File:Auriferous brecciated quartz-adularia rhyolite (Sleeper Rhyolite Gold Ore, Nevada) 2 (14739423003).jpg

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Captions

Bonanza gold ore from the Sleeper Mine, in brecciated quartz-adularia rhyolite.

Summary

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Description

High-grade gold ore (bonanza-grade gold ore) (field of view ~4.0 cm across) from the Sleeper Open-Pit Mine (section 21, T40N, R35E), eastern side of Sod House Road, south of Rt. 140, northwestern margin of the Slumbering Hills, eastern margin of Desert Valley, northwest of the town of Winnemucca, central Humboldt County, northern Nevada, USA (41° 20’ 24” North, 118° 02” 58” West).

Geology - auriferous quartz-adularia rhyolite (some consider this rock to be a latite). Native gold (Au) occurs in this rock as colloform bands, partially replaces breccia clasts, and also disseminated in the matrix. Published research indicates that Sleeper Mine rocks represent an ancient epithermal gold deposit (hot springs gold deposit), formed by volcanism during Basin & Range extensional tectonics.

Age - the Sleeper Rhyolite dates to 16.3-16.5 million years (latest Early Miocene), and the gold mineralization dates to about 14.3-15.8 million years (during the early Middle Miocene).
Date
Source Auriferous brecciated quartz-adularia rhyolite (Sleeper Rhyolite Gold Ore, Nevada) 2
Author James St. John
Other versions File:Auriferous brecciated quartz-adularia rhyolite (Sleeper Rhyolite Gold Ore, Nevada) 1 (14719259472).jpg

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14739423003. 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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current06:16, 30 July 2014Thumbnail for version as of 06:16, 30 July 20143,008 × 2,000 (2.84 MB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

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