I.B. MINING CO. Bannack District. Beaverhead County. Minerals Yearbook 1932-33. Page 23. Started to work the Sleeping Princess group near Bannack in March 1931 continued operations throughout 1932.
WPA, "I.B. Mining Company" (1932). Minerals Yearbook, All. 1043.
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I.B. Mining Company, Bannack District, Beaverhead County, Sleeping Princess, Bannack