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File:Gold-quartz placer nugget (derived from auriferous Precambrian basement rocks; Elk Creek, west of Rt. 285, southeast of the town of Lead, northern Black Hills, western South Dakota, USA) 2 (15025717909).jpg

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Gold-quartz placer nugget (1 cm across) from the Black Hills of South Dakota, USA.

This is a modern fluvial pebble composed of native gold (Au) and quartz (SiO2). The gold is ultimately derived from auriferous Precambrian basement rocks in the area of Lead, South Dakota. The now-inactive Homestake Mine, America's largest gold mine, is located in Lead (pronounced "Leed").

Gold masses that accumulate in river or stream gravels, or get trapped in fractures in bedrock-floored rivers, are called placer deposits - such gold is called placer gold.

Locality: Elk Creek, west of Rt. 385, southeast of the town of Lead, northern Black Hills, western South Dakota, USA.
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Source Gold-quartz placer nugget (derived from auriferous Precambrian basement rocks; Elk Creek, west of Rt. 285, southeast of the town of Lead, northern Black Hills, western South Dakota, USA) 2
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15025717909. It was reviewed on 6 April 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 April 2015

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current20:35, 6 April 2015Thumbnail for version as of 20:35, 6 April 20151,160 × 936 (737 KB)Jacopo Werther (talk | contribs)Transferred from Flickr via Flickr2Commons

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