Message of the President of the United States, Communicating the Report of the Director of the Mint
U.S. Mint Annual Reports (1851)
Mint Director Robert M. Patterson's report for the year 1850.
Paul Hybert summary: "A report from mint director R.M. Patterson to President Fillmore, who relayed it to Congress. The gold from California is reaching the mints in much larger quantities than in previous years."
A transcript is at: http://www.chicagocoinclub.org/lib/us/cis/31-2/s21.html.
From the Congressional serial set, 31st Congress, 1st session, Senate Executive document no. 21.