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- Witwatersrand_Basin abstract "The Witwatersrand Basin is a largely underground geological formation which surfaces in the Witwatersrand, South Africa. It holds the world's largest known gold reserves and has produced over 1.5 billion ounces (over 40,000 metric tons), which represents about 50% of all the gold ever mined on earth. The basin straddles the old provinces of Transvaal and the Orange Free State, and consists of a 5000–7000 m thick layer of Archean, mainly sedimentary rocks laid down over a period of about 260 million years, starting about 3000 million years ago. The entire series of rocks, known as the “Witwatersrand Supergroup’’ consists of quartzites, banded ironstones, mudstones, tillites, conglomerates and some marine lava deposits. Most of the basin is deeply buried under younger rocks, but outcrops occur in Gauteng, the Free State, as well as in some of the surrounding Provinces. The outcrop in Gauteng forms the Witwatersrand ridge, from which the basin and its rocks derive their name. It was on the southern portion of this ridge that gold was first discovered on the farm Langlaagte in 1886, 5 km west of Johannesburg. Since this gold was embedded in a conglomerate, it was first assumed that this was alluvial gold in an old riverbed, that had been tilted as a result of earth movements. However, when it was found that, traced downdip, the conglomerate was not merely developed for the narrow width of a river, but continued in depth, there came the realization that this conglomeratic zone was part of a sedimentary succession. The conglomerate was quickly traced east and westward for a total continuous distance of 50 km to define what became known as the “Central Rand Gold Field”.It has since been established that the rocks that make up the Witwatersrand Ridge dip downwards and southwards to form the largely underground “Witwatersrand Basin” which covers an elliptical area with a 300 km long major axis from Evander in the north-east to Theunissen in the south-west, and 150 km wide stretching from Steynsrus in the south-east to Coligny in the north-west, with a small subsidiary basin at Kinross. Gold occurs only along the northern and western margins of this basin, but not in a continuous band. The gold bearing rocks are limited to 6 sites where Archean rivers from the north and west formed fan deltas, with many braided channels, before flowing into the “Witwatersrand Sea” to the south, where the earlier sediments that form the older rocks of the Witwatersrand Supergroup had been deposited. Some of these gold bearing fan deltas are now at depths of 4 km below the surface.Although many of the older mines, around Johannesburg, are now nearly exhausted, the Witwatersrand Basin still produces most of South Africa's gold and much of the total world output. Silver, uranium, and iridium are recovered as gold-refining by-products.".
- Witwatersrand_Basin thumbnail Carbon_Leader_Gold_Ore,_South_Africa_3.jpg?width=300.
- Witwatersrand_Basin wikiPageExternalLink science?_ob=ArticleURL&_udi=B6V72-48CGKPP-7&_user=10&_coverDate=01%2F01%2F1990&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1467112250&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=b46f960443a1bee1344abf3a416a8bcf&searchtype=a.
- Witwatersrand_Basin wikiPageExternalLink RIVER-MAIN.htm.
- Witwatersrand_Basin wikiPageID "4687832".
- Witwatersrand_Basin wikiPageLength "19091".
- Witwatersrand_Basin wikiPageOutDegree "77".
- Witwatersrand_Basin wikiPageRevisionID "651888543".
- Witwatersrand_Basin wikiPageWikiLink Afrikaans.
- Witwatersrand_Basin wikiPageWikiLink Archean.
- Witwatersrand_Basin wikiPageWikiLink Asphalt.
- Witwatersrand_Basin wikiPageWikiLink Asthenosphere.
- Witwatersrand_Basin wikiPageWikiLink Banded_iron_formation.
- Witwatersrand_Basin wikiPageWikiLink Bitumen.
- Witwatersrand_Basin wikiPageWikiLink Braided_river.
- Witwatersrand_Basin wikiPageWikiLink Category:Geology_of_South_Africa.
- Witwatersrand_Basin wikiPageWikiLink Category:Gold_mining.
- Witwatersrand_Basin wikiPageWikiLink Category:Gold_mining_in_South_Africa.
- Witwatersrand_Basin wikiPageWikiLink Category:Gold_rushes.
- Witwatersrand_Basin wikiPageWikiLink Category:History_of_South_Africa.
- Witwatersrand_Basin wikiPageWikiLink Category:History_of_mining.
- Witwatersrand_Basin wikiPageWikiLink Category:Mining_in_South_Africa.
- Witwatersrand_Basin wikiPageWikiLink Category:South_African_gold_rushes.
- Witwatersrand_Basin wikiPageWikiLink Conglomerate_(geology).
- Witwatersrand_Basin wikiPageWikiLink Crust_(geology).
- Witwatersrand_Basin wikiPageWikiLink Earths_crust.
- Witwatersrand_Basin wikiPageWikiLink Evander,_Mpumalanga.
- Witwatersrand_Basin wikiPageWikiLink Free_State_(province).
- Witwatersrand_Basin wikiPageWikiLink Gauteng.
- Witwatersrand_Basin wikiPageWikiLink Geography_of_South_Africa.
- Witwatersrand_Basin wikiPageWikiLink Gold.
- Witwatersrand_Basin wikiPageWikiLink Granite.
- Witwatersrand_Basin wikiPageWikiLink Granites.
- Witwatersrand_Basin wikiPageWikiLink Great_Escarpment,_Southern_Africa.
