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Stratiform Chromite Deposit Model - USGS

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. The chromite ore is located primarily in massive chromitite seams and, less abundantly, in disseminated chromite-bearing layers, both of which occur in the ultramafic section ...

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METALLIC ORE DEPOSITS OF MONTANA

pine-type" chromite deposits, and diff er from the stratiform chromite layers of the Stillwater Complex. Although they are dwarfed in tonnage by the deposits at Stillwater, the smaller bodies reportedly contain chromite of higher purity and grade. A mine near Sil-ver Star produced several thousand tons of Cr-concen-trate in WWII (Jackson, 1963).

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Chromite deposits near Seiad and McGuffy Creeks, Siskiyou ...

The chromite deposits described in this report are in northcentral Siskiyou County, Calif. They are in two long tabular masses of peridotite which lie end to end and trend northnorthwest across the valley of the Klamath River. The Seiad Creek-Red Butte mass extends 10 miles north of the river and the Hamburg-McGuffy Creek mass 8 miles south.

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(PDF) Stratiform chromite deposit model | Nadine Piatak ...

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 during rift-related events (Lee, 1996; Naslund and McBirney, 1996; Cawthorn and ...

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Ring of Fire (Northern Ontario) - Wikipedia

The Ring of Fire is the name given to a massive planned chromite mining and smelting development project in the mineral-rich James Bay Lowlands of Northern Ontario. The Ring of Fire development would impact nine First Nations, and potential developers are required to negotiate an Impact Benefit Agreement with these communities prior to development. The region is centred on McFaulds Lake, …

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Chromite | Chromium Ore, Properties, Uses and Occurrence

Chromite is a common constituent of peridotite rocks and the serpentines derived from them. One of the first minerals to separate from a cooling magma; large chromite ore deposits are thought to have been derived by such magmatic differentiation.

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Origin of podiform chromite deposits by magma mingling ...

Mar 30, 1998· Following chromite nucleation, advective transport would then carry the chromite-laden hybrid away from the contact into the centre of the blob, as depicted in Fig. 6, where chromite grains could then accumulate and coalesce and with time turn into a chromitite nodule. 7. Conclusions Podiform chromite deposits form by magma min gling.

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The giant chromite deposits at Kempirsai, Urals ...

The investigation of stable and radiogenic isotopes and of platinum-group (PGE) and rare earth elements (REE) in chromitites and associated ultramafic rocks of the Kempirsai Massif, southern Urals, gives strong evidence for a multistage formation of giant ophiolitic-podiform chromite deposits present in the southeastern part of the massif. The Kempirsai ophiolite massif is divided by a shear ...

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Stratiform chromite deposit model: Chapter E in Mineral ...

A new descriptive stratiform chromite deposit model was prepared which will provide a framework for understanding the characteristics of stratiform chromite deposits worldwide. Previous stratiform chromite deposit models developed by the U.S. Geological Survey (USGS) have been referred to as Bushveld chromium, because the Bushveld Complex in South Africa is the only stratified, mafic ...

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Chromite Deposits Along the Border Ranges Fault, Southern ...

CHROMITE DEPOSITS ALONG THE BORDER RANGES FAULT, SOUTHERN ALASKA (In Two Parts) 2. Mineralogy and Results of Beneficiation Tests By D. C. Dahlin,l D. E. Kirby,' and L. L. Brown2 ABSTRACT To identify and characterize potential domestic chromium resources, the Bureau of Mines investigated podiform chromite deposits along the

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Minerals | Special Issue : Chromite Deposits: Mineralogy ...

May 28, 2021· Exceptionally, some chromite deposits have become a major source of precious metals, among which Pt is the most outstanding resource. Since the sixties, seminal experimental works have demonstrated how the mineral chemistry of chrome spinel was a potential guide to the composition of the parental magma and, thereby, chromite deposits became ...

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CHROMITE DEPOSITS KENAI PENINSULA, ALASKA

CHROMITE DEPOSITS OF KENAI PENINSULA, ALASKA History and production Although the existence of chromite deposits at Claim Point L/ and Red Mountain has been known for at least 30 years, produc- tion has been restricted to two years1 output from a single ore body at Claim Point. Under the stimulus of war-time prices, ap-

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Chromite deposits in the ophiolite complex of Northern ...

In the ophiolite series of N. Oman numerous small and large elongated podiform chromite deposits occur within the peridotite complex at a certain level of 100–200 meters below the layered zone, which grades into the overlying gabbro complex. The chromite grains were corroded after their deposition; their composition shows a large variation in Cr/Al ratio and a small variation in Cr/Fe ratio ...

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CHROMITE DEPOSITS NEAR SAN LUIS OBISPO, SAN LUIS …

chromite deposits can be found in Logan's report on the chromite and manganese deposits of California.^/ Additional references to chromite in San Luis Obispo County are made in the California State Mineralogist's Reports 15, 21, and 31; the most recent report, No. 37, by Alien, describes the deposits as seen in 1937 and 1938. 5/ GEOLOGY

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Chromite Deposits - an overview | ScienceDirect Topics

Chromite. Chromium from ores of chromite is used to make essential stainless steel, tool steel, armor-piercing projectiles, and is used in other high-temperature applications. It is a strategic metal to the USA, because since 1961, the U.S has been 100 percent dependent upon other nations for chromium.

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Podiform chromite deposits - USGS Science Data Catalog

Subtype of podiform chromite deposit as determined by the grade and tonnage models. Textual values of no more than 15 characters. tectset Paleotectonic setting. Paleotectonic setting, a preliminary categorization of the deposit according to the tectonic setting in which the deposit formed, midocean ridge, off-ridge, or suprasubduction.

