The establishment of a mint was authorized by act of April 2, 1792 (1 Stat. 246). The Bureau of the Mint was established by act of February 12, 1873 (17 Stat. 424), and recodified on September 13, 1982 (31 U. S. C. 304, 5131). The name was changed to United States Mint by Secretarial order dated January 9, 1984. The primary mission of the Mint is to produce an adequate volume of circulating coinage for the Nation to conduct its trade and commerce. The Mint also produces and sells numismatic coins, American Eagle gold and silver bullion coins, and national medals. In addition, the Fort Knox Bullion Depository is the primary storage facility for the Nation's gold bullion. The U. S. Mint maintains sales centers at the Philadelphia and Denver Mints and at Union Station in Washington, DC. Public tours are conducted, with free admission, at the Philadelphia and Denver Mints.