The records of the Ray-Jefferson Mining Company span the years 1909 to 1951, with the bulk of the material covering the years 1916 to 1940. Included are minutes of meetings, financial statements, correspondence with suppliers and stockholders, stock ledgers and journals, assessment records, lists of stockholders, financial ledgers, voucher and check registers, tax returns, and time books and payroll records.

Related materials can be found in the records of the Monitor Mining Company and among the papers of John H. Wourms.