File:North Star gold ore.jpg

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Description
English: Photographs of ore: Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1 vein, 8,200-foot level. Nevada County, California. 1931. Plate 11-A, U.S.Geological Survey Professional paper 194. 1940.
Date
Source http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Johnston,%20W.D.,%20Jr.%20%2089&SIZE=medium
Author U.S.Geological Survey Professional paper 194. 1940.
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Date/TimeThumbnailDimensionsUserComment
current03:30, 2 April 2012Thumbnail for version as of 03:30, 2 April 2012889 × 1,400 (657 KB)Tillman{{Information |Description ={{en|1=Photographs of ore: Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1 vein, 8,200-foot level. Nevada County, California. 1931. Plate 11-A, U.S.Geological Survey Professional paper 194. 1940...
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