- Witwatersrand_Basin wikiPageWikiLink Great_Oxygenation_Event.
- Witwatersrand_Basin wikiPageWikiLink Greenstone_belt.
- Witwatersrand_Basin wikiPageWikiLink Greenstone_belts.
- Witwatersrand_Basin wikiPageWikiLink Highveld.
- Witwatersrand_Basin wikiPageWikiLink Iridium.
- Witwatersrand_Basin wikiPageWikiLink Iron_pyrite.
- Witwatersrand_Basin wikiPageWikiLink Island_arc.
- Witwatersrand_Basin wikiPageWikiLink Island_arcs.
- Witwatersrand_Basin wikiPageWikiLink Isotope.
- Witwatersrand_Basin wikiPageWikiLink Johannesburg.
- Witwatersrand_Basin wikiPageWikiLink Kaapvaal_Craton.
- Witwatersrand_Basin wikiPageWikiLink Kaapvaal_craton.
- Witwatersrand_Basin wikiPageWikiLink Kerogen.
- Witwatersrand_Basin wikiPageWikiLink Kinross,_Mpumalanga.
- Witwatersrand_Basin wikiPageWikiLink Komatiite.
- Witwatersrand_Basin wikiPageWikiLink Lava.
- Witwatersrand_Basin wikiPageWikiLink Mantle_(geology).
- Witwatersrand_Basin wikiPageWikiLink Meteorite.
- Witwatersrand_Basin wikiPageWikiLink Mudstone.
- Witwatersrand_Basin wikiPageWikiLink Orange_Free_State.
- Witwatersrand_Basin wikiPageWikiLink Orogenesis.
- Witwatersrand_Basin wikiPageWikiLink Orogeny.
- Witwatersrand_Basin wikiPageWikiLink Osmium.
- Witwatersrand_Basin wikiPageWikiLink Pyrite.
- Witwatersrand_Basin wikiPageWikiLink Quartzite.
- Witwatersrand_Basin wikiPageWikiLink Rhenium.
- Witwatersrand_Basin wikiPageWikiLink River_delta.
- Witwatersrand_Basin wikiPageWikiLink River_deltas.
- Witwatersrand_Basin wikiPageWikiLink Silver.
- Witwatersrand_Basin wikiPageWikiLink South_Africa.
- Witwatersrand_Basin wikiPageWikiLink Strike_and_dip.
- Witwatersrand_Basin wikiPageWikiLink Structure_of_the_Earth.
- Witwatersrand_Basin wikiPageWikiLink Theunissen.
- Witwatersrand_Basin wikiPageWikiLink Till.
- Witwatersrand_Basin wikiPageWikiLink Tillite.
- Witwatersrand_Basin wikiPageWikiLink Tonne.
- Witwatersrand_Basin wikiPageWikiLink Transvaal_Province.
- Witwatersrand_Basin wikiPageWikiLink Tungsten.
- Witwatersrand_Basin wikiPageWikiLink Uraninite.
- Witwatersrand_Basin wikiPageWikiLink Uranium.
- Witwatersrand_Basin wikiPageWikiLink Vredefort_crater.
- Witwatersrand_Basin wikiPageWikiLink Witwatersrand.
- Witwatersrand_Basin wikiPageWikiLink Zimbabwe_Craton.
- Witwatersrand_Basin wikiPageWikiLink Zimbabwe_craton.
- Witwatersrand_Basin wikiPageWikiLink File:Cape-Vaal_Craton.png.
- Witwatersrand_Basin wikiPageWikiLink File:Carbon_Leader_Gold_Ore,_South_Africa_3.jpg.
- Witwatersrand_Basin wikiPageWikiLink File:Earths_geolological_timeline.svg.
- Witwatersrand_Basin wikiPageWikiLink File:Gold-rl-1293b.jpg.
- Witwatersrand_Basin wikiPageWikiLink File:Iron_banding_01.jpg.
- Witwatersrand_Basin wikiPageWikiLink File:Vredefort_crater_cross_section_2.png.
- Witwatersrand_Basin wikiPageWikiLink File:Witwatersrand_outcrops_2.jpg.
- Witwatersrand_Basin wikiPageWikiLinkText "Witwatersrand Basin".
- Witwatersrand_Basin wikiPageWikiLinkText "Witwatersrand".
- Witwatersrand_Basin wikiPageWikiLinkText "largest deposit".
- Witwatersrand_Basin hasPhotoCollection Witwatersrand_Basin.
- Witwatersrand_Basin wikiPageUsesTemplate Template:Coord.
- Witwatersrand_Basin wikiPageUsesTemplate Template:EngvarB.
- Witwatersrand_Basin wikiPageUsesTemplate Template:Reflist.
- Witwatersrand_Basin wikiPageUsesTemplate Template:Use_dmy_dates.
- Witwatersrand_Basin subject Category:Geology_of_South_Africa.
- Witwatersrand_Basin subject Category:Gold_mining.
- Witwatersrand_Basin subject Category:Gold_mining_in_South_Africa.
- Witwatersrand_Basin subject Category:Gold_rushes.
- Witwatersrand_Basin subject Category:History_of_South_Africa.
- Witwatersrand_Basin subject Category:History_of_mining.
- Witwatersrand_Basin subject Category:Mining_in_South_Africa.