Are all US coins legal tender? Yes
In 1965 the Coinage Act was passed and defined the United States legal tender as U.S. coins and currency.
SEC. 102. All coins and currencies of the United States (including Federal Reserve notes and circulating notes of Federal Reserve banks and national banking associations), regardless of when coined or issued, shall be legal tender for all debts, public and private, public charges, taxes, duties, and dues.
The American Gold Eagle is an official gold bullion coin of the United States. Authorized under the Gold Bullion Coin Act of 1985, it was first released by the United States Mint in 1986.
SECTION 1. This Act may be cited as the “Gold Bullion Coin Act of 1985”.
MINTING GOLD BULION COINS :
SEC. 2. (a) Section 5112(a) of title 31, United States Code, is amended by adding at the end thereof the following new paragraphs:
“(7) A fifty dollar gold coin that is 32.7 millimeters in diame- ter, weighs 33.931 grams, and contains one troy ounce of fine gold.
§5112. Denominations, specifications, and design of coins
(a) The Secretary of the Treasury may mint and issue only the following coins:
(1) a dollar coin that is 1.043 inches in diameter.
(11) A $50 gold coin that is of an appropriate size and thickness, as determined by the Secretary, weighs 1 ounce, and contains 99.99 per- cent pure gold.