Pub. L. 102-281, tit. IV, subtit. A, sec. 403
SOURCES OF BULLION.
SEC. 403. SOURCES OF BULLION. (a) Gold.—The Secretary shall obtain gold for minting coins under this subtitle pursuant to the authority of the Secretary under existing law. (b) Silver.—The Secretary shall obtain silver for minting coins under this subtitle only from stockpiles established under the Strategic and Critical Minerals Stock Piling Act (50 U.S.C. 98 et seq.).