Датотека:Gold-quartz placer nugget, Lead SD.jpg
Gold-quartz_placer_nugget,_Lead_SD.jpg (570 × 485 piksela, veličina datoteke: 327 kB, MIME tip: image/jpeg)
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Opis izmene
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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. |
| Datum | |
| Izvor | 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 |
| Autor | James St. John |
| Ostale verzije | view of flip side |
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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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| Datum/vreme | Minijatura | Dimenzije | Korisnik | Komentar | |
|---|---|---|---|---|---|
| trenutna | 21:47, 12. septembar 2014. | | 570 × 485 (327 kB) | Tillman | Cropped 45 % horizontally and 45 % vertically using CropTool with lossless mode. |
| 21:46, 12. septembar 2014. |  | 1.028 × 888 (655 kB) | Tillman | Transferred from Flickr via Flickr2commons |
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