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Mineral resource of the month: Chromium | U.S. Geological Survey

Chromium can be found in many minerals, but the only economically significant chromium-bearing mineral is chromite. Chromite has been mined from four different deposit types: stratiform chromite, podiform chromite, placer chromite, and laterite deposits.

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Podiform chromite deposits--database and grade and …

We have identified 1,124 individual podiform chromite deposits, based on a 100-meter spatial rule, and have compiled them in a database. Of these, 619 deposits have been used to create …

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A review of the deposits and beneficiation of lower …

This paper reviews the ~ajor deposits of lower-grade chromite in the world, and a wide variety of methods used for the recovery of ch.romlum f~om them. Ga~gue materials in more coarsely sized ores can be separated by gravity ~ean~, whereas flotation techniques are required for finer-grained materials. However, unless there is considerable

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Mineral resource of the month: Chromium | U.S. Geological …

Chromium can be found in many minerals, but the only economically significant chromium-bearing mineral is chromite. Chromite has been mined from four different deposit …

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World map showing the distribution of podiform chromite deposits …

The important world-class stratiform deposits include the Bushveld Complex (South Africa), the Great Dyke (Zimbabwe), the Stillwater Complex (United States), and the Kemi deposit (Finland).

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Podiform Chromite Deposits—Database and Grade and Tonnage Models

U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey

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Chromite deposits of the north-central Zambales Range, …

The United States imports 80 to 90 percent of its refractory-grade chromite from the Philippines, and its basic refractory technology has been designed upon the chemical and physical characteristics of Coto high-alumina chromite ore. ... The Zambales Ultramafic Complex is of the alpine type in which lenticular or podiform deposits of chromite ...

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Table 5: Grades and ratios for chromite concentrate …

Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). Gravity separation techniques are very suitable for beneficiation...

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Chromite and other mineral deposits in serpentine rocks of …

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. Between 1820 and 1850, additional deposits were discovered and mined in Maryland and Pennsylvania, including the ...

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Geological and Geophysical Studies of Chromite …

Types of chromite deposits _____ 26 Structure of chromite deposits _____ 28 References cited _____ 34 ILLUSTRATIONS Page FIGURE 2. Photograph showing cumulate textures in chromitiferous dunite._ 11 3. Rose diagram of steep faults cutting the ophiolitic rocks and surrounding rocks _____ 14 ...

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Comparison of physical properties of oxidative sintered …

The BIC holds three quarters of the world's viable chromite ore deposits [2], and has an aerial extent of 65000 km 2 with thickness of about 7 to 8 km [3]. The BIC consist of western, eastern and ...

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Diversities of chromite mineralization induced by …

Here we show elemental and Os isotopic compositions of different chromitites from the Zambales ophiolite, Philippines. Combined with data from ophiolites worldwide, high-Al …

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Geological features and origin of the chromite deposits …

Fig. 3. Crudely banded chromite ore in grade 2 quarry (Q2), east of Tata's camp. White bands are altered silicate or serpentine and darker bands are chromite disseminations Fig. 4. Spotted or antiorbicular chromite ore in grade 2 quarry (Q2), east of Tata's camp. White rounded dots are serpentine or talc in the

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Chromium (Cr) Ore | Minerals, Formation, …

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 …

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Chromite Deposits: Mineralogy, Petrology and Genesis

Magmatic chromite deposits (chromitites) are the main source of chromium for industrial use, and, in some cases, they may carry variable amounts of accessory metals (Ni, Cu, Au, and platinum-group elements) which may have a great economic interest as byproduct of chromium extraction.

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Podiform Chromite Deposits—Database and Grade and …

chromite deposits are found in dunite or peridotite near the contact of the cumulate and tectonite zones in ophiolites. We have identified 1,124 individual podiform chromite deposits, based on a 100-meter spatial rule, and have compiled them in a database. Of these, 619 deposits have been used to create three

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Descriptive & Grade-Tonnage Model of Podiform …

DEPOSITS Name Country Abdasht I RAN Akarca TRKY Akcabuk TRKY Akkoya TRKY Alice Louise NCAL Alpha NCAL Altindag TRKY Amores CUBA Andizlik TRKY Anna Madeleine NCAL Asagi Zorkum TRKY Aventura CUBA Avsar TRKY 38 based on reported analyses of samples from the deposits. chromite grade (r = 0.76, n = 12) and iridium grade (r = 0.71, n

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Podiform chromite deposits; database and grade and …

grade chromite deposits in the major podiform chromite sub- type tend to be richer in iron and refractory poor. Among the PGE, Rh is positively correlated with Ir and

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GOVERNMENT OF INDIA

5.2 Indian Chromite Deposits 5.3 Exploration Agencies 5.4 Prospecting & exploration 5.5 Chromite Deposits 5.6 Prospecting Guidelines for Chromite Deposits 5.7 Methods ... 8.5 Specification and Grade of Chromite Ore (38 – 55% Cr 2 O 3) 8.6 References PRODUCTION & CONSUMPTION OF CHROMITE 9.0 Introduction 9.1 Observations 9.2 Conclusions

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Geological features and origin of the chromite deposits of …

The chromiferous ultramafic rocks of Sukinda Valley (21°0'–21°5'N:85°43'–86°0'E) of Orissa are intrusive into the Iron-Ore Supergroup (2,950–3,200 Ma) at the eastern periphery of the Indian Precambrian shield. Both laterally and vertically, chromite occurs as persistent layers, lenses or pockets in the serpentinized and silicified dunite-peridotite extending over a strike length of ...

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Podiform chromite deposits; database and grade …

grade chromite deposits in the major podiform chromite sub- type tend to be richer in iron and refractory poor. Among the PGE, Rh is positively correlated with Ir and

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Diversities of chromite mineralization induced by …

Here we show elemental and Os isotopic compositions of different chromitites from the Zambales ophiolite, Philippines. Combined with data from ophiolites worldwide, high-Al and high-Cr...

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World map showing the distribution of podiform …

World map showing the distribution of podiform chromite deposits (green dots) used in this study. Country outlines shown for reference. ... and grade data are revised here using a sepa-...

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Chromite Deposits: Mineralogy, Petrology and …

Magmatic chromite deposits (chromitites) are the main source of chromium for industrial use, and, in some cases, they may carry variable amounts of accessory metals (Ni, Cu, Au, and platinum-group elements) which may …

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Stratiform Chromite Deposit Model

Stratiform chromite deposits are expressed as massive chromitite (greater than 90 percent chromite) bodies or seams of disseminated chromite in large, unmetamorphosed, repetitively …

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Stratiform Chromite Deposit Model

Stratiform chromite deposits are expressed as massive chromitite (greater than 90 percent chromite) bodies or seams of disseminated chromite in large, unmetamorphosed, repetitively layered mafic-ultramafic intrusions that were emplaced in stable cratonic settings or …

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CHAPTER 5 CHROMITE DEPOSITS

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.

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Table 5: Grades and ratios for chromite …

Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). Gravity separation techniques are very suitable for beneficiation...

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(PDF) Mineralogical Evaluation of Chromite at Nkomati …

The Cr/Fe ratio can thus be used as a proxy for the quality of chromite ore [22]. The lower grade deposits, with low Cr/Fe ratios (i.e., high iron content and low Cr2 O3 content) were as a result not mined. These low-grade deposits have however, been exploited and successfully upgraded using physical methods such as gravity separation [1,4]. ...

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World map showing the distribution of podiform chromite deposits …

World map showing the distribution of podiform chromite deposits (green dots) used in this study. Country outlines shown for reference. ... and grade data are revised here using a sepa-...