Chromite: The only mineral ore of chromium metal

Stratiform, Podiform, and Beach Sands. Small amounts of chromite are found in many types of rock. However, chromite deposits that are large enough for mining are generally found in: 1) stratiform deposits (large masses of igneous rock such as norite or peridotite that slowly crystallized from subsurface magma); 2) podiform deposits (serpentines and …

Genesis of chromite deposits by dynamic upgrading of Fe …

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], Sukinda …

ORE DEPOSITS OF NIGERIA: DISTRIBUTION AND …

Ores of iron, tin-niobium-tantalum deposits, and precious metals in the Nigerian basement complex are predominantly associated with the metasediments (gneisses and schists). Associated with the older …

Chromite Composition and Platinum-Group Elements …

This study provides a comprehensive literature review of the distribution, the platinum- group elements (PGE) composition, and mineral chemistry of chromitites associated with Mesozoic Tethyan ophiolites in the Mediterranean Basin. These suites outcrop in the northern Italian Apennines, the Balkans, Turkey, and Cyprus. Most …

Formation and Evolution of Chromitites in the Hongshishan …

The restricted ranges of Al 2 O 3, 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 the chromitites are in the range of 0.12449–0.12745 (average 0.12637) and the γ Os are from –1.92 to –0.06 (average ...

ORE DEPOSITS OF NIGERIA: DISTRIBUTION AND TYPES

This paper examines the types of ore deposits in Nigeria. Ores of iron, tin-niobium-tantalum deposits, and precious metals in the Nigerian basement complex are predominantly associated with ... Currently, Africa is a world leader in the production of several high-value metals including gold, platinum, chromite, uranium, manganese, …

Platinum-Group Element Abundance in Chromite Deposits …

Whole rock platinum-group element (PGE) analyses of 36 stratigraphically controlled chromitite samples from the peridotite unit of the Acoje ophiolite sequence reveal the following: (a) Chromitites occurring within harzburgite of the mantle section (Group I chromitites) have abundances ranging from < 20 to 120 Ir, < 100 to 150 Ru, 0·7 to 17·8 …

Platinum-group element (PGE) deposits and occurrences: …

Empirical evidence supports theoretical considerations that chromite and magnetite precipitation may be particularly conducive to trigger sulfide melt saturation, due to a pronounced decrease in FeO content of the magma. ... Deposits containing Ni, Cu and platinum-group elements (PGE) are usually associated with mafic and ultramafic rocks. …

An overview of the platinum-group element nanoparticles in …

Ir-Pt mineral nanoparticles in base-metal sulfides of the Caridad chromite deposit (Eastern Cuba): effects of seafloor metamorphism. The Caridad chromite deposit is one of the ten Cr-rich chromite ore bodies being mined for Cr in the small mining district of Sagua de Tánamo in Cuba (González-Jiménez et al., 2011).

Chromite chemistry of a massive chromitite seam in the …

The Bushveld Igneous Complex (BIC) is known for its laterally extensive platinum group element–bearing layers, the most famous being the Merensky Reef and the UG-2 chromitite in the eastern and western limbs of the complex. In the northern limb, the Platreef mineralization and a thick chromitite seam below it (referred to as the "UG-2 …

Stratiform Chromite Deposit Model

Stratiform chromite deposits are found throughout the world, but the chromitite seams of the Bushveld Complex, South Africa, are the largest and most intensely researched. ... (orthopyroxene and clinopyroxene), plagioclase, sulfides (pyrite, chalcopyrite, pyrrhotite, pentlandite, bornite), platinum group metals (mainly laurite, cooperite ...

