U.S. Geological Survey Photographic Library
ID. Jackson, W.H. 62
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. A flume is laid upon the bedrock, in the bottom of the gulch, and the waters of the creek brought through it, carrying with its current the auriferous sands. Madison County, Montana. 1871.
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