H.C. Warwick magnesite mines two and one-half miles northeast of Madrone. Inside large pit showing character of deposit near surface. Santa Clara County, California. September 4, 1917. Courtesy U.S. Geological Survey. The USGS home page is http://www.usgs.gov.
This photograph is by carnkie and was uploaded December 14th 2009. © carnkie please do not copy or distribute without prior express permission.
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