Pleas post new question with a denomination
If the coin is a modern gold bullion coin it is 1/4oz of pure gold. If it's a pre-1933 coin it has .48375oz of pure gold in it.
It's not a US coin. The Mint has never made a $100.00 gold coin.
The US quarter eagle has .12094oz of pure gold
The US has never made a gold half dollar.
0.48375 troy ounces (in a real gold dollar from the 1850s)
The first US $10 gold coin was made in 1795 so look at the coin again and post new question.
It is 91.67% (0.1 ounces) gold, 3% silver, and 5.33% copper.
It's not gold, it's brass and is just a dollar. The US has not issued a gold one dollar coin since 1889.
I hope you know the coin is not gold, just gold colored. Unless it's a proof coin it's only worth a dollar.
The coin is made of 90% gold and 10% copper with an Actual Gold Weight of .96750oz of pure gold. All U.S. $20 gold coins have the same composition.
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In 1995 the mint issued a $5 gold coin which now has a value of about $150 and a $10 gold coin which is now valued at about $450.