The Mike Ivers Park City mining collection (1885-1923) focuses on mining and labor in Park City, Utah, during a period in which unions worked to organize the mining industry. Included is a list of miners and their union affiliations. Also present are letters of recommendation with warnings of Industrial Workers of the World union membership, union circulars, a notice of Park City Citizens Alliance, documents regarding the 1919 strikes at the Silver King Consolidated Mining Company, and mining companies' payroll and daily journals. The collection also offers a time book from Ontario Mine Shaft #3 and extracts from a mine inspector's report.
The Guy R. McKay papers (1935-1954) consist an original and photocopy of a report by McKay titled The American Flag Mine. The report was intended to furnish geological and engineering data to accompany an application of the Park City Development Company for listing its stock on the Salt Lake City Stock and Mining Exchange. A photocopy of McKay's obituary is also included in the collection.