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Chromite is a critical mineral that is of great significance for the development of metallurgical, chemical, and other industries. In order to study the deep ore prospecting methods of ophiolite-type chromitite, we have carried out plane-profile geological and mineral surveys, as well as high-precision gravity, magnetic, and controlled source audio …
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This study presents a complete trace element data set of chromite from the world's largest podiform chromite deposit at Kempirsai, Kazakhstan, together with platinum group element (PGE) and Re-Os isotope compositions, to explore the potential of trace elements in the study of podiform chromite deposits.
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Chromite and Bauxite ores obtained from National Steel Raw-material Research & Exploration Agency (NSREA) and Raw Material Research and Development Council (RMRDC) respectively were dissolved by ...
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Africa is the world's most mineral-rich continent endowed with abundant metallic and non-metallic minerals and gemstones. Africa's mineral wealth is attributable to its "favorable" geology and multiple tectonic events that affected the Precambrian rocks known worldwide to contain the bulk of many of the world's valuable mineral deposits.
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Chromite deposits constitute the only primary source of chromium metal; in addition they record a remarkable phenomenon in the overall process of concentration by magmatic crystallization. Extensive literature exists on both aspects of chromite deposits. The readers are particularly referred to the review articles by Duke (1983) and
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Mineral belts in Nigeria are divided into the Pan African mineral belts and the Mesozoic to Cenozoic belts. The Pan African Mineralisation belts include the Gold schist belts, the Chromite belt and the Sn-Ta Pegmatite belt all in the Western Province of the Nigerian Basement Complex. The Mesozoic-Cenozoic belts
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The Hongshishan chromitite deposits are situated to the north of the Beishan orogenic collage, in the southern part of the Central Asian Orogenic Belt. ... Cr 2 O 3 and Cr #-Mg # variation of chromite-cores and chromites fall within the field of the mid-ocean ridge and ophiolitic podiform chromite settings. The (187 Os/ 188 Os) i ratios of …
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The Koh Safi Chromite Ore Deposit is located in Afghanistan's northern–northeastern end of the Kabul–Kandahar ophiolite zone. Sedimentary formations, delayed volcanic, and ultramafic rock groups, including peridotites and serpentinites, could all have been found in the Koh Safi area, where structural discontinuities with the two …
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A fundamental problem in the genesis of all stratiform chromite deposits is how layers of massive to semi-massive chromite that are commonly up to 1 m thick (e.g., Bushveld [South Africa], Stillwater [Montana, USA]), less commonly up to 10 m thick (e.g., Inyala and Railway Block [Zimbabwe], Ipueira-Medrado [Brazil], Uitkomst [South Africa], …
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deposits of chromite are in and near streams that drain areas underlain by serpentine. A group of unusual minerals, among them kammererite, are typical associates of high-grade massive chromite but are rare in lower grade deposits. Chromite was first discovered in the United States at Bare Hills, Md., around 1810.
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Africa hosts about 30% of the Earth's mineral resources and ranks first or second in the quantity of world reserves of platinum, chromite, diamond, bauxite, cobalt, manganese, zirconium and...
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Chromite is an accessory phase always present within these lithologies. Small chromite deposits, exploited in the past, can be found in different localities in the complex. The contact between chromitites and their host lithologies (variably altered dunites and/or clinopyroxenites), when visible, is always sharp (Christodoulou 1980).
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Platinum (Pt) is a rare and valuable metal that is widely used in various industrial applications due to its unique properties. Platinum ore refers to the naturally occurring rocks or minerals that contain significant concentrations of platinum, usually in the form of platinum group minerals (PGMs) and associated minerals. Platinum ore is …
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Melt-rock interaction is a popular interpretation for the origin of podiform chromite deposits, but the actual mechanism in this model for chromite enrichment remains unclear. It remains the ...
