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 "The Consolidated"; in the distance, at left, is the "Union Diggings"; at right the "Sailor Flat" nine. Nevada County, California, n.d.
Image file: /htmlorg/lpb179/land/ggk03395.jpg