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File:Carbon Leader Gold Ore, South Africa 3.jpg

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Description

Carbon Leader Gold Ore with gold (Au) and uraninite (UO2) (black). This rock is quite radioactive.

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.
Date
Source Auriferous, uraninitic, hydrocarbon-rich stromatolite rock (Carbon Leader Gold Ore, South Africa) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14533130120. It was reviewed on 1 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

1 August 2014

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22 July 2014

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current22:30, 30 July 2014Thumbnail for version as of 22:30, 30 July 20141,396 × 1,219 (254 KB)TillmanTransferred from Flickr via Flickr2commons

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