- Mon - Sat 8:00 - 18:00
- [email protected]
- 0086-21-58386256
Chromite Deposits Along the Border Ranges Fault, Southern Alaska (In Two Parts) 1. Field Investigations and Descriptions of Chromite Deposits ... roads and all deposits containing only chemical- or refractory-grade chromite, about 2,200,000 tons of Cr203 are contained in 41 hard-rock deposits. A placer deposit contains an additional 556,000 tons.
comment (deposit): chromite deposits alined in 3 mian ore-bearing zones, which strike n40w. in 1942, lowgrade ore was exposed to a depth of 4 ft. ... comment (development): b. newman leased 2000 acres of the meeker ranch in 1942 in order to clean out old chromite workings and develop low grade ore. references. reference (deposit): logan, c.a ...
chromite are located in Odisha, mostly in Jajpur, Kendujhar and Dhenkanal districts. Minor deposits are scattered over Manipur, Nagaland, Karnataka, Jharkhand, Maharashtra, Tamil Nadu, elangana and Andhra Pradesh. Gradewise, Charge chrome grade accounts for 31% resources followed by Beneficiable grade (25%), Ferrochrome grade (18%) and Refractory
The chromite deposits in the ultramafic tectonites of the Dinagat Ophiolite Suite generally occur as massive, irregular-shaped and podiform bodies, as alternating banded masses within a 5 …
Of these, 619 deposits have been used to create three new grade and tonnage models for podiform chromite deposits. The major podiform chromite model has a median tonnage of 11,000 metric tons and a mean grade of 45 percent Cr 2 O 3. The minor podiform chromite model has a median tonnage of 100 metric tons and a mean grade of 43 percent Cr 2 O 3.
potential of chromite deposits depends mainly on the thickness, continuity, and grade of ore. The most important uses of chromium are in stainless steels, nonferrous alloys, and chromium plating. Chemical-grade chromium is widely used in chemicals and pigments. Chromium also is an important component in refractories. Many of the major ...
Podiform Chromite Deposits, Database and Grade and Tonnage Models: Usgs Scientific Investigations Report 2012-5157 (Paperback) by Dan L. Mosier, Donald A. Singer, Et Al. [Creator] Paperback, 58 Pages, Published 2013: ISBN-10: 1-288-85141-3 / 1288851413 ISBN-13: 978-1-288-85141-6 / 9781288851416:
Chromium ore deposits can vary in size and grade, with some deposits containing high-grade chromite ore suitable for direct use in metallurgical processes, while others may require beneficiation to increase the …
Location and characteristics of 1,124 individual mineral deposits of this type, with grade and tonnage models for chromium as well as several related elements. Search Search. Mineral Resources; ... Subtype of podiform chromite deposit as …
Lenticular chromite deposits of widely varying age, metamorphic grade and strain rate, as well as size, shape, and ore quality, are widespread in greenschist to amphibolite grade greenstonegneiss terrain in the south-central part of the Zimbabwe craton and in granulite grade equivalents in the Northern Marginal zone of the Limpopo belt in the ...
Significant producers like Kempersai in the Southern Ural Mountains have large deposits of metallurgical-grade chromite. Podiform deposits, though small, were historically preferred over the vast reserves in stratiform deposits like the Bushveld Complex.
In contrast, ophiolite-related chromite deposits, although limited and dispersed, contain high-grade ores, leading to their extensive use in industries [2]. Unlike the global predominance of layered intrusion-related chromite deposits, China is dominated by ophiolite-related chromite deposits.
Figures refer to shipping-grade chromite ore, which is deposit quantity and grade normalized to 45% Cr2O3, except for the United States where the grade is normalized to 7% Cr2O3. Citation formats
Introduction. Chromite segregations, known as podiform chromite deposits or chromitites, form an integral part of the ultramafic mantle sequence of many ophiolite complexes, particularly where a basal tectonised harzburgite …
of chromite has resulted in such deposits being close to exhaus-tion. The present scenario requires utilization of the indige-nous low-grade chromite for the production of value-added chromium-based chemicals to replace their imports (R & D-PCSIR, 1988). The gravity concentration of low-grade chromite ore is uneco-
Of these, 619 deposits have been used to create three new grade and tonnage models for podiform chromite deposits. The major podiform chromite model has a median tonnage of 11,000 metric tons and a mean …
Most deposits contain a range of chromite grades, including: Metallurgical grade (high chromium chromite, minimum 40% Cr2O3) ... Chemical grade chromite is used in leather tanning, metal finishing, wood preservatives, light-stable and corrosion-inhibiting pigments, paints, coloured glass and ceramic glazes. ...
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 …
higher metamorphic grade. SEIAD CREEK CHROMITE DEPOSITS LOCAL GEOLOGY The Seiad Creek chromite deposits in the northwest quarter of the Seiad Valley quadrangle occur in two tabular ultramafic bodies, one a dunite, the other an harzburgite. The two bodies are ...
Chromite is the only mineral that is a commercial natural source of chrome. Chromite deposits are subdivided into podiform and stratiform (layered) types based on the geometry of the ore bodies ...
deposits derived by erosion of such rocks are low in grade and of very minor importance. Extensive nickel-chromium laterites occur in Cuba and Papua New Guinea, but so far there …
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 midoceanic ridge, off-ridge, …
Detailed gravity surveys were made in Camaguey Province, Cuba, as part of a systematic exploration program conducted by the U. S. Geological Survey on behalf of the General Services Administration to locate deposits of refractory-grade chromite. During the period August 4, 1954, to April 5, 1956, a total of 41,921 gravity stations were established in nine areas …
Chromite grades of podiform chromite deposits from California and Oregon, USA. Individual digits represent number of deposits. [Because of limitations on the reproduction of the original figure, these numbers cannot be distinguished in the figure.] Figure 23. PGE grades of podiform chromite deposits from California and Oregon, USA. A, Rhodium.
sible deposits of high-grade chromite have been worked out, and future production will be predominantly from low-grade concen trating ore containing from 15 to 30 percent of chromic oxide (CrgOj). The known reserve in the explored deposits is about
U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey
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 ...
In the Koh Safi area, structural discontinuities (mostly faults) trending from the northwest to southeast and east to west are primarily linked to high-grade chromite deposits (Fig. 1a). The slope of the serpentinite units and the chromite lenses within them is also toward the east to northeast, as is the slope of the structural units governing the serpentinites and the …
This paper reviews the major deposits of lower-grade chromite in the world, and a wide variety of methods used for the recovery of chromium from them. Gangue materials in more coarsely sized ores can be separated by gravity means, whereas flotation techniques are required for finer-grained materials. However, unless there is considerable iron in the ores, physical means …
CHROMITE DEPOSITS IN THE CENTRAL PART OF THE STILLWATER COMPLEX, MONTANA BY A. L. HOWLAND ABSTRACT The chromite deposits of the central part of the Stillwater complex lie in a belt 9 miles long between the valleys of Boulder River and the West Fork of the Stillwater River in Sweet Grass County, Mont. The chromite occurs as layers