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Witwatersrand Gold Deposits 911 Metallurgist

13022018· Witwatersrand Gold Deposits Here is some history of the Witwatersrand Gold Style Ore Deposits as they related to South Africa since the arrival of the Dutch and the southernmost tip of the continent in 1652 The Dutch set up a small fort where Cape Town stands today and started Market Gardens as a place that the Dutch02022015· Witwatersrand gold deposits formed by volcanic rain, anoxic rivers and Archaean lifeWitwatersrand gold deposits formed by volcanic rain21022019· This stage was accompanied by the largest known concentration of gold in Earth’s history, initially by microbial fixation on emerging colonies of probably cyanobacteria in nearcoastal environments, subsequently by mechanical reworking of the goldrich microbial mats to form conglomeratehosted placer deposits The source of the huge amount of gold in the WitwatersrandThe Witwatersrand Basin and Its Gold Deposits | SpringerLink

Witwatersrand gold deposits (pdf) | Paperity

This points to the existence of sedimentary, although subeconomic, gold deposits of an age greater than 3 300 million years `Biochemically' Deposited Gold Layers of carbonaceous matter which often accompany the gold bearing strata on the Witwatersrand have been recognised as fossilized Precambrian plant mats (5)In his model for the source of gold in palaeoplacers in the Mesoarchean (eg, the giant Witwatersrand Basin), Frimmel (2014 Frimmel (, 2019 explains that mass balance calculations exclude the soleThe Witwatersrand Basin and Its Gold Deposits: MethodsWitwatersrand Gold Deposits A special type of gold deposit is the Witwatersrand goldmine in South Africa, which is by far the biggest gold field in the world About 40,000 tonnes of gold have already been extracted from it The Witwatersrand goldmine is identified as a socalled mixed type of primary and secondary gold depositsGold Deposits | Goldfo

Hydrothermal alteration and gold mineralization in the

Witwatersrand •Vast goldfields, •enveloped by even larger hydrothermal systems, •to which gold mineralisation has been related • aring Horwood (1917) “Gold deposits of the Rand” Giffin, London •Phillips & Law (1980’s) •Leeds Group, Anglogold (1990’s) Barnicoat & others,012015· The VRC consists of different unconformitybounded stratigraphic packages of channelled or sheetlike deposits of conglomerate and sandstone regarded to have formed in a fluvial braidplain environment (Krapez, 1985, Engelbrecht et al, 1986, McCarthy, 1994)Gold accumulation in the Archaean Witwatersrand BasinStudies of the morphology and other properties of the gold particles in the fossil placer gold deposits of the Witwatersrand provide fascinating glimpses of the conditions under which they were formed In particular they indicate that in some areas primitive plant life on the deltas on which the gold was deposited acted not only like the legendary golden fleece in concentrating fine goldWitwatersrand gold deposits | SpringerLink

The Witwatersrand Basin and Its Gold Deposits: Methods

By comparing worldwide Witwatersrandtype deposits/occurrences, ranging in age from 31 to 18 Ga, we propose that the primary concentration of gold in the continental crust resulted from02022015· The Witwatersrand gold deposit is the largest in the world Thermodynamic calculations show that such rich accumulations of gold could be linked to abundant volcanism, primitive life and theWitwatersrand gold deposits formed by volcanic rainScientists have for the first time directly dated gold from South Africa's Witwatersrand gold deposits, source of more than 40 percent of all gold so far mined on Earth An international team of geologists led by the University of Arizona has discovered that the gold is around 3 billion years old older than its surrounding conglomerate rock by a quarter of a billion years More, their stateofScientists Discover That 40 Percent of the World's Gold is

The formation of gold deposits in South Africa

20042017· At a first glance, the Witwatersrand basin, the largest known gold resource on our planet, is not automatically related to ocean research However, in its 3 billion years old geological history01111985· The geochemistry of Witwatersrandtype gold deposits and the possible influence of ancient prokaryotic communities on gold dis solution and precipitation Precambrian Res, 30: 303319 Compared to the prokaryotedominated lower Proterozoic there are few environments now left on Earth where prokaryotes are dominant By about 25 Ga chemical conditions affecting the solution andThe geochemistry of Witwatersrandtype gold depositsWitwatersrand •Vast goldfields, •enveloped by even larger hydrothermal systems, •to which gold mineralisation has been related • aring Horwood (1917) “Gold deposits of the Rand” Giffin, London •Phillips & Law (1980’s) •Leeds Group, Anglogold (1990’s) Barnicoat & others,1997Hydrothermal alteration and gold mineralization in the

