The Charles S. Sprague and Benjamin Gill Papers on Nevada Mining (1904-1925) are comprised of various records from the mining companies owned and operated by businessmen Charles S. Sprague and Benjamin Gill who were active in the central Nevada boomtowns of Goldfield and Tonopah in the early twentieth century. Documents include correspondence, receipts and invoices, detailed records and copies of government legislative bills relating to the mining industry, and other business correspondence. Sprague's collection consists of his mining business correspondence dating from 1906 to 1925. Gill's papers are comprised of his business correspondence from 1916 to 1922.

Collection consists of envelopes with the Silver Centennial commemorative postage stamp (canceled) with the "Virginia City, Nevada Silver Centennial 1859-1959" die hub with postmarks of ten Nevada cities including Las Vegas. There is also a first day of issue decorative envelope.