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[edit]
DescriptionGold-quartz placer nugget, Lead SD.jpg |
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 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/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:47, 12 September 2014 | 570 × 485 (327 KB) | Tillman (talk | contribs) | Cropped 45 % horizontally and 45 % vertically using CropTool with lossless mode. | |
19:46, 12 September 2014 | 1,028 × 888 (655 KB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 00:05, 3 July 2012 |
Lens focal length | 11.6 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:56, 11 September 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 00:05, 3 July 2012 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.9068905902692 |
APEX aperture | 6.918863261944 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905405405 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 1,028 px |
Image height | 888 px |
Date metadata was last modified | 17:56, 11 September 2014 |
IIM version | 2 |