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The Spatial Distribution of Some Chromite Deposits in Iran ...

chromite deposits (Table 1), it seems that the chromite deposits of Iran could be categorized as late Proterozoic to recent (800-0 Ma) chromite type of Stowe [28]. According to Stowe [28], in these types of deposits, ophiolite-hosted podiform chromite deposits predo-minate, indicating plate tectonic settings similar to those of present times.

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MAGMATIC DEPOSITS - Earth Sci

Chromite deposits are the end product of the separation of solid phases (Cr-rich spinets, (Fe, Mg) (Al, Cr. Fe) 2O4) from a liquid and their accumulation into chromite-rich layers. The processes involved in the formation of chromite layers are fractional crystallization and gravity settling. Chromite crystallizes into mineral grains within the ...

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Genesis of chromite deposits by dynamic upgrading of Fe ± ...

Chromite deposits have traditionally been subdivided into stratiform (type I) and podiform (type II) types (e.g., Stowe, 1994).However, it has become clear that type I stratiform deposits can be subdivided (Prendergast, 2008) into those hosted by large, differentiated layered intrusions (periodically replenished magma chambers) (type IA), and small, less-differentiated magmatic conduits (flow ...

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Chromite deposits of the north-central Zambales Range ...

The Zambales Ultramafic Complex is of the alpine type in which lenticular or podiform deposits of chromite lie in peridotite or dunite, mostly near Contacts with gabbroic rocks. Layered structures, foliation, and lineation commonly are well developed and transect boundaries between major rock units, including chromite deposits, at any angle.

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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 ...

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Mafic Layered Intrusions -Chromite and Platinum PGE Deposits

Oct 18, 2015· PGE's and chrome deposits are usually associated with large mafic intrusives many of these are layered. The general rule is the bigger the intrusion the better you need the large intrusions to provide enough metal content to be concentrated into a worthwhile deposit. Platinum Element Group and chromite deposits form as thin but laterally ...

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Uses of Chromium | Supply, Demand, Production, Resources

Chromite, an oxide of iron, magnesium, aluminum, and chromium, is the only ore mineral of chromium. In nature, chromite deposits are generally of two major types: stratiform (layered) and podiform (pod shaped). Both types are associated with ultramafic igneous rocks. The world's largest stratiform chromite deposits are found in South Africa, in ...

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BLACKBIRD CHROMITE DEPOSIT - Noront Resources

The Blackbird chromite deposit was discovered in 2008 and will be the second mine in Noront's pipeline. It is one of a number of large tonnage, high-quality chromite discoveries in the Ring of Fire. It offers significant potential due to its size, grade and location (less than 1 km from Eagle's Nest). Deposit Geology & Mineralization.

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The Mineralogy and Chemistry of the Chromite Deposits of ...

about 1000 individual chromite deposits. The chromite pods are clustered in two locations: a) the Karsantı district to the north east, and b) the Gerdibi-Cataltepe district in the south west. The chromite ore bodies occur in both the harzburgite cumulate parts of the ophiolite. Two types of chromite mineralization have

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

Aug 15, 2012· Abstract. Chromite ((Mg, Fe ++)(Cr, Al, Fe +++) 2 O 4) 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.

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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 …

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Chromite Deposits Along the Border - Alaska

CHROMITE DEPOSITS ALONG THE BORDER RANGES FAULT, SOUTHERN ALASKA (In Two Parts) 1. Field Investigations and Descriptions of Chromite Deposits By Jeffrey Y. Foley 1 and James C. Barker2 NBSTRACT Chromite deposits along the Border Ranges Fault in southern Alaska were investigated by the Bureau of Mines.

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Chromite deposits in the northern Oman ophiolite ...

Chromite deposits in the northern Oman ophiolitic complex occur in three structural contexts, i.e., (1) at the base of the cumulate series, (2) in the top kilometer of the mantle sequence, and (3) in the deeper parts of the mantle. Types 1 and 2 are characterized by the diversity of interstitial silicates where in decreasing order of abundance olivine, clinopyroxene, orthopyroxene, plagioclase ...

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The Chromite Deposits of the Great Dyke — Rhodesia ...

Bichan, R. (1969), Chromite Seams in the Hartley Complex of the Great Dyke of Rhodesia. In: Magmatic Ore Deposits — A Symposium. (Wilson, H. D. B., ed.) Econ. Geol. Mon., 4, 95–113. [Two shorter and more compact accounts, with slightly different views of the origin of the deposits…

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Big Daddy Deposit - Noront Resources

The Big Daddy chromite deposit is located 5 km northeast of Eagle's Nest. In 2006, hole FW-06-03 intersected two narrow bands of massive chromite in what would later become the Big Daddy deposit. This intersection was the first known chromite mineralization to be discovered in the Ring of Fire.

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Ophiolite Chromite Deposits as a New Source for the ...

Chromite sands from ophiolite chromite deposits, normally used for the metallurgical-grade chromite market, were tested as an alternative starting raw material to produce chromite foundry sands. The study of the silicate impurities assemblage showed that its mineralogy strongly affects the result of the most crucial parameter, the Acid Demand.

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Chromite - an overview | ScienceDirect Topics

Chromite. Chromite is an oxide mineral belonging to the spinel group, a complex mineral containing magnesium, iron, aluminum, and Cr in varying proportions, depending on the deposit, that can be represented as FeCr2O4 or (Fe2+,Mg)[Cr,Al,Fe3+]2O4 (Murthy et al., 2011; Sanchez-Segado et …

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