Items which did not fit into established series were placed in a miscellaneous series. Types of material in this series are a record of special trips made by Bunker Hill jitneys or buses between 1938 and 1940, visitors and guest registers, plant handbooks and safety manuals, reports on non Bunker Hill mining properties and geology prepared by Oscar H. Hershey and Fred Callaway, reel to reel tape recordings and 4 15" data disks.

Other material relates to the Jackass Ski Bowl and Shoshone Recreation, Inc. - Silverhorn Ski Area. Jackass Ski Bowl, near Wardner, Idaho, was constructed in 1967 on lands leased from Bunker Hill. Operations began in 1968, but several years of poor skiing weather caused the operation to discontinue. Assets were liquidated in a foreclosure sale by the Small Business Administration in August 1973 and were purchased by Bunker Hill for $100,000. The ski facility was reorganized as Silverhorn Ski Area under the ownership of Shoshone Recreation, Inc. Included are general informational records and monthly financial statements for the years 1973-1979.