The collection consists of the records of the Granite-BiMetallic Consolidated Mining Company and its two predecessor companies. It is divided into three subgroups: one for the Granite Mountain Mining Company, one for the Bi-Metallic Mining Company, and one for the consolidated company. Records include interoffice correspondence (1887-1931) between the offices in St. Louis and the mine offices in Philipsburg. This correspondence is very detailed about the day-to-day operations of the three companies. Correspondents include John T. Field, Lewis M. Rumsey, Thomas O. Hyman, Paul A. Fusz, Thomas Weir, James Henley, Werner Ziegler, Charles Clark, Alf. H. White, J.B. Risque, W. Thomas Hart, E.I. Holland, C. Jagels, George S. Zehnder, Charles D. McLure, John R. Lucas, Joseph Yob, and Leigh Wyman. In addition there is incoming correspondence (1887-1894) from equipment suppliers and others; outgoing correspondence (1881-1903) in letterpress books; and general correspondence (1898-1932). Court papers (1889-1915) include records of several court cases involving the companies. Employment records (1883-1893) include accident reports, assignments of wages, payrolls, and timebooks. There are only scattered financial records (1883-1931). Legal documents (1881-1930) include abstracts of title, contracts, a real estate record, lease records, notices of water rights, etc. Organizational records (1886-1922) include articles of incorporation, annual reports, minutes, and lists of stockholders. Production records (1884-1894) include assay reports, distribution of labor, mill and tramway reports, mine production reports, etc. One of the largest series consists of weekly reports (1884-1917) of superintendents F.L. Perkins, John W. Plummer, Paul A. Fusz, Thomas Weir, James Risque, Werner Ziegler, John R. Lucas; and of foremen James Willoughby, M.E. Blanger, C. Brusnahan, Julius Weigenstein, and Richard Trebilcock. These reports provide a weekly summary of exploration work, mine development, and production. In addition there are subject files on a bullion theft case (1899-1902), the salt chloride leaching plant (1909), oxy-acetylene welding, and sale of second hand machinery; as well as miscellany, including field survey books (1901-1934), advertisements from equipment suppliers, specifications of machinery and other topics.