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File:Gold-quartz placer nugget, Lead SD.jpg

Gold-quartz_placer_nugget,_Lead_SD.jpg ‎(570 × 485 pixels, file size: 327 KB, MIME type: image/jpeg)

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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) 1
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, originally posted to Flickr, was reviewed on 16 September 2014 by the administrator or reviewer Leoboudv, who confirmed that it was available on Flickr under the stated license on that date.

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Date/TimeThumbnailDimensionsUserComment
current19:47, 12 September 2014Thumbnail for version as of 19:47, 12 September 2014570 × 485 (327 KB)Tillman (talk | contribs)Cropped 45 % horizontally and 45 % vertically using CropTool with lossless mode.
19:46, 12 September 2014Thumbnail for version as of 19:46, 12 September 20141,028 × 888 (655 KB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

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