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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Summary
| Description |
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. |
| Date | |
| 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 |
| Other versions | view of flip side |
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This image, originally posted to , who confirmed that it was available on Flickr under the stated license on that date. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:47, 12 September 2014 | | 570 × 485 (327 KB) | Tillman | Cropped 45 % horizontally and 45 % vertically using CropTool with lossless mode. |
| 19:46, 12 September 2014 |  | 1,028 × 888 (655 KB) | Tillman | Transferred from Flickr via Flickr2commons |
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