File:Gold-quartz-sulfide hydrothermal vein (Winnemucca District, northern Nevada, USA) (16976071879).jpg

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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.
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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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