The 1 oz American Gold Eagle is the largest gold coin produced by the US Mint, and carries a face value in the United States of $50 USD. The coin is 22 karat gold, meaning it is composed of 91.67% gold. The remaining amount of the coin is composed of copper (5.33%) and silver (3%). Although the coin is 22 karat gold, it still contains 1 troy oz of pure gold content. This is due to the fact that the coin itself weighs 1.0909 troy ounces total, resulting in 1 troy ounce of pure gold.