The general correspondence (1888-1899) in this collection consists of incoming, interoffice, and outgoing correspondence, filed together. Telegrams (1894-1898) are filed separately. In addition, there are financial records (1888-1898), including payrolls, supply lists, trial balances, vouchers, and other materials; organizational records (1898-1899); production records (1888-1896); and legal documents (1891). The W.A. Akers letterpress book (1888-1889) contains detailed letters from the mine manager to company officials in Butte, describing day-to-day operations, including an account of the fire of 1889 which destroyed much of the town of Black Pine.