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·The exact age & origin of chromite ore deposits can vary depending on the deposit but many are thought to have formed between 1 & 3 billion years ago during the Earth s early history The Bushveld Complex in South Africa and the Great Dyke in Zimbabwe contain the majority of the world s known chromite
·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
6 ·High purity chromite deposits are rare due to the natural replacement of chromium and ferrous iron by other elements 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
·ACF which currently produces about 30 000 tpm of chromite ore from seven chrome rich deposits across its 11 000 ha land holding first began operations in the country in 2014 and was awarded
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 stratiform deposits occur
·In the Zimbabwe craton chromite deposits have been documented from the Shurugwi Ultramafic Complex Cotterill 1969 Cotterill 1979Stowe 1987 the Great Dyke Worst 1958 Worst 1960Wilson
Chromite from Zimbabwe Chromite Mutorashanga Makonde District Mashonaland West Zimbabwe & Kojonen K 2003 Geochemistry and mineralogy of platinum group elements at Hartley Platinum Mine Zimbabwe Mineralium Deposita 38 3 327 343 J C 2006 Gemmology geology and origin of the Sandawana emerald deposits Zimbabwe Scripta
·chromite deposits are found in dunite or peridotite near the contact of the cumulate and tectonite zones in ophiolites We 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
·Magmatic chromite deposits chromitites are the only source of chromium for industrial use and in some case they may carry subeconomic to economic amounts of Finland Mt Zimbabwe Mt and Brazil Mt Platinum Group Elements PGE Platinum was discovered by Julius Scaliger in 1735 Palladium rhodium osmium and
·Abstract Re‐Os data for chromite separates from 10 massive chromitite seams sampled along the 550‐km length of the ‐Ga Great Dyke layered igneous complex Zimbabwe record initial 187Os/188Os ratios in the relatively narrow range between and This range of initial 187Os/188Os values is only slightly higher than the value for the
·A review of the early Precambrian geological record approximately 3500 2500 Ma of Zimbabwe shows that the distribution of mineralisation pertaining to gold nickel chromite chrysotile asbestos and pegmatites is for a variety of reasons not random either in time or space and that most relate to events spanning the Archaean Proterozoic transition
·Gold deposits of Zimbabwe Harare Zimb Geol Surv Miner Resour Ser 23 75 Google Scholar Bartholomew DS 1990b Base metal and industrial mineral deposits of Zimbabwe Zimbabwe Geological Survey Harare Chromite deposits of the Shurugwi greenstone belt Zimbabwe In Stowe CW editor Evolution of chromium ore fields New York
In the Great Dyke of Zimbabwe the principal platinum group element PGE bearing horizon termed the main sulfide zone is hosted in orthopyroxenites Prendergast and Wilson 1989 PGE mineralization has been demonstrated to occur bimodally in mafic ultramafic intrusions either hosted by sulfides or as discrete platinum group minerals
·Zimbabwe s chrome deposits are rich but often face export restrictions and logistical challenges Great Dyke are two of the world s most substantial layered intrusions renowned for their vast chromite deposits However the geological formations and subsequent ore grades exhibit distinct differences
The important world class stratiform deposits include the Bushveld Complex South Africa the Great Dyke Zimbabwe the Stillwater Complex United States and the Kemi deposit Finland
·Chromite • Largest high grade chrome ore resources in the world in 11 narrow but persistent seams on the Great Dyke • Most so called small mines are sitting on large deposits nearly all of Zimbabwe s large mines were initially operated as small mines • Opportunities to re examine the hundreds of small mines
·The Zimbabwe Craton in southern Africa possesses typical Archean granitoid greenstone belts that provide crucial information on the evolution of Archean continental crust Wilson et al 1978; Fig 1 The chromite deposits of the Paleoarchean Bacuri Mafic Ultramafic Complex in the Guyana Shield Amazonian craton Brazil were recently
·The chromite stretch can be of kilometers and huge tonnages are present The average grade is only 43% Cr 2 O 3 The Great Dyke of Zimbabwe traversing nearly the length of the country is very similar and has been linked to the Bushveld in geological history Other stratiform deposits occur in Madagascar and in the Odisha district of India •
·Chromite is an efficient petrogenetic tool as its composition is characteristically distinct and diverse in different deposits Irvine 1965 Dick and Bullen 1984 Roeder 1994 Stowe 1994 Rollinson 1995a Rollinson 2008 Kamenetsky et al 2001 Mondal et al 2006 Mukherjee et al 2010 Mukherjee et al 2015 This is largely because the chemical
Geological characteristics and genesis of Zvishavane chromite deposit Zimbabwe ：2015 03 25 DOI ： Zimbabwe great dyke harzburgite pyroxenite chromite
This paper offers the first ever study of a local chromitite stringer 2 cm wide enriched in platinum group elements PGE from the Kevitsa Ni Cu PGE deposit Chromite forming this chromitite is Expand
·Archean komatiitic sill hosted chromite deposits in the Zimbabwe Craton Economic Geology 103 5 981 1004 doi / CrossRef Google Scholar Prendergast MD and Wingate MTD 2013
·Chromite Chromite from Zimbabwe Chromite from Shurugwi Zimbabwe 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
The most important historic sources of chromite from podiform deposits are in Kazakhstan Turkey and Albania Papp and Lipin 2001a b; Papp 2010 Zimbabwe is the only country to exploit both stratiform and podiform deposits Fig Mining of chromite is carried out by open pit and underground mining
