The fonds consists of medical claim files collected between 1939 and 1974 for Consolidated Mining and Smelting Company of Canada (CM&S, later known as Cominco) workers in Trail, B.C. Files include claim forms with doctors’ certificates, checks to sick accounts, correspondence between the Society and worker and/or worker’s doctor, medical examination sheets, and other material produced by workers’ participation in the claim process.

Claim forms were submitted by workers every fourteen days during a given benefit period to obtain claim payment. These forms generally record dates from which the employee was absent and was expected to return to work, a doctor’s diagnosis and certification of the worker’s claim, and, if relevant, details of the sickness or accident inciting medical attention. Some files include a full medical examination sheet, which was required for a worker’s acceptance as a Society member. Although not included in every file, correspondence was produced when the Society assessed the validity of a claim and/or extended benefits, doctors attested to an employee’s fitness (or lack of) to return to work, and workers checked on the progress of their claims.