File:YogoDryWashing1899.jpg

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YogoDryWashing1899.jpg(200 × 375 pixels, file size: 24 KB, MIME type: image/jpeg)

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Description Washing the sapphire ore by hand, at the English Mine at Yogo mines, Yogo Gulch, Montana, USA. The English Mine was a meandering structure of wooden trestles, tramways, flumes and sluices. High-pressure water jets eroded away weathered sections of rock and clay. The resulting magma, or mud, passed through a series of sluice boxes. In this photograph, miners work the sluices.
Date
Source Gem Gallery, Mindat, Big Sky Journal
Author W. H. Weed, United States Geological Survey
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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:YogoDryWashing1899.jpg
Note: Original Yogo mines were destroyed by floods in 1923

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current00:34, 24 October 2011Thumbnail for version as of 00:34, 24 October 2011200 × 375 (24 KB)PumpkinSky (talk | contribs){{Information |Description= Washing the sapphire ore by hand, at the English Mine at Yogo mines, Yogo Gulch, Montana, USA. The English Mine was a meandering structure of wooden trestles, tramways, flumes and sluices. High-pressure water jets eroded away w

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