Pub. L. 102-281, tit. V, sec. 503
SOURCES OF BULLION.
SEC. 503. SOURCES OF BULLION. (a) Gold.—The Secretary shall obtain gold for minting coins under this title pursuant to the authority of the Secretary under existing law. 106 STAT. 147 (b) Silver.—The Secretary shall obtain silver for minting coins under this title only from stockpiles established under the Strategic and Critical Materials Stock Piling Act (50 U.S.C. 98 et seq.).