File:Auriferous opalite, Vulcan Mine, Colorado 2 (14550787507).jpg
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[edit]DescriptionAuriferous opalite, Vulcan Mine, Colorado 2 (14550787507).jpg |
Auriferous opalite from the Vulcan Mine, southern Gunnison County, southwestern Colorado, USA (~38º 20’ 37” North, ~107º 00’ 26” West) (Colorado School of Mines Geology Museum public display, Golden Colorado, USA). This is a rare, vintage sample of gold ore from Gunnison County, Colorado's Vulcan Mine (next to the Mammoth Chimney Mine & Good Hope Mine). The mining area is at the “town” of Vulcan, north of the Iron Hill Carbonatite Complex and south of the eastern end of the Blue Mesa Reservoir (= dammed Gunnison River). Little geologic literature appears to be available on the geology of the Vulcan Mine. The specimen shown below was the subject of a short article published in 1898. The grayish & purplish-gray banded portions of the rock were identified by Lakes (1898 - Ores of the Vulcan Mine. Mines and Minerals 18: 562-563) as opalite (opal rock, composed of hydrous silica - SiO2·nH2O). Another source of information suggests that the banded areas are cryptocrystalline quartz (SiO2) - chert. Peripheral to the banded rock is breccia. Finely-disseminated native gold (and/or gold telluride?) occurs throughout the rock. |
Date | |
Source | Auriferous opalite, Vulcan Mine, Colorado 2 |
Author | James St. John |
Other versions | File:Auriferous opalite, Vulcan Mine, Colorado 1 (14550601619).jpg |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14550787507. It was reviewed on 1 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
1 August 2014
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current | 06:02, 30 July 2014 | ![]() | 3,008 × 2,000 (5.14 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.6 |
Date and time of data generation | 11:55, 25 July 2007 |
Lens focal length | 170 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 19:07, 24 July 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:55, 25 July 2007 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
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Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 10 |
DateTimeOriginal subseconds | 10 |
DateTimeDigitized subseconds | 10 |
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Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
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Supported Flashpix version | 1 |
Image width | 3,008 px |
Image height | 2,000 px |
Date metadata was last modified | 15:07, 24 July 2014 |