Chromite grains in nearly fresh Archean komatiites from the late Archean Belingwe greenstone belt (ca. 2.7 Ga), in Zimbabwe, have diverse morphologies: skeletal and dendritic chromite is restricted to spinifex zones, whereas euhedral grains occur throughout the flows. Systematic differences in chromite compositions ate present between the spinifex (iop) and cumulate …
based on the analysis of regional geological background, geological characteristics of the deposit area and prospecting criteria, this article summarizes the genesis of zvishavane deposit:the orebodies are generally located in the pyroxenite or the contact area between harzburgite and pyroxenite in each magmatism cycle, and it is parallel to the …
The major share of chromite deposits (98.6%) associated with ultramafic [i] complexes are in Sukinda and Baula Nuasahi region. The Sukinda ultramafic complex (Longitude: 85° 40′ E -85° 52′ E...
The platinum and chrome deposits are in the lower part of the lobes which is the green areas on the map so mineralization out crops around the rim and dip shallowly towards the center of the intrusion rather like in the Sudbury …
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...
pp. 981–1004 Archean Komatiitic Sill-hosted Chromite Deposits in the Zimbabwe Craton M. D. PRENDERGAST... Scotland, United Kingdom Abstract Lenticular chromite deposits of widely varying age, metamorphic grade ...
Zimbabwe currently has 14 ferro-chrome operations concentrated mainly in the Midlands Province with the two largest players, Zimasco and Afrochine, operating medium sized furnaces while the rest utilise small …
Chromite from Zimbabwe: Chromite from Shurugwi, Zimbabwe. The specimen is approximately 4 inches (10 centimeters) across. PODIFORM DEPOSITS Podiform deposits are large slabs of oceanic lithosphere that have been thrust up onto a continental plate. These slabs of rock, also known as "ophiolites," can contain significant amounts of chromite.
SAIMM - The Southern African Institute of Mining and Metallurgy
The chromitites in the mantle tectonites are hosted in irregular bodies of dunite, or where hosted in harzburgite are separated from harzburgite by a centi to metre-thick envelope zone of dunite (Figure 2.8b). Irregular pods and dyke-like bodies of dunite are common in the mantle sections of many ophiolites and form up to 10% of the mantle
Chromite deposits are broadly classified in early 1970's as "Stratiform" and "Podiform" according to modes of occurrence, forms, and textures. Stowe (1994) further classified Chromite …
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 over a strike length of ...
In addition, the MIC also hosts high-grade chromite and gold deposits (Wilson, 1968a, b;Wilson and Nutt, 1990;Blenkinsop, 1991;Prendergast, 2008; Chaumba, 2018). The MIC, which is located in south ...
This artisanal mining of the small, or podiform chromite deposits of Afghanistan has recently come under the scrutiny of a watchdog group in Afghanistan to ensure that both the letter of the …
The Chromite Deposits of the Great Dyke — Rhodesia (Zimbabwe) Colin J. Dixon Chapter 401 Accesses Abstract The Great Dyke is one of the most remarkable geological features known. Over five hundred kiolmetres long and rarely more than ten wide, it traverses the Archean …
Chromium ore deposits range in age from 3.5-billion year-old chromite in the Selukwe greenstone belt (Zimbabwe) to the ophiolite-hosted Miocene deposits of New Caledonia. They provide indications of the evolving earth's tectonic processes in oceanic and continental crust and mantle.Podiform orebodies are hosted in peridotites, mostly now ...
Most of Zimbabwes ferrochrome deposits lie in the Great Dyke, a mountain range that runs the length of the country, rich in ferrochrome, platinum and gold deposits. Zimasco …
Since ACF entered the chromium extraction business in 2014, its output has steadily risen, and the company now produces in excess of 30,000 tonnes of chromite per month. ACF enjoys a strong reputation as Zimbabwe's largest exporter of chromium, and has injected hundreds of millions of US dollars into the country's economy since its inception.
A combination of poor mining methods, waste storage and disposal systems, as well as the day‐to‐day activities associated with tribute and contract chromite mining are primarily …
We propose a new process that involves partial melting of Fe ± Ti oxide-rich rocks (oxide-facies iron formation or ferrogabbro) and conversion of fine-grained oxide to chromite by reaction with ...
Zimbabwe is the only country that contains notable chromite reserves in both stratiform and podiform deposits. Stratiform deposits Stratiform deposits, in layered intrusions, are the main source of chromite resources and are found in …
· Chromite: The only mineral ore of chromium metal. Podiform deposits are known in Kazakhstan, Russia, the Philippines, Zimbabwe, Cyprus, and Greece. The first discoveries of podiform chromite deposits were made near Baltimore, Maryland in the early 1800s. These deposits supplied nearly all of the world's chromite until about 1850.
Geological characteristics and genesis of Zvishavane chromite deposit, Zimbabwe. (Zvishavane),。. …
The majority of the world's identified economic chromite reserves are located in southern Africa (South Africa and Zimbabwe), Turkey, Kazakhstan, Oman, India and the Philippines. Most deposits contain a range of chromite grades, including: Metallurgical grade (high chromium chromite, minimum 40% Cr2O3) Chemical grade (high iron chromite, 46% Cr2O3)
Magmatic chromite deposits in southern Africa Edward Sampson. Edward Sampson Princeton University, Princeton, NJ, United States. Search for other works by this author on: ... Zimbabwe; Latitude & Longitude S22°30'00" - S15°30'00", E25°15'00" - E33°00'00" S28°10'00" - S22°04'60", E24°40'00" - E32°02'60"
Origin of chromite deposits; discussion Francis Eric Keep. Francis Eric Keep City Deep, Johannesburg, South Africa. Search for other works by this author on: GSW. Google Scholar ... Zimbabwe The Canadian Mineralogist. Magmatic chromite deposits in southern Africa Economic Geology. Lateral cryptic variation in the Great Dyke of Rhodesia ...
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 …
Chromium ore deposits range in age from 3.5-billion year-old chromite in the Selukwe greenstone belt (Zimbabwe) to the ophiolite-hosted Miocene deposits of New Caledonia. They …
Chromite deposits exists as stratiform mafic—ultra mafic chromite deposits (as South Africa's Bushveld deposits) or podiform (deposits in Zimbabwe) or alpine type chromite deposits (Motzer and Engineers 2004 ). Chromite ore is formed by the intrusion and solidification of molten lava and only found in rocks.
Description: Most of Zimbabwes ferrochrome deposits lie in the Great Dyke, a mountain range that runs the length of the country, rich in ferrochrome, platinum and gold deposits. Zimasco company has mined ferrochrome on the Great Dyke since the early 1900s and has been owned by local businesses, Union Carbide Corp. and Rio Tinto Plc.