File:Gold-quartz-sulfide hydrothermal vein (Winnemucca District, northern Nevada, USA) (16976071879).jpg
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[edit]DescriptionGold-quartz-sulfide hydrothermal vein (Winnemucca District, northern Nevada, USA) (16976071879).jpg |
Gold-quartz-sulfide hydrothermal vein from Nevada, USA. (public display, Leadville Mining Museum, Leadville, Colorado, USA) This is a gold ore sample from Nevada's Winnemucca Mining District, which refers to mines at Winnemucca Mountain northwest of the town of Winnemucca itself. The whitish-gray material is quartz (SiO2 - silicon dioxide). The metallic yellowish material is native gold (Au). The dark gray material is a sulfide mineral. Sulfide minerals in the hydrothermal veins at the Winnemucca District include pyrite (FeS2 - iron sulfide), chalcopyrite (CuFeS2 - copper iron sulfide), sphalerite (ZnS - zinc sulfide), arsenopyrite (FeAsS - iron arsenic sulfide), and tetrahedrite ((Cu,Fe)12Sb4S13 - copper iron antimony sulfide). Winnemucca Mountain hydrothermal veins intrude Upper Triassic sedimentary rocks, some of which have been slightly metamorphosed (e.g., limestones and hornfels of the Winnemucca Formation and slates of the Rasberry Formation). Locality: Winnemucca District, northern Nevada, USA Geologic info. mostly synthesized from: Bonham et al. (1985) - A mineral inventory of the Paradise-Denio and Sonoma-Gerlach Resource Areas, Winnemucca District, Nevada. Nevada Bureau of Mines and Geology Open File Report 85-3. Koschmann & Bergendahl (1968) - Principal gold-producing districts of the United States. United States Geological Survey Professional Paper 610. 283 pp. |
Date | |
Source | Gold-quartz-sulfide hydrothermal vein (Winnemucca District, northern Nevada, USA) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/16976071879. It was reviewed on 3 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
3 May 2015
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F-number | f/5.6 |
ISO speed rating | 500 |
Date and time of data generation | 18:03, 29 July 2007 |
Lens focal length | 200 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 20:08, 15 April 2015 |
Y and C positioning | Centered |
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Exif version | 2.21 |
Date and time of digitizing | 18:03, 29 July 2007 |
Meaning of each component |
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APEX exposure bias | 0 |
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File source | Digital still camera |
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Focal length in 35 mm film | 300 mm |
Scene capture type | Standard |
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Sharpness | Normal |
Subject distance range | Unknown |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Serial number of camera | 1004a0cc |
Date metadata was last modified | 16:08, 15 April 2015 |
Unique ID of original document | 6DEC2FC3B5CFC5B5780ADCDF3A923BDA |