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In the foreign scene, $12 and $56 are the ranges of the prices of limestone coming from Nigeria. Nigeria market shares in limestone. Exports . Nigeria ranks 86th in limestone market shares in global exports. They make $ …
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Chromite deposits in the study area are of podiform-type. Chromite is massive and brecciated. Based on the content of Cr # = Cr/(Cr + Fe ³⁺ ) of the chromite, comprised between 0.61 and 0.74 ...
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It is added in form of ferro-chromium, which is presently imported from Russia and Germany to meet the need of Nigerian Steel Industry. Chromite ore (FeOCr 2 O 3) is the most important mineral occurrence of chromium, and some deposits are reported in Anka Local Government Area of Zamfara State.
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Small occurrences are known of chromite, asbestos, Cu Ni sulphides, manganese and a variety of industrial minerals including talc, kyanite and magnesite. ... However this type of mineralization is mar- kedly absent in the Upper Proterozoic metasedi- ments of Nigeria. Basemetal deposits in the Arabian Nubian Shield of late Proterozoic …
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Tin and tantalite deposits in Nigeria are associated with Pan-African granitic pegmatites. The Trans-Sahara Metacraton (Fig. 1) is a large disjointed mass of mostly reworked basement rocks that underlies most of the Sahara and northeast Africa extending into parts of Algeria and Egypt. ... Chromite reserves in South Africa are estimated at 295 ...
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Chromite reserves in South Africa are estimated at 295 Mt which represents 42% of global reserves. Chromite deposits in Africa occur …
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is rich in oil and gas (Nigeria, Gabon, Algeria), bitumen (Nigeria), and coal (South Africa). The value of mineral wealth that has been exploited in Africa in the past 100 years is estimated at ...
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chromite deposits crystallized from a magma similar to that from which the basal cumulates formed (A1203, 15.1-16.1 wt%; FeO/MgO, 0.55-0.60). The type-3 chro- mites were derived from a magma of ...
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Other occurrences had been reported at Hamissanasol Hamed in the northern Red Sea Hills, the Nuba Mountains in southern Kordofan, JabalRahib northwest Sudan and Jabal El Tawil in central Butana. …
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Peridotite and gabbro form an intrusive complex which is exposed over an area about 35 km wide and 150 km long in the center of the Zambales Range of western Luzon. The Zambales Complex is remarkable for its total known resources, mined and still remaining, of about 15 million metric tons of chromite ore. Twenty percent of Free World production …
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The morphological and chemical composition of chromite in the partially-serpentinized harzburgite and oxide zone of two laterite profiles at the Goro lateritic nickel deposit, New Caledonia, were investigated to: (1) establish the melt conditions at the mantle-crust boundary during ophiolite formation, and (2) characterize the weathering of …
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Chromite mineralization is associated with some of the ... Metallogenetic types found in other Pan-African terrains that are markedly absent in Nigeria include basemetal deposits of plate ...
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The principle metallogenetic types that are (or have been) exploited are iron deposits, gold vein mineralization and Sn Ta Nb-bearing pegmatites. Small occurrences …
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Chromite (Cr) occurs exclusively in mafic and ultramafic igneous rocks (Papp and Lipin, 2006).Although some Cr-based minerals such as crocoite (PbCrO 4), vauquelinite (Pb 2 Cu[CrO 4][PO 4]), uvarovite (Ca 3 Cr 2 [SiO 4] 3), and merumite (4(Cr,Al) 2 O 3 ·3H 2 O) are well known, chromite (FeCr 2 O 4) is the only one that is a commercially …
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Chromium (Cr) ore refers to a natural mineral deposit that contains chromium in its raw form. Chromium is a chemical element with the symbol Cr and atomic number 24. It is a hard, lustrous, and corrosion-resistant metal that is widely used in various industrial applications due to its unique properties.
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Origin of podiform chromite deposits. The origin of podiform chromite deposits has long been a matter of debate. They are generally thought to have formed in the upper mantle by melt/rock interaction in SSZ environments (Zhou and Robinson, 1997, Ballhaus, 1998, Melcher et al., 1999, Buchl et al., 2004, Rollinson and Adetunji, 2013). …
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