File:Auriferous altered mudshale with contorted bedding (Carlin-type gold ore) (Turqoise Ridge Gold Ore, Nevada, USA) 3.jpg
Original file (3,058 × 2,444 pixels, file size: 5.27 MB, MIME type: image/jpeg)
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Summary
editDescriptionAuriferous altered mudshale with contorted bedding (Carlin-type gold ore) (Turqoise Ridge Gold Ore, Nevada, USA) 3.jpg |
English: Gold ore from Nevada, USA. (cross-section view)
This is an example of Carlin-type gold ore, a famous category of gold deposits in northern Nevada. Much of America's gold production is from these deposits. About 200 million ounces of gold have been produced from a 200 x 300 kilometer area in northern Nevada. Carlin-type gold deposits are hosted in sedimentary rocks and contain very finely disseminated gold. The gold is not visible (Au masses occur at the micron scale), but the gold content is high enough to make mining economic. Carlin-type gold ore rocks in northern Nevada are silicified and decalcified. The fluids responsible for this traveled along major normal faults in Nevada’s Basin and Range Province. The same fluids also introduced the gold into the rocks. Gold mineralization in this particular area occurred 39 million years ago, during the late Middle Eocene. Seen here is a scarce example of Turquoise Ridge gold ore, from the Turguoise Ridge Mine of Nevada, which is immediately adjacent to the class Getchell Mine. This Carlin-type gold ore is an auriferous altered mudshale derived from the Lower Ordovician Comus Formation. Notice the contorted bedding - this is post-depositional, soft-sediment deformation. The rock has been decalcified and weakly silicified. There’s no visible gold - it’s all finely disseminated. The ore grades out to about 0.35 ounces of gold per ton of rock. Locality: >2000” depth, HGB3150 area of the Turquoise Ridge Mine, eastern side of the northern end of the Osgood Mountains, northeast of Winnemucca, Potosi Mining District, eastern Humboldt County, northern Nevada, USA (41º 12’ 30” North latitude, 117º 15’ 10” West longitude) |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/43602367200/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/43602367200. It was reviewed on 15 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
15 November 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:48, 15 November 2020 | 3,058 × 2,444 (5.27 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/43602367200/ with UploadWizard |
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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/9 |
ISO speed rating | 80 |
Date and time of data generation | 12:04, 11 October 2018 |
Lens focal length | 7.23 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 22:51, 18 October 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 12:04, 11 October 2018 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:51, 18 October 2018 |
Unique ID of original document | EFC234A2E86D0F939AA54BA6529524BD |
IIM version | 18,755 |