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Witwatersrand gold deposits from

  • Benchmarks: October 11, 1899: Second Boer War begins

    The Witwatersrand Basin stretches in an arc across 350 kilometers between Johannesburg and Welkom and covers an area about the size of West ia. Yet, its more than just a picturesque geologic formation Witwatersrand is home to the worlds largest gold deposit.

  • Witwatersrand gold deposits (pdf) Paperity

    Witwatersrand gold deposits D. K. Hall 0 0 Mining Technology Laboratory, Chamber of Mines of South Africa Studies of the morphology and other properties of the gold particles in the fossil placer gold deposits of the Witwatersrand provide fascinating glimpses of

  • Witwatersrand System geology Britannica

    The Witwatersrand rocks overlie rocks of the Dominion Reef System, underlie those of the Ventersdorp System, and occur in an east-west band from Randfontein to Springs and from the Vaal River in the region of Klerksdorp in the north to Ventersdorp in the south.

  • Silver and mercury in single gold grains from the

    The contents of silver and mercury in 323 spots on gold grains from seven localities of the Witwatersrand palaeo-placer and Archaean vein deposits from Barberton were measured using an electron microprobe. The objective was to obtain information on the extent of gold alteration during fluvial transport and post-depositional geological processes.

  • The Witwatersrand Gold Deposits of South Africa

    The Witwatersrand Gold Deposits of South Africa Perhaps the most remarkable goldfield on the planet is found in the Witwatersrand district of South Africa. The connected chain of mines that lies east and west of Johanesburg has produced a considerable portion of the worlds gold .

  • Witwatersrand Gold Rush - Wikipedia

    The Witwatersrand Gold Rush was a gold rush in 1886 that led to the establishment of Johannesburg, South Africa. It was a key part of the Mineral Revolution. and that silt and gold deposits from alluvial gold settled in the area to form the gold-rich deposits

  • GEOLOGY 101 - Paleoplacer gold deposits, Pt. 1 - The

    Jan 12, 1998· Gold (and uranium) is concentrated in paleoplacer deposits much as it is in placer deposits, in paystreak-like concentrations. The paystreaks are thin sheets of quartz pebble conglomerate interlayered with thicker beds of sedimentary rocks. In the Witwatersrand deposits, paystreaks can extend for up to 10 km, but are usually less than 3 metres

  • Gold Deposits Goldfo

    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.

  • Scientists Discover That 40 Percent of the World's Gold is

    Sep 10, 2002· The new results confirm that the Witwatersrand gold deposits are "placer" deposits – that millions of years ago, ancient rivers carried gold particles, along with sand and silt, into the Witerwatersrand basin – then a great lake – possibly from granite mountains to the north and southwest.

  • Witwatersrand Basin (RSA) - Universität Klagenfurt

    Peak gold production occured in 1970 when over 1000 metric tommes were mined, generating US $1,164 billion in sales, however gold production has declined since 1980. The average recovery grade of the Witwatersrand gold mines has declined from 13,28 grammes/tonne in 1970 to 5,3 grammes/tonne in 1991. 2 Minerals:

  • Detrital origin of hydrothermal Witwatersrand golda

    The Witwatersrand basin is the largest known gold province in the world. The gold deposits have been worked for moren than 100 years but there is still controversy about the ore forming process.

  • Attenuation of pollution arising from acid mine AUTHORS

    7700 tonnes of gold (~246 million oz.) have been extracted from the treatment of approximately 940 million tonnes of rock. The gold was contained in quartz pebble conglomerates, which are hosted in a sequence of siliceous quartzites of the Witwatersrand Supergroup. The deposits are now largely worked out and most mining has ceased.

  • Visualizing the Formation of Uranium and Gold Ore Related

    The Formation of Gold and Uranium Ore in the Witwatersrand Deposits. Located in the central part of the Kaapvaal Craton in South Africa, the Mesoarchean Witwatersrand basin is a sequence of metasedimentary rocks that span 7.5 km and include conglomerates, shales, and quartzites.

  • The viability of using the Witwatersrand gold mine

    The Witwatersrand Basin is the heart of South Africaa gold mining industry. The cluster of gold mines located in the Witwatersrand Basin generates a significant amount of mine tailings, which have adverse effects on the environment and ecological systems. In addition, disposal costs are very high.

  • The formation of gold deposits in South Africa Geology Page

    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. Although the Witwatersrand has been subject for decades of research, the genesis of gold

  • (PDF) A Review of the Witwatersrand Basin - The Worlds

    The world's greatest deposit of gold is hosted by the Archaean Witwatersrand sedimentary basin, situated in the central portion of the Kaapvaal Craton of South Africa. The geological setting of

  • Scientists Discover That 40 Percent Of The World's Gold Is

    Sep 16, 2002· The new results confirm that the Witwatersrand gold deposits are "placer" deposits -- that millions of years ago, ancient rivers carried gold particles, along with sand and silt, into the

  • WITWATERSRAND METALLOGENESIS: THE CASE FOR

    Inanearlyandremarkablyperceptivework,DeLaunay(1896,p.79) ruled on the question of whether Witwatersrand (WWR) gold was formed either before, at the same time as, or else after the conglomerate. Paraphrasing this, the popular options for origin remain: paleoplacer, synsedimentary, and hydrothermal.

  • The source of Witwatersrand gold: evidence from uraninite

    An in-situ LA-ICP-MS study of different generations of uraninite from the Mesoarchaean Witwatersrand gold palaeoplacer deposits revealed unusually high Au concentrations in rounded, detrital uraninite grains but no detectable Au in secondary, hydrothermally mobilised uraninite. A Au-enriched uraninite-bearing magmatic host is suggested as a significant source for detrital gold in the

  • The formation of gold deposits in South Africa

    Apr 20, 2017· 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.

