File:Gold ore (Camp Bird Vein, Tertiary; Camp Bird Mine, San Juan Mountains, Colorado, USA) 3.jpg
Original file (4,000 × 2,138 pixels, file size: 5.22 MB, MIME type: image/jpeg)
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Summary
[edit]DescriptionGold ore (Camp Bird Vein, Tertiary; Camp Bird Mine, San Juan Mountains, Colorado, USA) 3.jpg |
English: Gold ore from the Tertiary of Colorado, USA. (cut surface)
This is a rare gold ore sample from the Camp Bird Mine in Colorado's San Juan Mountains. The rock is dominated by quartz, which is often stained grayish to blackish. Golden brassy-colored chalcopyrite (CuFeS2, iron copper sulfide) is present as small patches. Some small areas of green malachite and blue azurite are present. Clusters of tiny specks of native gold occur throughout the rock, often in the darkest-colored quartz. Under the microscope, the color and luster of the chalcopyrite and native gold are almost identical, but the native gold is very slightly more lustrous. Many of the chalcopyrite patches have rinds of brown iron oxide (possibly goethite). An undetermined mineral with metallic. luster and silvery-gray color is also present as clusters of tiny specks - probably a sulfide mineral. This rock comes from the Camp Bird Vein, an almost east-west trending, 68° to 70° south-dipping hydrothermal vein hosted in Tertiary volcanic rocks of the San Juan Volcanic Field. Age of mineralization: possibly similar to the age of other gold-bearing veins in the area (e.g., Argentine Vein), which is Early Miocene (~17 Ma) Provenance: pile of vintage gold ore found below the Camp Bird Mine's Chicago Tunnel, atop a decomposed canvas bag (possibly dropped long ago on its way down to a tram station and mill) Locality: Chicago Level, Camp Bird Mine, Camp Bird Mining District, ~east-northeast of the town of Telluride & southwest of the town of Ouray, San Juan Mountains, southwestern Colorado, USA See info. at: www.mindat.org/loc-8702.html and en.wikipedia.org/wiki/Camp_Bird_Mine |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50681335801/ |
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@N05/50681335801. It was reviewed on 11 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
11 December 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:21, 11 December 2020 | 4,000 × 2,138 (5.22 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50681335801/ 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 | 1/250 sec (0.004) |
F-number | f/3.5 |
ISO speed rating | 80 |
Date and time of data generation | 16:53, 3 December 2020 |
Lens focal length | 9.681 mm |
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 18.0 (Macintosh) |
File change date and time | 20:58, 3 December 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 16:53, 3 December 2020 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.96875 |
APEX aperture | 3.625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 15:58, 3 December 2020 |
Unique ID of original document | 46F09DEBB0BA1B0F343EB8DEEB0A2168 |