U.S. Geological Survey Photographic Library

ID. Gilbert, G.K. 3395

Hydraulic mining pits at North Columbia, The pit in the foreground is known as

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.

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