Witwatersrand Gold Rush Wikipedia

The gold rush saw massive development of Johannesburg and the Witwatersrand, and the area remains the prime metropolitan area of South Africa One consequence of the gold rush was the construction of the first railway lines in this part of Africa As a result of the rapid development of the goldfields on the Witwatersrand in the 1880s and the demand for coal by the growing industry, aPhotomicrographs of gold grains from Witwatersrand Basin deposits, South Africa 18 12 Photomicrographs of various forms of pyrite crystals from Witwatersrand Basin deposits, South Africa19 13 Spatial trends in the Chemical Index of Alteration with distance to gold reefs in the Witwatersrand Basin gold province, South Africa 21 14 Geochronological comparison for theQuartzPebbleConglomerate Gold DepositsThe classic case of invisible gold on pyrite rims is found in Carlin deposits [30,31] An example is shown in Figure 5A, but better examples are found in [32]The AuAs rims vary in thickness from(PDF) Hydrothermal Replacement Model for

Witwatersrand gold deposits formed by volcanic rain

02022015· The Witwatersrand gold deposit is the largest in the world Thermodynamic calculations show that such rich accumulations of gold could be linked to abundant volcanism, primitive life and theSimplifying solutions to the metallogeny of Witwatersrandtype gold that do not take into account the diverse types of gold in the deposits, are unrealistic Precipitated gold associated with kerogen is only one of four main types of Witwatesrand gold, but it may be the major one Our proposed model to account for this gold involves the weathering of gold from Archean source rock underThe geochemistry of Witwatersrandtype gold depositsStudies of the morphology and other properties of the gold particles in the fossil placer gold deposits of the Witwatersrand provide fascinating glimpses of the conditions under which they were formed In particular they indicate that in some areas primitive plant life on the deltas on which the gold was deposited acted not only like the legendary golden fleece in concentrating fine goldWitwatersrand gold deposits | Semantic Scholar

Gold on the Kaapvaal Craton, outside the Witwatersrand

01032017· Greenstone gold deposits are irregularly distributed, both in terms of their size and distribution Only about 1% of greenstone deposits can be regarded as successful mines, while the vast majority remain as showings Geographically, these gold deposits are preferentially located along lithostructural features where both fluid flow and wallrock conditions were suitable for mineralisationA Literature Survey of the Metallurgical Aspects of Minerals in Witwatersrand Gold Ores No M37 Council for Mineral Technology ⓘ Crandallite Formula: CaAl 3 (PO 4)(PO 3 OH)(OH) 6 Locality: West Driefontein cave, Carletonville, Western Sector, Far West Rand (West Wits Line), West Rand District Municipality, Gauteng, South Africa Reference: Martini, I (1978) Mineralogy of the TransvaalWitwatersrand goldfield, South AfricaA brief overview of the history and development of Witwatersrand, the famous gold mine of South Africa With photos, facts, and figures about its impact on the growth of the region, the history of precious metals in the area, and the people that have mined the gold from the ground, even up to todayWitwatersrand Gold Rush | The Famous South African

Models and Exploration Methods for Major Gold Deposit Types

well as the Witwatersrandtype gold deposits, which are more than adequately reviewed in recent literature (Frimmel et al, 2005; Law and Phillips, 2005) Exploration is mainly preoccupied with defining the footprints of known gold deposits and with integrating various techniques with geology for their efficient identification and detection Accordingly, the first part of the paper reviews theCobalt, nickel, and gold in pyrite from primary gold deposits and Witwatersrand reefs F M Meyer and LJ Robb Economic Geology Research Unit, Department of Geology, University of the Witwatersrand, PO Wits 2050, Johannesburg, Republic of South Africa T OberthLir, R Saager and HD Stupp MineralogischPetrographisches Institut der Universitat zu K6ln, West Germany Accepted 30Cobalt, nickel, and gold in pyrite from primary goldWitwatersrand Gold Fields: Geology, Genesis, and THIS Gold in 2000volume is organized around a classification of hypogene gold deposits that emphasizes their tectonic setting and relative time of formation compared to their host rocks and other gold deposit types (eg, Sawkins, 1972, 1990; Groves et al, 1998; Kerrich et al, 2000)The temporal division of orogenic gold deposits into Archeanwitwatersrand gold deposits in suriname

The impact of gold mining on the Witwatersrand on the

The Witwatersrand Supergroup contains more uranium than gold and the Witwatersrand gold mines are in fact also uranium mines Uranium was originally mined as a byproduct of the gold mining industry in Gauteng and the West Rand (Von Backström, 1976) South Africa also had one of the first uranium extraction plants in the world, which provided the uranium used in the making of the atom bombs