The John Peperakis papers (1913-1990) contains correspondence, mining information, and mostly maps that are hand-drawn, originals documenting mining (coal) areas in Utah and the Rocky Mountain areas. Peperakis was a mining engineer who was manager of Sunnyside Coal Mines, Utah for Kaiser Steel Corporation.
The Utah Fuel Company records (1889-1933) consist of maps and drawings of coal mines and various projects owned and carried out by the Utah Fuel Company. The majority of the maps and drawings concentrate on Utah land holdings and projects. However, there are also some that deal with Colorado holdings of the Utah Fuel Company.