation is associated with some of these pegmatites. Columbite-tantalite mineralisation in pegmatites in Burundi has been dated at 962 ± 2 Ma and 968 + 33/ 29 Ma (U–Pb dating columbite-tantalite grains; Romer and Lehmann, 1995). The granite–pegmatite systems are cut by quartz veins.

Found in columbite-tantalite (coltan) (Fig. 53.1 ), tantalite, and cassiterite (these minerals can have small amounts of thorium and uranium and emit radioactivity). …

Major progress has been made in the direct dating of metal-bearing phases (such as wolframite, cassiterite, columbite-tantalite or sulfides, notably molybdenite) in recent years, through both ...

The generic term columbotantalite, cbt, comprises the different compositional varieties of columbite and tantalite, classically treated (e.g. Ramdohr 1980) as an isomorphic, continuous solid solution series between the members (Fe, Mn)Nb 2 O 6 (niobite, now columbite, cb) and (Fe, Mn)Ta 2 O 6 (tantalite, tan), a series also known …

"Conflict minerals," as defined by the US legislation, currently include the metals tantalum, tin, tungsten and gold, which are the extracts of the minerals cassiterite, columbite …

For instance, tin, tantalite, columbite, zircon, ilmenite, and wolframite are buried in the bowels of Plateau, Nasarawa, Kaduna State, etc. This research aims at discussing the importance of cassiterite mining in Plateau and its benefit to Nigeria's economy The obtained results from an interactive session with artisanal miners at Bisichi ...

The ore minerals of albitites are Ta-Nb-bearing cassiterite, columbite–tantalite, struverite, and uranmicrolite. Thus, the Kester Deposit includes …

Columbite-tantalite and cassiterite mineralisation are associated with some of these pegmatites. The columbite-tantalite mineralisation has been dated in Burundi at 965 ± 5 Ma and 962 ± 2 Ma (Romer & Lehmann, 1995; Brinckmann et al., 2001), which overlaps with the timing of pegmatite emplacement. The entire set has been cut by quartz veins ...

Dissolution textures resulting from the corrosion of columbite and tantalite rims, in particular, are common. The Mn/(Mn + Fe) ratio varies between 0.33 and 0.97 and the Ta/(Ta + Nb) ratio between 0.07 and 0.93. Wodginite and microlite formed as late replacements of CGM and occur associated with tantalite and cassiterite.