Washing out gold using hydraulic mining equipment in the Salmon River Country, Lemhi County, Idaho. Hydraulic mining was done alongside mountains and riverbank.
Borah, William Edgar, 1965-1940. --Boise (Idaho)-Commerce-History-Sources.
Correspondence, organization records, and minutes of the Idaho State Chamber of Commerce. Also includes minutes of the William E. Borah Memorial Association (1944) and the booklet, "244 ways of using Idaho products."