The records of the Western Union Mining Company span the years 1916-1951, with the bulk of the material covering the years 1922-1947. Included are minutes of meetings and related material, general correspondence with stockholders and suppliers, annual statements and reports to state agencies, records relating to stock assessments and transfers, stock ledgers and a stock journal, financial ledgers and other related material, records of silver shipments, assays and ore settlements, and employee time books and payrolls.