Records consist primarily of interoffice correspondence (1903-1923) and general correspondence (1903-1925). Correspondents in the home office in St. Louis include Paul A. Fusz, president; George S. Zehnder, secretary; and Charles G. Ewing, president after the death of Fusz in 1910. Major correspondents in the general office files include companies supplying equipment; mine foremen Peter F. Scherr (1907), Sam L. Clark (1908), Joseph Sorenson (1909-1910), and Charles Campp (1916); surveyor E.A. Cralle; the Forest Service; and the U.S. Land Office in Missoula. There is a file for an appeal (1907) of a U.S. Land Office ruling concerning the company's mineral entry. Financial records include assay reports, scattered bills and invoices, orders for supplies, bank deposits, time checks, etc. There is one accident report for an injured employee.