Platinum (Pt) is a rare and valuable metal that is widely used in various industrial applications due to its unique properties. Platinum ore refers to the naturally occurring rocks or minerals that contain significant concentrations of platinum, usually in the form of platinum group minerals (PGMs) and associated minerals. Platinum ore is …
Podiform Chromite Deposits—Database and Grade and Tonnage Models Scientific Investigations Report 2012–5157 U.S. Department of the Interior U.S. Geological Survey COVER View of the abandoned Chrome Concentrating Company mill, opened in 1917, near the No. 5 chromite mine in Del Puerto Canyon, Stanislaus County, California (USGS …
Chromite deposits constitute the only primary source of chromium metal; in addition they record a remarkable phenomenon in the overall process of concentration by magmatic crystallization. Extensive literature exists on both aspects of chromite deposits. The readers are particularly referred to the review articles by Duke (1983) and
The Songshugou peridotite pluton hosting chromite deposite is the largest ultramafic massif occurred in Qinling Orogenic Belt. The Songshugou peridotites mainly comprise fine-grained peridotitic ...
The Koh Safi Chromite Ore Deposit is located in Afghanistan's northern–northeastern end of the Kabul–Kandahar ophiolite zone. Sedimentary formations, delayed volcanic, and ultramafic rock groups, including peridotites and serpentinites, could all have been found in the Koh Safi area, where structural discontinuities with the two …
The chromite deposit at Verref's Marico Chrome mine is described. The refractory properties of chromite and their role in basic refractories are ... exports to central Africa and to overseas markets. Samancor was formed by the amalgamation of SA Manganese Ltd and African Metals Corporation Ltd (Amcor) in 1975. It was known as SA Manganese
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 …
The Bushveld Complex hosts the largest chromite deposits worldwide [5]. In addition to hosting the largest chromite deposits, it is also the largest known layered intrusion in the world. ... Technical Report WC9761; Overseas Geology Series; British Geological Survey: Nottingham, UK, 1997; pp. 1–27. Falconer, A. Gravity Separation: Old ...
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 …
Stratiform chromite deposits are primarily hosted by peridotites, harzburgites, dunites, pyroxenites, troctolites, and anorthosites. Although metamorphism may have altered the ultramafic regions of layered intrusions postdeposition, only …
the total reserves/resources of chromite in the country as on 1.4.2015 has been estimated at 344 million tonnes with 102 million tonnes as "Reserves" (30%) and 242 million tonnes as "Remaining Resources" (70%). More than 96% resources of chromite are located in Odisha, mostly in Jajpur, Kendujhar and Dhenkanal districts. Minor deposits
Chromite deposits constitute the only primary source of chromium metal; in addition they record a remarkable phenomenon in the overall process of concentration by magmatic …
There remains a possibility that chromite may settle in the form of chromite chains/clusters produced either by heterogeneous nucleation against chromite grains suspended in the convecting melt 39 ...
Chromite is an important source for the manufacturing of stainless steel, nichrome, paint, and chemicals industries and has wide industrial utilization. In Pakistan, the chromite deposits are mostly associated with the ophiolitic sequence resulting as an outpouring of molten material in the fractured zones of the Indian plate and the Neo …
The chromite deposits of the Ipueira-Medrado Sill, Bahia, Brazil'. Econ. Geol. 98, 87–108 (2003). Article CAS Google Scholar ...
We argue on textural and mass balance evidence that these chromitite layers formed by in situ crystallisation and that their origin can be best understood in the …
One of the largest chromium deposits on Earth occurs in the Rustenburg Layered Suite (RLS) of the Bushveld Complex as laterally continuous chromitite layers. None of the hypotheses proposed for the origin of the chromitites can explain both the abundance of Cr in the RLS and the unusual enrichment in Cr and V over Ni, relative to …
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 …
The major chromite resources of China occur in ophiolites and continental intrusions. Podiform chromite deposits are mainly developed in the Palaeozoic and Mesozoic ophiolitic mantle sequences. They occur as tabular, lenticular, or irregular masses hosted by dunite lithologies, or dunite lenses, or harzburgite associated with dunite lenses. Main …
The largest chromite deposits in the western part of the syncline are the Millionnoe, Diamond Pearl and 20 Years of Kazakh SSR deposits, dipping 5–50° to the …
The massive chromite deposit in the Ring of Fire follows a 12 km strike-length. Each mining company seems to have a portion of this deposit, which remains to be fully explored. ... and in many remote locations in Canada and abroad. "The Ring of Fire represents a wonderful exploration opportunity for a host of mineral deposits," Coutts …
Chromite is an accessory phase always present within these lithologies. Small chromite deposits, exploited in the past, can be found in different localities in the complex. The contact between chromitites and their host lithologies (variably altered dunites and/or clinopyroxenites), when visible, is always sharp (Christodoulou 1980).
The podiform chromite deposit is widely distributed and closely symbiotic with ophiolite, but the scale of this deposit is generally small. There are obvious differences in the occurrence, fabric, structure and paragenetic association of the two different chromite types. The podiform chromite is mainly formed in the Phanerozoic, with a …
These deposits are in the form of a funnel shape, flat or tabular to igneous complexes hosting chromite deposit [4]. The podiform chromite is found in ophiolite sequence with associated gabbros, sheeted dykes, mafic cumulates, and tectonics [4, 5]. These chromite deposits are found in irregular shapes, such as pod or lensoidal bodies and often
Kazakhstan has the world's largest reserves of the transition metal chromium, amounting to some 230 million metric tons as of 2023. The total global reserves of chromium amounted to an estimated...
Chromite 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. Crystals are uncommon, but when found they are octahedral. Chromite is usually massive or in the form of lenses and tabular bodies, or it may be disseminated …
Chromite, Fe 2+ Cr 2 O 4, is the principal ore mineral of chromium in magmatic ore deposits and it can have a wide range of compositional variation because of multiple cationic substitutions that involve e.g. Ti, Mn, Mg, Al, Fe, Zn.However, substitution of Fe 3+ for Cr 3+ can occur to a larger extent which gives rise to iron-rich chromite …
High-Cr chromite deposits have variable divalent trace element compositions and show complex distributions of nondivalent trace elements. The former reflects longer and slower cooling histories of the high-Cr chromite deposits with respect to the high-Al chromite deposits, whereas the latter indicates more variable magma …
In the middle group, deposits' chromite concentration can reach 44–46%. • Less chromite is found in the upper ground layers with a top concentration of 43%. 9 (2) The chromium/iron ratio follows a similar trend. It decreases upwards: 9 • The Cr/Fe ratio for lower group layers (from LG1 to LG6) is 1.56–1.6:1. •