File:Auriferous, uraninitic, hydrocarbon-rich stromatolite rock (Carbon Leader Gold Ore) (Witwatersrand Supergroup, ~2.9 Ga; Blyvooruitzicht Gold Mine, South Africa) 3 (14533130120).jpg

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Gold ore from the Precambrian of South Africa.

Black = uraninite (UO2) Gold = native gold (Au)

The Witwatersrand area of South Africa produces a significant percentage of the world's gold. This is a spectacular sample of Precambrian high-grade gold ore from South Africa’s Blyvooruitzicht Gold Mine. The rock is from the Carbon Leader (also known as the Carbon Leader Reef & Carbon Leader Seam), a blackened, hydrocarbon-rich stromatolitic interval richly impregnated with native gold (Au) and radioactive uraninite/pitchblende (UO2). This is a paleoplacer deposit, part of an ancient alluvial fan succession.

Stratigraphy & Age: Carbon Leader Member, Main Conglomerate, lower Johannesburg Subgroup, lower Central Rand Group, Witwatersrand Supergroup, lower Neoarchean, ~2.9 billion years old.

Locality: Blyvooruitzicht Gold Mine, Carletonville Goldfield, West Witwatersrand (“West Wits”), South Africa.
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Source Auriferous, uraninitic, hydrocarbon-rich stromatolite rock (Carbon Leader Gold Ore) (Witwatersrand Supergroup, ~2.9 Ga; Blyvooruitzicht Gold Mine, South Africa) 3
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14533130120 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2019

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Date/TimeThumbnailDimensionsUserComment
current05:44, 5 December 2019Thumbnail for version as of 05:44, 5 December 20191,396 × 1,219 (1.03 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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