This collection contains incoming, interoffice, and outgoing correspondence, employment records, financial records, legal documents, minutes, organizational records, printed materials, and reports. The correspondence (1906-1923) does not provide much information about the company operations, rather it is dominated by legal/property-related correspondence. The Financial Records (1906-1923), consisting of ledgers, journals, cashbooks, and invoices, provide the only means of reconstructing the mining operations, since there are no production records or engineering reports. The Legal Document records (1906-1923) include--mining claims, deeds, titles, contracts, leases, water rights, and wills/probates--which do document the creation of a corporation but do not shed any light on operations. The same applies to the Organization series, which includes stock certificates, stockholder ledgers, and articles of incorporation, but tells the researcher nothing about the daily operations of the company. There are fourteen separate small subgroups, consisting of a variety of personal papers and organizational records for other companies. The subgroups include A.K. Andersen (1913-1917), B.P.O.E. (1924-1950), Buffalo Mining Company (1915-1917), Calumet Clinton Copper Company (1909), Patsy H. Duffy (1913), East Clinton Townsite Company (1901), Harry Y. Gephart (1898-1922), O. P. Jackson (1898-1911), Hiram Knowles (1911), V. Sherwood Kutchin (1909-1913), David Lagasse (1911), Missoula Metal Milling Company (1913), Ray-Jefferson Mining Company (1910), Ten Doy Mining Company (1915), and John Wood (1908-1912).