Records, 1845-2003, of the Adventure Mining Company, the Adventure Copper Company, the Adventure Consolidated Copper Company, and the modern Adventure Mining Company in Ontonagon County, Michigan. Includes company reports, claims, correspondence, permits, contracts, payroll books, clippings, maps, and other printed ephemera.

Records, 1845-2003, of the Adventure Mining Company, the Adventure Copper Company, the Adventure Consolidated Copper Company, and the modern Adventure Mining Company in Ontonagon County, Michigan. Includes company reports, claims, correspondence, permits, contracts, payroll books, clippings, maps, and other printed ephemera.

Records, 1845-2003, of the Adventure Mining Company, the Adventure Copper Company, the Adventure Consolidated Copper Company, and the modern Adventure Mining Company in Ontonagon County, Michigan. Includes company reports, claims, correspondence, permits, contracts, payroll books, clippings, maps, and other printed ephemera.