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The oldest known orogenic gold deposits (>3 Ga) are in the Kaapvaal craton in the Barberton greenstone belt, the Ukrainian Shield and the Pilbara craton. [42] The Witwatersrand placer gold deposit in South Africa is estimated to have been mineralized by orogenic processes at a similar time.
While a number of small gold deposits had been discovered in the northern parts of South Africa between 1840 and 1870, Mac-Mac was the first place where payable quantities of gold were found. [1] In 1873 gold was discovered on the farm Geelhoutboom.
Lode gold deposits, also referred to as orogenic gold are generally high-grade, thin, vein and fault hosted. They are primarily made up of quartz veins also known as lodes or reefs, which contain either native gold or gold sulfides and tellurides. Lode gold deposits are usually hosted in basalt or in sediments known as turbidite, although when ...
Vast deposit of 'white gold' in Arkansas could be stunningly valuable. Elizabeth Weise, USA TODAY. Updated January 17, 2025 at 10:31 AM. A map of the U.S. showing the geological area called the ...
John Stewart MacArthur developed the cyanide process for gold extraction in 1887. The expansion of gold mining in the Rand of South Africa began to slow down in the 1880s, as the new deposits found tended to contain pyritic ore. The gold could not be extracted from this compound with any of the then available chemical processes or technologies. [5]
Carlin Trend, shown with other alignments of sediment-hosted gold deposits in Nevada.Source: USGS. Newmont's Gold Quarry mine in 2009, on the Carlin Trend. The Carlin Unconformity or Carlin Trend is a geologic feature in northeastern Nevada which represents a period of erosion or non-deposition likely associated with a collision between a tectonic crustal block called a terrane and the North ...
The highest-grade samples contained 138 grams of gold per ton of ore, surpassing the typical benchmark of eight grams for high-grade deposits. The initial exploration discovered 300 tons of gold ...
China says it has discovered the world’s largest known deposit of gold, estimated to be worth over $80bn (£63bn).. The deposit at the Wangu goldfield in central China could yield more than ...