Articles of association, 1897; correspondence, 1897-1899; letter books, 1898-1906 (including Herbert C. Hoover's letter book, 1898-1899, kept while he was Superintendent of Mines); reports, 1898-1963; minute books, 1951-1964; assay records and returns, 1900-1964; files, 1898-1966; financial records; share registers; map; plans; photographs; share registers; tables of use and condition of winding ropes, 1923-1955; receiver and manager accounts for liquidation of company, 1964.