U.S. National Archives (Record Group 104, Entry 272, Daily Production by Mint 1880-1889) Öffentlichkeit Deposited
Reports concerning bars manufactured and coinage executed, 7/1880-6/1889.
See also the coinage figures in entry 271 (https://nnp.wustl.edu/library/archivedetail/524535).
The National Archives catalog record is https://catalog.archives.gov/id/7065574. See also the National Archives & Records Administration numismatic finding aids at https://nnp.wustl.edu/library/archivedetail/538870.