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Podiform chromite deposits occur in peridotite and mafic complexes of alpine type, and are tabular, pencil-shaped, or irregular in form. In contrast with stratiform deposits, whose textures and structures reflect crystal settling and suggest analogies with sedimentary rocks, the textures of podiform deposits reflect extensive flowage, under magmatic conditions, …
Plus de détailsChromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4 ). Chromite is the only ore mineral of chromium (Edwards, 2012). Further, in Balochistan, Pakistan, it occurs in in a rock series called the Muslim Bagh Ophiolite (Ahmad and Abbas, 1979). The major application of chromite is in production of stainless steel.
Plus de détailsThe chromite sand has a specific gravity of about 4.50. The thermal expansion of bentonite-bonded chromite at 1000°C is of the order of 0.007 in./in. The corresponding values for similarly bonded silica sand and zircon are 0.024 and 0.003 respectively. ... Among the biggest chrome-ore producers are Cuba, Greece, India, the Philippine Republic ...
Plus de détailsChromite is the most important chromium ore mineral. It forms a complete solid solution series with many other members of the group, eg. in the Chromite-Hercynite Series, Chromite-Spinel Series, Chromite-Magnetite Series and the Chromite-Magnesiochromite Series.It is the iron analogue of Zincochromite, Cochromite, Manganochromite and …
Plus de détailsHigh-Cr and high-Al chromitites from the Sagua de Tánamo district, Mayarí-Cristal ophiolitic massif (eastern Cuba): Constraints on their origin from mineralogy and …
Plus de détailsChromite is an oxide mineral that an iron chromium oxide with formula: FeCr2O4. It is belonging to the spinel group. Chromite is the most important ore of chromium. ... From the Moa district, northern Cuba. On Luzon, Philippines. From the Stillwater complex, Montana, USA. References • Bonewitz, R. (2012). Rocks and …
Plus de détailsNovember 12, 1957. 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 ...
Plus de détailsThe 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).
Plus de détailsChromite is almost twice as dense as a basaltic melt (4,800 kg/m 3 and 2,600 kg/m 3, respectively) and is expected to settle to the chamber floor in a random closely-packed lattice in which all ...
Plus de détailsChromite, the only commercial source of chromium, ... In Cuba, important refractory ores carrying 33%–43% Cr 2 O 3 are found in Camaguey, Oriente, and Matanzas. There are also huge tonnages of low-grade chromiferrous nickel-iron ores in Mayari and Mao Bay. Small deposits of high-quality ore occur in the Mysore and Odisha states of India.
Plus de détailsChromite occurrences of eastern Cuba were discovered in the 19th century, although they were described as iron ores. They have been exploited since 1916. Addresses: G.P. …
Plus de détailsNovember 12, 1957 Detailed gravity surveys were made in Camaguey Province, Cuba, as part of a systematic exploration program conducted by the U. S. Geological Survey on …
Plus de détailschromite, and hydrous Mg- and Ni-rich silicates. At the top of the saprolite is a transition into a clay-rich layer. Above the clays is a limonite layer with goethite, maghemite, hematite, gibbsite, and Mn- ... as many of the deposits in Cuba, are oxide ore Ni-Co laterite deposits. A few deposits in Greece and the Ural Mountains (Russia) are ...
Plus de détailsAbstract. 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 …
Plus de détailsThe Raman spectrum of chromite shows three bands in the CrO stretching region at 730, 560 and 445 cm -1. The most intense peak at 730 cm -1 is identified as symmetric stretching vibrational mode, A 1g (ν 1 ) and the other two minor peaks at 560 and 445 cm -1 are assigned to F 2g (ν 4 ) and E g (ν 2 ) modes, respectively.
Plus de détailsCuba 5500. Philippines 4800. Indonesia 4500. South Africa 3700. China 2900. Canada 2700. Madagascar 1600. Colombia 1100. Dominican Republic 930. ... chromite overburden has been estimated at ...
Plus de détailsThe Potosí Mine is located in the Moa-Baracoa massif in the easternmost part of the Cuban Ophiolitic Belt. Chromite mineralization occurs within the mantle–crust transition zone. Two events of magma intrusion overprint the chromitite bodies: one gave rise to the crystallization of pegmatitic olivine–norite dikes, and the other produced …
Plus de détailsPrepared by Ruth F. Schulte [(703) 648–4963, [email protected]] CHROMIUM (Data in thousand metric tons of contained chromium unless otherwise noted) Domestic Production and Use: In 2021, the United States was expected to consume 5% of world chromite ore production in various forms of imported materials, such as chromite ore, chromium …
Plus de détailsChromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4 ). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or ...
Plus de détailsThe Mercedita mine (Moa-Baracoa massif) is the largest deposit of ophiolitic chromite in Cuba. The chromitite is Al-rich (Cr# 0.41-0.54) and PGE-poor (55.8-165.9 ppb). The whole-rock PGE ...
Plus de détailsChromite deposits In the Moa district, on the north coast of Oriente Province, Cuba, form one facies of the ultramafic complex in which they occur. Two planar structures, one a compositional layering due to variations in the relative proportions of olivine, pyroxene, plagioclase feldspar, and chromite, and the other a foliation caused by the orientation of …
Plus de détailsDetailed 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 ...
Plus de détailsFeb 27, 2023. South Africa was the leading producer of chromium worldwide in 2022, with production amounting to 18 million metric tons. The total global mine production volume of chromium that ...
Plus de détailsThe Northern Cuban Ophiolite Belt comprises a set of strongly faulted ultramafic, plutonic, volcanic and sedimentary mélange complexes that define a discontinuous W–E belt in northern Cuba (Fig. 1, inset).This Ophiolitic Belt is part of the Cuban fold belt, a tectonic unit made up of deformed and metamorphosed nappes …
Plus de détailsCuba cobalt, nickel, iron ore, chromium, copper, salt, timber, silica, petroleum, arable land. Curacao. calcium phosphates, protected harbors, hot springs. ... copper, vanadium, salt, natural gas note: South Africa was the World's leading chromite ore producer in 2022 with an output of 18,000 mt. South Georgia and South Sandwich Islands fish ...
Plus de détailsChromite deposits of the Sagua-Baracoa range, Eastern Cuba. EN. English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian Lithuanian česk ... Eastern Cuba . Chromite deposits of the Sagua-Baracoa range, Eastern Cuba ...
Plus de détailsChromite deposits In the Moa district, on the north coast of Oriente Province, Cuba, form one facies of the ultramafic complex in which they occur.
Plus de détailsThe Cayo Guam deposit is not a single chromite orebody. As Rui et al. (2022a) described in text and shown in Fig. 1 c and d, the Cayo Guam chromite deposit "contains dozens of orebodies". The term "Ti-poor high-Al" was used to describe the chemical features of studied Cayo Guam chromitites of the MBOM (Rui et al., 2022a).We …
Plus de détailsThe chromitite pods of the Moa-Baracoa massif, in the eastern ophiolitic belt of Cuba, contain pre-existing gabbro sills. This association is affected by two processes of hydrothermal alteration.
Plus de détailsAs a contribution to the War Production Board's program of exploration for strategic minerals and under an arrangement with the Bethlehem Steel Company, Gulf Research & …
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