A. Pay Rolls, 1901-1947, 3 boxes and 10 vols. Pay Rolls record employees, their jobs, and their pay and deductions for each pay period. Recapitulation sheets for each pay period summarize various parts of the company's operations and list firms and persons to whom deductions were credited, with amounts. Pay rolls for administrative personnel are included on separate pages in the regular pay roll before Apr. 1923 and from Jan. 1937-Oct. 1940; the administrative pay roll Apr. 1923-Dec. 1936 and Nov. 1940-Oct. 1947 appears in separate volumes, numbered 12 and 13 of this series. Vol. 13 contains, in addition to the administrative pay roll from Nov. 1940-Oct. 1947, administrative Compensation Records for the same years.

B. Compensation Records, 1936-1943, 4 vols. While pay rolls are arranged chronologically by pay period, compensation records are arranged alphabetically by last name of employee and give wages and deductions for each employee over the entire period of his employment. They also give such additional information as the name of whom to notify in case of accident, reasons for termination, and taxable income. These volumes include personnel of all of the Day companies. The first three cover names A-F, G-M, and N-Z, respectively; vol. 4 covers selected personnel, chiefly administrative, and is not in alphabetical order. Compensation Records for most Hercules administrative personnel after 1940 are in Pay Roll vol. 13, described above.

C. Daily Summaries, Jan. 1933-Dec. 1936, Jan. 1942-Apr. 1944, 13 folders. A record of the numbers of workers at particular maintenance tasks during a period in which the Hercules mine was shut down, including assignment at other properties owned by the Hercules.

D. Daily Mill Reports, Jan. 1933-Sept. 1935, May 1937-Dec. 1937, Jan. 1942-Dec. 1943, 10 folders. These reports record the names of workers on each mill shift; the jobs to which they were assigned; the date, mines, lot numbers, and times for ore fed and milled; number of hours of mill operation or shutdown each day.

E. Employment Cards, 1918-1927, 3 boxes. A record of biographical and personal data on each employee hired by the Hercules, including address, birthplace, marital and family status, citizenship, age, previous injuries, work experience, physical description, and languages spoken. Bundled in alphabetical order by last name of the employee; one bundle not in sequence includes cards dated into the early 1930s.