chromium ore deposits

Chromite mining - The Oregon Encyclopedia

Most deposits of chromite in Oregon have been found near Grants Pass on the Siskiyou National Forest and near John Day on the Malheur National Forest. Domestic mining for chromite was restricted to a few locations in the United States, including Montana, California, and Oregon, and mining the mineral was only economically feasible during times of political conflict.

Chromium Ore - Cargo Handbook - the world's largest cargo ...

Chromite is important because it is the only economic ore of chromium, an essential element for a wide variety of metal, chemical, and manufactured products. Many other minerals contain chromium, but none of them are found in deposits that can be economically mined to produce chromium.

Mineral Resource of the Month: Chromium - EARTH Magazine

Although chromium is a metal, it does not occur naturally in metallic form. 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.

Podiform Chromite Deposits—Database and Grade and Tonnage ...

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 …

Chromium Ore - an overview | ScienceDirect Topics

Chromite ores of certain deposits contain minerals of the platinum group (Ir, Ru, Pt, Pd, and Rh), especially in South Africa and Zimbabwe, often found as inclusions in chromite silicate matrix. The mineral and gangue components have different magnetic susceptibilities, which makes it possible to use various magnetic separation methods.

The Platinum Group Element Deposits of the Bushveld ...

The chromite ore itself is also currently sub-economic for chromium. The layer thickness and chromium-to-iron ratio are the two most important parameters in evaluating the economic potential of chromite deposits, and the chromitite layers of the Bushveld Complex generally decrease in this ratio upward, and are in the range 2.0 to 1.2 .

Chromium Ore Deposits - dommelmozaiek.nl

Chromium Ore Deposits. Deposits giorgio garuti university of modena and reggio emilia, italy keywords chromite, platinum-group elements, magmatic ore deposits, geotectonic setting contents 1.Platinum-group elements pge 2.Chromium and pge geochemistry in magmatic systems 3.Types and geotectonic setting of chromitepge magmatic.

Chromium Ore - an overview | ScienceDirect Topics

For example, chromites from certain ore deposits in Kazakhstan include chromium spinelides with a predominant content of (Mg, Fe)Cr 2 O 4, which contains some Al 3+ in octahedral sites. The structural formula of chromium spinelides might be expressed as …

(PDF) Characteristics of Chromite Deposits at North ...

serpentine, are characteristic of chromite ore deposits. Ribbon-shaped ore is closely re lated to massive ore, but it is richer in silicates and then forms links with mottled ores

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 ...

Chromium ore - SlideShare

14-06-2019· Chromite Ore Processing Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report.

Ore deposits related to mafic igneous - Weebly

Ore deposits related to mafic igneous rocks • Range from largest, most extensive igneous petrologic systems in the world (e.g., Bushveld Complex) down to moderate-sized bodies like carbonatites. • Magmatic segregation deposits: –formed in intrusive bodies –ore deposits formed during fractional crystallisation • Exceptions:

chromium ore deposits - slagerij-bezorgservice.nl

chromium ore. Large deposits of rich chromite ore are mostly remote from Russian ferroalloy plants. The use of high-quality imported chromium ore is associated. Chromium | Minerals Education Coalition. Description: Chromium (element #24, symbol Cr) is a hard, bluish metallic element.

Magmatic Ore Deposits - BU

Magmatic Ore Deposits: A number of processes that occur during cooling and crystallization of magmatic bodies can lead to the separation and concentration of minerals. 1-Pegmatites 2-Layered intrusions 3-Kimberlites Examples of Magmatic ore deposits: 1-Chromite deposits 2-Nickel ŒCopper deposits 3-Platinum group metal (PGM) deposits

chromite deposits overseas

Chromium ore deposits range in age from 3.5-billion year-old chromite in the Selukwe greenstone belt (Zimbabwe) to the ophiolite-hosted Miocene deposits of New Caledonia. They provide indications of the evolving earth's tectonic processes in oceanic and continental crust and mantle.Podiform orebodies are hosted in peridotites, mostly now ...

Oman Chromite

Copper ore is being mined in the northern Oman. The ore is processed into electrolytically refined copper cathodes for export. Gold and silver are produced as by-products for export. The Sultanate has also started mining chromite and exporting since early 80's. Geological and geophysical surveys have also revealed deposits of asbestos and ...

Extraction of Chromium from Chromite Ore

The different varieties of chromite ore present in the area are massive, banded and spotted, laminated and friable. The grain size of chromite varies between 0.25 and 4 mm, and the fineness of the grain increases from the bottom to the top layers. The cell dimension of chromite (8.23–8.32 Å) decreases with the increase of Al 2 O 3.

Extraction of Chromium from Chromite Ore

20-07-2017· Chromite Ore Processing. Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report.

Chromium ore: composition, deposits and application ...

Deposits of chrome ores exist in Eurasia, Africa, as well as South and North America. The largest reserves are possessed by South Africa, which accounts for more than 75% of the total explored volume of chromium. After it, Kazakhstan and Zimbabwe are the leaders in the amount of ore reserves, then the USA, India, Oman, Turkey.

Compositions and tectonic settings of chromite deposits ...

01-05-1994· Chromium ore deposits range in age from 3.5-billion year-old chromite in the Selukwe greenstone belt (Zimbabwe) to the ophiolite-hosted Miocene deposits of New Caledonia. They provide indications of the evolving earth's tectonic processes in oceanic and continental crust and mantle.Podiform orebodies are hosted in peridotites, mostly now regarded as the remains of obducted …

CHROMITE DEPOSITS OF THE EASTERN PART OF THE …

Chromium Products Corporation, on Little Rocky Creek, and a brief reconnaissance of the deposits on the west side of Still- water Canyon. Trenching on the Benbow claims by the Bureau of Mines made it possible to trace segments of a tabular body of chrome ore with an aggregate length of 5,660 feet in a distance of 9,000 feet along the strike.

Chromium Ore - Cargo Handbook - the world's largest cargo ...

Chromium ore is a natural mineral formation (lumpy, dark grey in colour) containing chromium in such compounds and concentrations as to make its commercial exploitation technically feasible and economically expedient. ... The chief deposits of chrome ores in the USSR are in the Urals at the Donskoe and Sarany deposits.

Chromium ores of the aganozerskoe deposit | SpringerLink

An ore sample with 29.8% Cr2O3, 20.6% SiO2, and 4% CaO is analyzed. The ore does not meet the requirements imposed on chromium raw materials for producing refractories and can be used in refractory mixtures only with certain limitations or should be dressed.

chromium deposits - sks-stucadoors.nl

chromium ore deposits - crusherasia.com. To chromium mining industry, the first step is crushing the chromium ore with chromium ore. Chromite deposits are mined by both underground and surface techniques. So the chromite needs to be moved to the hopper ...

Geological ore deposits - The Australian Museum

Geological ore deposits are of many different types and occur in all geological environments. ... Most of the world's nickel, chromium and platinum-group elements are derived from these deposits. The largest deposits of platinum-group elements and chromium come from the 2055 million year old Bushveld Complex of northern South Africa.

Chromium Ore Deposits

Chromium Ore Deposits. Chromium ore weighs 2.162 gram per cubic centimeter or 2 162 kilogram per cubic meter, i.E.Density of chromium ore is equal to 2 162 kgm.In imperial or us customary measurement system, the density is equal to 135 pound per …