Nigeria's mineral resources in the context of Africa's mineral wealth

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Overview of Nigeria's Mineral Resources in the Context of …

WEBCurrently, Africa is a world leader in the production of several high-value metals including gold, platinum, chromite, uranium, manganese, vanadium, tantalum …

Origin and depositional history of platinum-group minerals …

Although the chromitites are small, the abundance of platinum can be quite high. For example, at the Krutoy Log deposit, chromite-platinum ore at the top of the orebody extended for a distance of 2 m in one adit. From this small volume of rock, about 30 kg (reported as 965 troy ounces) of native platinum metals was recovered (Mertie, …

Chromitite

The Indo-Burman Ranges and the Arakan Coastal Lowland. Andrew Mitchell, in Geological Belts, Plate Boundaries, and Mineral Deposits in Myanmar, 2018. 8.2 Webula Taung Chromite Occurrences and Copper–Nickel Anomalies. Chromitite occurrences in the 120 km 2 ultramafic body at Webula Taung (Fig. 11.6), the largest ultramafic body in the Indo …

Chromium (Cr) Ore | Minerals, Formation, Deposits

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.

Geology of the PGE Deposits in the Bushveld …

The PGE resources in the BC are such that even after 100 years of mining, 6.8 billion ounces of Platinum remain. At current rates of extraction, the complex will not be mined out for the next 700 years. ...

Mineral Deposits and Exploration Potential of …

This book furnishes a detailed description of the deposits of metallic, non-metallic, solid energy, gemstones and industrial minerals in Nigeria with …

(PDF) Nigeria's mineral resources in the context of …

These intrusive complexes are the sole sources of platinum and chromite. (d) Nigeria's sedimentary basins basin, contain relatively thin (<5000 m) sequence of sediments that are not thick enough to accumulate large …

Overview of Nigeria's Mineral Resources in the Context …

Africa ranks first or second in the quantity of world reserves of platinum, gold, diamond, manganese, chromite, cobalt, vanadium, zirconium and phosphate rock, while it is a …

Platinum-group element-chromitite associations in the …

New and recently published platinum-group element data of chromite-rich layers in the Bushveld Complex are evaluated. Chondrite-normalized platinum-group element plots of …

Chromite

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 …

Chromitite layers indicate the existence of large, long-lived, …

Field and textural evidence for in situ growth of chromite. The nature of intrusion-wide chromite-forming processes can be constrained from field and textural features of massive chromitite layers ...

Platinum-group element (PGE) deposits and occurrences: …

Empirical evidence supports theoretical considerations that chromite and magnetite precipitation may be particularly conducive to trigger sulfide melt saturation, …

Platinum : Properties, Uses, Occurrence and Localities

These complexes can contain platinum-bearing ore deposits, particularly in association with chromite ores. Alluvial Deposits: In some cases, platinum is eroded from primary sources like layered intrusions and transported by rivers and streams. Over time, it can accumulate in alluvial deposits, often alongside other heavy minerals such as gold.

Indian ore deposits: current genetic understandings

This article reviews all the contributions made on genetic aspects of various Indian metallic ore deposits between the period 2020 and 2023. We cover ores of chromite, platinum group elements, gold, uranium-copper ores of Iron Oxide Copper Gold (IOCG) affiliation, rare earth metals (+ niobium + tantalum + yttrium), and lithium …

Mafic Layered Intrusions -Chromite and Platinum PGE Deposits

Another major groups of deposits in the mafic layered complexes are platinum group elements and chrome deposits but unlike copper nickel massive sulfides they don't form as puddles on the floor of the intrusions they form in discrete layers well up in the magma chamber. The PGE's that's platinum palladium, rhodium with less …

Podiform chromite deposits--database and grade and …

Chromite ((Mg, Fe++)(Cr, Al, Fe+++)2O4) is the only source for the metallic element chromium, which is used in the metallurgical, chemical, and refractory industries. Podiform chromite deposits are small magmatic chromite bodies formed in the ultramafic section of an ophiolite complex in the oceanic crust. These deposits have been found in …

Origin and depositional history of platinum-group minerals …

The present work reviews assemblages of detrital platinum-group minerals (PGM) in placers worldwide with the aim of identifying common and distinctive features …

Solid Mineral Deposits and Mining in Nigeria:

Currently, Africa is a world leader in the production of several high-value metals including gold, platinum, chromite, uranium, manganese, vanadium, tantalum and cobalt and industrial minerals phosphate, zirconium, vermiculite and gemstones. it is estimated that Africa is the repository of about 75% of the planet's total resources that remain ...