The gold and mineral rich layers were displaced downwards like the saucer of a cup, the ‘hinge, being along the Witwatersrand ridge and sloping downwards at angles around 30 degrees at surface and curving out as deep as six km underground. Witwatersrand accounts for roughly 50 percent of the gold ever mined. By the end of the following year, in 1888, the number of companies had dropped down to 39, only to rise up again to 52 by the end of 1889. It may in fact have been an ice-comet as no remains were found, the ice melting instantly under fantastically high temperatures. Much More than a Mafia: Mavericks, Mentors, and Medical Maestros. The original miners' camp, under the informal leadership of Col Ignatius Ferreira, had been located in the Fordsburg dip, possibly because water was available there, and because of the site's close proximity to the diggings. Coming up from deep underground were sulphurs common to volcanic vents, and iron rich muds, along with the elements already mentioned, such as gold, silver et al. So over the years the layers built up, one on top of another. The outcrop in Gauteng forms the Witwatersrand ridge, from which the basin and its rocks derive their name. Contribute. That the meteor came in at an angle, from the South, is demonstrated by the Witwatersrand ridge being most disturbed and deformed, to the North of impact. Thus, within a short time, the mining town's rapid growth began to overtax its infrastructure to a degree that it also created problems in other areas, such as its supply of potable water. The first recorded discovery of gold on the Witwatersrand was made by Jan Gerrit Bantjes in June 1884, on the farm Vogelstruisfontein, and was followed soon thereafter, in September, by the Struben brothers who uncovered the Confidence Reef on the farm Wilgespruit, near present-day Roodepoort. A heavy in-migration of miners followed, and the city of Johannesburg grew near the centre of the Witwatersrand. Initially these men came from Mozambique, but later on they were also drawn from British colonies further afield. Today this can be seen at the Roodepoort Botanical Gardens where a cliff face exposes these layers. Mining has been taking place within … The rise of population numbers thereafter can only be described as phenomenal, following an exponential growth pattern for virtually all sectors of the population. Can anyone tell me where this building in East London is? As a result, the initial survey and layout of the settlement was made with impermanence in mind. By this time it had been realized that the Reef extended not only to the east and west, but also downwards with persisting values of ore. At the time mineral outputs averaged £1 per oz per ton of rock mined. 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. These springs, heated to boiling far underground where water came into contact with hot rock in turn heated by lavas from the Rietfontein series of faults, carried iron-rich mud. Meteorite Impact, by W.U. 375 (2003): The debate on the origin of the Witwatersrand Gold (1896-1903). These minerals, mixed with quartz rock and other debris, formed layers of iron-rich conglomerate. These gold fields dominated production throughout the twentieth century, but production peaked at … Following upon the declaration of Johannesburg, this area was taken over by the Government who had it surveyed and named it Ferreira’s Town. And again under tremendous heat, this split into Iron Pyrite and water. Does anyone have information about this fascinating auction lot bought in the UK? 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