Hydraulic mining pits at North Columbia, The pit in the foreground is known as "The Consolidated"; in the distance, at left, is the "Union Diggings"; at right the "Sailor Flat" nine. Nevada County, California, n.d. Courtesy U.S. Geological Survey. The USGS home page is http://www.usgs.gov
This photograph is by carnkie and was uploaded January 9th 2010. © carnkie please do not copy or distribute without prior express permission.
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