U.S. Geological Survey Photographic Library
ID. Jackson, W.H. 61
Hydraulic mining near Virginia City. Alder Gulch is 16 miles in length, rising in the mountains near Madison river at an altitude of 7,500 feet. The view shows the manner of washing away the sides of the gulch into the sluice-boxes, where the gold is collected. Madison County, Montana. 1871.
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