magmatic ore deposits - bu,formation of stratiform chromite chromite, the main ore mineral of chromium, crystallizes from a magma and, because it is denser than the magma, sinks to the bottom and accumulates in a process called crystal settling. b-podiform chromite deposits:.process optimization of a chrome ore gravity concentration plant …,high-alumina chromite, largely from podiform deposits, is used in refractory applications, while iron-rich ores, largely from stratiform deposits, are utilized in metallurgical and chemical applications. around 96% of world chromite ore production is.minerals | special issue : chromite deposits: mineralogy, …,since then, chromites have been classified into two descriptive types: “stratiform deposits” mainly associated with layered intrusions in continental cratons, and “podiform deposits” associated with ultramafic complexes in orogenic belts (ophiolites, ural–alaskan.classification of mineral deposit in egypt,iii) mineral deposits are grouped and a list of deposits pertaining to each group is given along with a review of the geology and economic potentials of the more important ores., iv) the mode of formation and geotectonic environment of each group has developed, in 30..
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many chromite deposits can be classified as one of the following: (1) layered mafic complexes, (2) podiform ophiolite deposits, (3) komatiitic depos its, and (4) chromite placers. the layered complexes, are by far the most.mineral deposits: types and geology | springerlink,from a geological point of view, a simple genetic classification of mineral deposits encompasses four main groups: magmatic, hydrothermal, sedimentary, and metamorphic/metamorphosed, each of them with several types and subtypes..sustainable development through beneficiation of low grade chromite …,commercial chromite deposits are found in two forms : stratiform seams and irregular podiform/lenticular deposits. (figure 1 – types of chrome ore deposits) chrome ore deposits can also be classified as siliceous type (silica rich) and ferruginous type (iron rich)..podiform chromite deposits—database and grade and tonnage …,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 new grade and tonnage models for podiform chromite deposits.
this model of stratiform chromite deposits is part of an effort by the u.s. geological survey’s mineral resources program to update existing models and develop new descriptive mineral deposit models to supplement previously published models for use in mineral.chromite: the only mineral ore of chromium metal,however, chromite deposits that are large enough for mining are generally found in: 1) stratiform deposits (large masses of igneous rock such as norite or peridotite that slowly crystallized from subsurface magma); 2) podiform deposits (serpentines and other.usgs scientific investigations report 2010–5070–e: stratiform …,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 of large, layered mafic-ultramafic stratiform.stratiform deposit - an overview | sciencedirect topics,podiform chromite deposits are parts of cumulate sequences that are part of the moho transition to the upper mantle section of ophiolites (thayer, 1964; greenbaum, 1977; arai, 2010). massive pods of chromite ore may be accompanied by lateral zones of disseminated chromite that can be traced for hundreds of meters.
commercial chromite deposits that are large enough for mining are generally found in: (1) stratiform deposits, and (2) podiform deposits (murthy et al., 2011; papp and lipin, 2001a). other sources of chromite are laterites that are weathering products of peridotite. laterites are more widely known as sources of nickel and cobalt (papp, 2010)..usgs: mineral resources on-line spatial data: philippines,podiform chromite deposits--database and grade and tonnage models 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. info podiform chromite deposits.types of chrome mining,however, chromite deposits that are large enough for mining are generally found in: 1) stratiform deposits (large masses of igneous rock such as norite or peridotite that slowly crystallized from subsurface magma); 2) podiform deposits (serpentines and other.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 .
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. most of the world'... schulte, ruth..chromite deposits in turkey -,turkey is well known for its chromite resources. especially, the guleman mine, southeastern anatolia, is the most abundant in chromite reserve of this country. the mode of occurrence of the chromite deposits of this mine is briefly described based on the author's observation. then the ultrabasic rocks and the associated chromite ores from the.system appendpdf cover-forpdf - university of toronto,in the oman ophiolitic complexes, the following three types of chromite deposits are distinguishable according to their structural position (auge 1987): i) cumulate sequence deposits in the form of stratiform, ii) top-mantle sequence deposits, iii) deeper mantle deposits..chapter 10 mineral resources and prospectivity of the ultramafic rocks of new caledonia …,the main metallic mineral resources of new caledonia are hosted by the obducted peridotite nappe. ni, co, cr and the pt group elements (pges) are specific to this ultramafic terrane. cr, as podiform chromitite in the uppermost mantle, is the only hypogene metal mined economically in the past. the largest chromitite deposits are located in the lherzolitic tiébaghi massif. supergene ni and co
mineral systems deposit types commodities northern brooks range (angayucham terrane) pge alaska alaska mafic magmatic nickel-copper-pge sulfide pge; cobalt southern brooks range (angayucham terrane) pge alaska alaska mafic magmatic.no viable substitute for critical chromium - north of 60 mining news,another 12 chromite deposits and occurrences were identified on sheep hill and dust mountain. one deposit at sheep hill is estimated to contain 26,000 tons of chromium oxide. not all the chromite found in this deposit, or the other occurrences on sheep hill and dust mountain, however, is considered able to be concentrated to the specifications needed for alloying..principal features and origin of podiform chromite deposits, and some observations …,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.introduction and overview of mineral deposit modeling - usgs,also, it was discovered that the platinum-group element abundances of minor podiform chromite deposits are similar to those of major podiform chromite deposits (no. 8b). a part of the analysis of platinum-group elements is tabulated, and grade models
podiform chromite deposits tectonite peridotite from dickey. 1975 sea level 5km- magma pockets podiform chromite deposits 30-35-linimumdepth of residual *'t (melt-depleted) peridotite v lavas dikes cumulates residual tectonite peridotite xzone of.peg leg mine (lambert claim; white and brown mine; moffett creek group; chromite …,mineralization is a podiform chromite deposit (model #15), hosted in dunite. local structures include a sharp fault striking n70-75w, dipping 20-30n. tectonic structures include the.chrome ore beneficiation challenges & opportunities – a review,beneficiation practices depend on the mineral characteristics of the ore deposits, gangue mineral assemblage and the degree of dissemination of constituent minerals. in general chromite beneficiation flow sheet ( fig. 2 ) has two major sections: comminution (for preparing the material to the subsequent unit operations) and concentration.