The fonds consists of records from the International Office (Denver), national office (Toronto), B.C. District Union files, Western District Union Files, and records of Canadian locals, the Western Federation of Miners, District No. 6 and its locals, the Sandon Miners Union, and the Metal Miners Union of the One Big Union (1920-1933). Records of individual locals vary from minute books and financial records, reports, and correspondence to extensive subject files and financial reports for larger locals. The fonds also includes a substantial photograph collection documenting union activities (1944 to 1962), tape recordings, films, charters, badges, official seals and recordings of Paul Robeson Peace Arch concerts (1950s).