Records predominantly span 1912-1931, though compensation records continue through 1970. It appears that Quincy Mining Company followed a generally consistent pattern in documenting injuries to workers during this period. A Foreman's Report of Accident was issued by the worker's supervisor at the site of the accident. The injured party would then see the company doctor/surgeon where a Surgeon's First Report was issued (ongoing treatment would be accompanied by a Surgeon's Second Report, etc.). Based upon the medical examination, the doctor would classify the accident into one of four categories: No Loss of Time injuries, Don't Report injuries, Non-Compensable injuries, and Compensable injuries. Each injury accident was recorded through a numbered file, though not all files have survived in this collection. The files contain a wide variety of information, including Foreman's Reports, Surgeon's Reports, hospital records, compensation claims and payment records, as well as other medical information about the employee and his family. An Accident Record served as a chronological register of the different types of accident files, with a single listing for both compensable and non-compensable injuries. The Accident Claims Index volumes (item 021) only index the compensable and non-compensable injury files, while the Injury Compensation Payroll Summary lists all compensation claim recipients (and payment amounts) chronologically.

There is a smaller set of records describing accidents and workmen?s compensation issues, dating 1926-1970, listed at at the end of this record series.