  • Land Use After Mine Closure Risk Assessment of Gold and

    The gold- and uranium-bearing deposits of the Witwatersrand basin took some 360 Ma to form during the Archaean Period, between 3074 and 2714 Ma ago (Robb and Robb, 1998). In addition to aeons of natural weathering, a hundred and twenty years of mining and mine residue deposition has resulted in

  • The Witwatersrand Basin and Its Gold Deposits SpringerLink

    Feb 21, 2019· The Mesoarchaean Witwatersrand Basin represents the largest known gold anomaly and has produced more gold than any other ore province in the world.

  • Witwatersrand gold deposits formed by volcanic rain

    Feb 02, 2015· 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 the

  • Witwatersrand gold deposits (pdf) Paperity

    Witwatersrand gold deposits D. K. Hall 0 0 Mining Technology Laboratory, Chamber of Mines of South Africa Studies of the morphology and other properties of the gold particles in the fossil placer gold deposits of the Witwatersrand provide fascinating glimpses of

  • Thermal properties of stratified rocks from Witwatersrand

    Witwatersrand gold mining areas. Geological framework The Witwatersrand Basin is one of the oldest well-preserved stratified basins on Earth, its present-day perimeter approximately being defined by the distribution of major gold mines (Figure 1). It contains and is overlain by four Precambrian volcano-sedimentary sequences,

  • A paper on the origins of the original Witwatersrand Gold

    Mar 01, 2018· When George Harrison discovered the Main Reef of gold at Langlaagte farm in 1886, it was believed by many to be an old river that had been turned on its side. They therefore believed the gold could not continue for more than about 30 to 50 meters underground.

  • Quartz-Pebble-Conglomerate Gold Deposits

    Quartz-pebble-conglomerate gold deposits represent the largest repository of gold on Earth, largely due to the depos- its of the Witwatersrand Basin, which account for nearly 40 percent of the total gold produced throughout Earths history. This deposit type has had a

  • The Witwatersrand Basin and Its Gold Deposits: Methods and

    Gold mining in the Witwatersrand Basin has been responsible for the creation of the metropolis of Johannesburg and many thriving mining towns and has had a major influence in the shaping of South

  • Witwatersrand Gold Rush The Famous South African Gold Mine

    The continued mining of gold has firmly placed Johannesburg as the economical powerhouse of South Africa. While the ultimate source of the gold in the Witwatersrand reef is unknown, the general disposition of the deposits is recognizable and continuous. The area has also featured dedicated botanical gardens to help preserve regions of the land.

  • Witwatersrand gold-pyrite-uraninite deposits do not

    Jan 01, 2006· Jonathan Law, Neil Phillips, 2006. "Witwatersrand gold-pyrite-uraninite deposits do not support a reducing Archean atmosphere", Evolution of Early Earth's Atmosphere, Hydrosphere, and Biosphere - Constraints from Ore Deposits, Stephen E. Kesler, Hiroshi Ohmoto

  • Johannesburg Egoli-Goud Witwatersrand ONAFHANKLIK

    Mar 30, 2021· It was established as a small village controlled by a Health Committee in 1886 with the discovery of an outcrop of a gold reef on the farm Langlaagte. Due to the extremely large gold deposit found along the Witwatersrand.

  • WITS GOLD - sharedata.

    Additional prospecting rights for gold and uranium in the southern Free State Goldfield.Wits Gold has now been granted a total of nine prospecting rights in the Witwatersrand Basin Prospecting rights for uranium are currently held only in the southern Free State Goldfield.

  • Scientists Discover That 40 Percent Of The World's Gold Is

    Sep 16, 2002· 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.

  • 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. Although the Witwatersrand has been subject for decades of research, the genesis of gold and uranium ore is

  • Wits 2.0 and Palaeoplacer Gold Deposits Caracle Creek

    Information Circular No. 375 (2003): The debate on the origin of the Witwatersrand Gold (1896-1903). Phillips (1987): Anomalous Gold in Witwatersrand Shales. Piercey (2013): Sedimentary origin of gold and uranium in the Archean Witwatersrand Supergroup, South Africa. CANADA (The Huronian): Inventus Mining Corp.: The Pardo Paleoplacer Gold

  • Hydrothermal alteration in the Witwatersrand goldfields

    Mar 01, 2015· The Witwatersrand goldfields have been the source of ~ 30% of all the gold produced over the last 6000 years, i.e. 50,000 t out of 175,000 t.This is significantly more gold than has been produced from any other basin, province, country or continent ().The attraction of the Witwatersrand gold deposits has been their high tonnage, high gold grade, and the remarkable lateral continuity of

  • Witwatersrand Gold Deposits - Mineral Processing & Metallurgy

    Jul 31, 2019· 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.

  • Gold - Minerals Council South Africa

    The Witwatersrand gold-producing area in South Africa is underlain by an underground geological formation also known as the Witwatersrand Basin. It lies on the Kaapvaal Craton, and is one of the worlds largest gold placer deposits.

  • The impact of gold mining on the Witwatersrand on the

    Jun 15, 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.

  • Witwatersrand Nigel Gold Mine Near Springs, South Africa

    The Witwatersrand Nigel Gold Mine is near Springs, South Africa. The Witwatersrand Nigel Gold Mine is a underground mining operation. Initial production took place in 1940 and overall output was considered to be medium size. Mine operations consist of 2