Witwatersrand Gold Deposits From

Witwatersrand - Wikipedia

The Witwatersrand plateau consists of a 5000-to-7000-metre-thick (3.1–4.3 mi) layer of mainly sedimentary rocks laid down over a period of about 260 million years, starting approximately 2.97 billion years ago. The entire series of rocks, known as the "Witwatersrand Supergroup," consists of very hard erosion resistant quartzites, banded ironstones and some marine lava deposits, interspersed with softer, more easily eroded tillites, mudstones and conglomerates. The oldest roc…

Witwatersrand gold deposits (pdf) | Paperity

The distribution of gold and uranium in the Witwatersrand deposits is essentially controlled by the paleo-environment. Like any other ecological system the palen-Witwatersrand consisted of smaller systems in which local environments determined the distribution of economic minerals. With our present knowledge we perceive the paleo-Witwatersrand as a basin surrounded by …

Gold Deposits | Gold.info

Witwatersrand 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 so-called mixed type of primary and secondary gold deposits.

Witwatersrand Gold Fields: Geology, Genesis, and ...

The Witwatersrand gold fields of South Africa account for more than a third of the world's total gold production since mining started there in 1886: 48,000 t Au. These gold fields dominated production throughout the twentieth century, but production peaked at 1,000 t in 1970 and has steadily declined since that time.

The Witwatersrand Basin and Its Gold Deposits | SpringerLink

21.02.2019· The source of the huge amount of gold in the Witwatersrand is thought to be the entire greenstone-dominated Archaean cratonic surface, which was subjected to intensive chemical weathering permitting large-scale leaching of gold by contemporaneous surface waters. Syn-depositional tectonism that extended from the hinterland into the foreland basin led to repeated further physical reworking of gold-rich sediments to form more placer deposits …

Witwatersrand gold deposits (pdf) | Paperity

The distribution of gold and uranium in the Witwatersrand deposits is essentially controlled by the paleo-environment. Like any other ecological system the palen-Witwatersrand consisted of smaller systems in which local environments determined the distribution of economic minerals. With our present knowledge we perceive the paleo-Witwatersrand as a basin surrounded by …

Gold Deposits | Gold.info

Witwatersrand 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 so-called mixed type of primary and secondary gold deposits.

Witwatersrand Gold Fields: Geology, Genesis, and ...

The Witwatersrand gold fields of South Africa account for more than a third of the world's total gold production since mining started there in 1886: 48,000 t Au. These gold fields dominated production throughout the twentieth century, but production peaked at 1,000 t in 1970 and has steadily declined since that time.

Witwatersrand gold deposits formed by volcanic rain ...

Precipitation of the richest gold deposits could have been triggered by chemical reduction of the dissolved gold onto organic material in shallow lakes and pools. I conclude that the Witwatersrand...

Nunavut diamond-gold deposit mirrors SA’s …

The Witwatersrand Goldfields comprise the world’s biggest gold deposit, responsible for more than 40% of the gold ever mined on Earth. Led by Graham Pearson, a research team travelled to …

The formation of gold deposits in South Africa

In 1852, the English prospector J.H. Davis discovered the first gold in the Witwatersrand, leading to the South African gold rush and the discovery of much more gold deposits within the basin....

Ancient placer gold deposits | SpringerLink

Individual ancient placer deposits like the Steyn/Basal placer in the Welkom goldfield of South Africa have produced in excess of 4500 t (metric tons) of gold from heavy mineral concentrates distributed over a palaeosurface area of 170 km 2 (Minter et al., 1986). This amounts to about 26 t of gold/km 2. Another important deposit, the Vaal placer, ...

The impact of gold mining on the Witwatersrand on the ...

15.06.2012· Undoubtedly this gold originated from the Witwatersrand, Ventersdorp and Transvaal Supergroups. Marais, like many other prospectors at the time, focussed on the alluvial deposits in the rivers and although they crossed the Witwatersrand Supergroup often, the largest gold deposit in the world remained unknown.

Thermal properties of stratified rocks from Witwatersrand ...

Figure 1—Locality map of Witwatersrand gold mining areas showing positions of boreholes (1–16) and mines (A–K) from which rock samples analysed for thermal conductivity, density and heat capacity were derived. Boreholes are named after farms on which they were drilled. K, thermal conductivity (W m-1K ), ρ, density (kg m-3), h, heat capacity (J kg-1K ), κ, thermal …

Major Gold Deposit Types and Exploration process

Major Gold Deposit Types and Exploration process N. N. Singh Indo Gold Mines Private Ltd, 68B Sect-9, HM; Udaipur, India 313001 [email protected] Gold occurs as primary commodity in a wide range of gold deposit types and settings. Three main clans of deposits are now broadly defined, each including a range of specific deposit types with common characteristics …

witwatersrand gold deposits from - pdsasa.co.za

Witwatersrand gold deposits (pdf) | Paperity. Although gold overgrowths on pyrite are rarely well crystallized, sufficient particles have been observed to indicate that the cube faces of the gold crystals grow on the cube faces of the pyrite rotated by 45 Genesis of the Witwatersrand Gold Deposits Although at one time the subject of controversy, the fossil placer nature of the ...

Witwatersrand Gold Rush | The Famous South African …

A 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 today.

The impact of gold mining on the Witwatersrand on the ...

15.06.2012· Undoubtedly this gold originated from the Witwatersrand, Ventersdorp and Transvaal Supergroups. Marais, like many other prospectors at the time, focussed on the alluvial deposits in the rivers and although they crossed the Witwatersrand Supergroup often, the largest gold deposit in the world remained unknown.

Quartz-Pebble-Conglomerate Gold Deposits

another quartz-pebble-conglomerate gold deposit as rich as the Witwatersrand deposits remains highly unlikely because of the confluence of features necessary to create such a large endowment of gold. However, some smaller occur-rences do exist in the United States. Pyritic paleoplacers of sub-ore grade are found in the Deep Lake Group and Phantom Lake …

Witwatersrand Gold Rush - Wikipedia

Main article: Witwatersrand Basin The first discovery of gold in the region is recorded as being in 1852 in the Pardekraal farm by J.H. Davis, an English miner. He sold £600 of gold to the Transvaal Treasury and was subsequently ordered to leave the country.

Thermal properties of stratified rocks from Witwatersrand ...

Figure 1—Locality map of Witwatersrand gold mining areas showing positions of boreholes (1–16) and mines (A–K) from which rock samples analysed for thermal conductivity, density and heat capacity were derived. Boreholes are named after farms on which they were drilled. K, thermal conductivity (W m-1K ), ρ, density (kg m-3), h, heat capacity (J kg-1K ), κ, thermal …

Models and Exploration Methods for Major Gold Deposit Types

well as the Witwatersrand-type 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 …

Scientists Discover That 40 Percent Of The World's Gold …

Scientists 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.

Hydrothermal replacement model for Witwatersrand …

Orogenic gold provinces may also have been eroded from the catchment to the Witwatersrand basin (Frimmel et al., 2005), although opinion remains divided as to the origin of those gold deposits ...

Major Gold Deposit Types and Exploration process

Major Gold Deposit Types and Exploration process N. N. Singh Indo Gold Mines Private Ltd, 68B Sect-9, HM; Udaipur, India 313001 [email protected] Gold occurs as primary commodity in a wide range of gold deposit types and settings. Three main clans of deposits are now broadly defined, each including a range of specific deposit types with common characteristics …

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