File:Auriferous opalite, Vulcan Mine, Colorado 1 (14550601619).jpg
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Summary
[edit]DescriptionAuriferous opalite, Vulcan Mine, Colorado 1 (14550601619).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 1 |
Author | James St. John |
Other versions | File:Auriferous opalite, Vulcan Mine, Colorado 2 (14550787507).jpg |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14550601619. 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 | 2,988 × 1,663 (4.13 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.3 |
Date and time of data generation | 11:55, 25 July 2007 |
Lens focal length | 75 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 19:06, 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 | 4.7 APEX (f/5.1) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 90 |
DateTimeOriginal subseconds | 90 |
DateTimeDigitized subseconds | 90 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 112 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 2,988 px |
Image height | 1,663 px |
Date metadata was last modified | 15:06, 24 July 2014 |