A. Miscellaneous Accident Records, 1914-1923, 1 folder. Memoranda regarding the Reynolds case, 1914; request for accident information from the State of Idaho Mining Department, 1915; Hecla Mining Co. accident reports on Frank Miklas, 1923, later reinjured at the Hercules fire.

B. Accident Reports, 1917-1923, 37 folders. These reports cover accidents numbered 3131 to 4000, which occurred from November 1917 until May 1923, when the Hercules Mining Company ceased to be self-insured. The reports include a variety of forms, such as "First Notice of Injury" or "First Notice of Death," "Hospital Admittance and Discharge Notice," "Employer's Supplemental Report," "Attending Physician's Report," correspondence with the Industrial Accident Board, receipts for compensation payments, agreements on settlement of claims, transcripts of hearings, award reports, and other documents. For some accidents, correspondence and payment receipts continue as late as 1934.

C. Accident Summaries ("Detailed Account of Each Accident"), 1918-1921, 4 folders. One-page summaries showing the status of each case active in a given year, its cause and disposition. Arrangement is by accident number.

D. Personal Injury Charts, 1918-1921, 4 folders. Summary charts listing each accident victim during the year in alphabetical order and showing disposition of the case.

E. Consolidated Accident Reports, Aug. 1927-May 1930, 2 folders. There are five types of accident reports in this series, including individual accident reports from the Sherman Lead Co., 1928-1930; individual accident reports from the Dayrock Mining Co., 1929; individual accident reports from the Humming Bird Mining Co., 1928-1929; monthly statistical reports summarizing accidents at the Hercules Mining Company, 1927-1929; and Consolidated Accident Reports providing statistical summaries of accidents at the Hercules and its subsidiaries, 1928.

F. Accident Reports, Hercules Mill, Sept. 1928-Jan. 1930, 1 folder.

G. Industrial Accident Board Correspondence and Reports, 1929-1934, 1 folder. Communications with the Idaho State Industrial Accident Board regarding compensation payments for accidents which occurred prior to 1923 while Hercules Mining Company was self-insured. The reports cover each month, May 1930-Jan. 1934, and concern payments resulting from the fatal accidents of E.M. Wright (1918) and M.E. Welsh (1922). There is also a chart of extended accident compensation payments made by the Tamarack, Dayrock, and Hercules, 1933-1936.

H. Accident Payment Record, Mar. 26, 1918 to Sept. 9, 1924, 1 vol. A register of compensation payments for injuries suffered at the Hercules, Ambergris, and Humming Bird mines; this may have been used as a preliminary record for preparing information for entry into the Accident Compensation Register described below. Arrangement is chronological by date of payment, but there is also an alphabetical distribution of victim's names.

I. Accident Compensation Register ("Compensation Voucher Register"), 1918-1935, 1 vol. The first part of this volume is a record of compensation payments to injured employees or their survivors, of the Hercules, Ambergris, and Humming Bird mines, Mar. 26, 1918 to Jan. 3, 1934. Arrangement is chronological by date of payment. There are also monthly totals of payments. The latter half of the volume is a register of compensation payments by the Hartford Accident and Indemnity Co., May 1, 1923 to Aug. 6, 1935. Arrangement is chronological by date payment received in Burke or Wallace.