Administrative records, correspondence, Superfund work plans and proposals, media coverage, litigation documents, financial records, personnel information and stockholder records.

Stock journal and miscellaneous records.

Correspondence, legal documents, financial records for personal and business accounts, personal diaries and appointment books, and materials pertaining to the settlement of his estate.

Account ledgers, voucher registers, and other papers regarding estates, probate, and trusts established by Henry L. Day and Jerome J. Day.

Correspondence relating to the Hercules Mining Company and personal correspondence, records relating to Day's activities with the State Bank of Commerce, 1905-1936; Federal Mining and Smelting Company, 1912-1921; his proprty and investments, such as Wallac Realty Co., and other mining activities. Other papers include Day's financial records, date books, and an early ore shipment record. Also included is an 1848 W.T. Sherman letter and an 1882 autographed portrait.

Correspondence, financial records, technical reports, historical material, photographs, and other materials of the principal stockholder in Day Mines, Inc.

Personal and business correspondence, including material related to the Tamarack and Custer Mine, Idaho National Harvester Co., labor troubles, and Idaho politics. Also personal financial records including ledgers and voucher registers.

Organizational records, correspondence, financial records, ore production and shipment records, personnel and payroll records, insurance records, and tax records of silver-lead-zinc mining company headquartered in Wallace, Idaho.

Minutes of meetings, financial statements, correspondence with suppliers and stockholders, annual statements, reports to federal and state agencies, stock ledgers and journals, assessment records, lists of stockholders, financial ledgers and journals, voucher registers, ore settlement records, mill reports, and payroll and other personnel records of a silver-lead mine in the Placer Center Mining District of the Coeur d'Alene mining region in Northern Idaho.

Business records, including correspondence of manager Frank Leland.