File:Auriferous opalite, Vulcan Mine, Colorado 2 (14550787507).jpg
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| Description |
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 file is licensed under the Creative Commons Attribution 2.0 Generic license.
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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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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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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