Denver Mint records scanned at the National Archives (NARA) in Denver - covering the period 1909 - 1976. Record group 104. Sweeps Assay Bullion Books, 1944-1976. Rules and Tables for computing Values, 1909.  Courtesy of John Graffeo.  

NARA description (Sweeps): This series consists of books that contain forms which report assays of sweeps of precious metals. Information in the reports includes date of assay, weights, and a breakdown of the content of the various metals.

NARA description (Rules and Tables): This series consists of rules and tables for computing bullion value. The records indicate the fineness of the gold, its weight and size, along with any distinguishing features.

NARA catalog entries (Sweeps): https://catalog.archives.gov/id/2790547.

NARA catalog entries (Rules and Tables): https://catalog.archives.gov/id/2675018.

Denver Mint records scanned at the National Archives (NARA) in Denver - covering the period 1909 - 1934. Record group 104.  Information resource name and date range: “Record of Deposit Received by Mail Express, Oct. 5 1909 - Apr. 24 1914.”  Courtesy of John Graffeo. 

NARA description: This series consists of records of deposits received by express mail. The records include the dates the mail was received, the amount of the deposit, and a brief description of the transaction.

The NARA catalog entry is https://catalog.archives.gov/id/2674936.