A flume used in placer mining at Brown’s Flat, California, 1870s. Courtesy of Society of California Pioneers. (Source: oac.cdlib.org)

Photograph of a flume used in placer mining at Brown's Flat, California, 1870s. Courtesy of Society of California Pioneers. (Source: oac.cdlib.org)

A flume used in placer mining at Brown’s Flat, California, 1870s. Courtesy of Society of California Pioneers. (Source: oac.cdlib.org)

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