Hello, I'm an expert in numismatics, which is the study or collection of currency, including coins. When it comes to the composition of dollar coins, there are a few different types that have been minted in the United States.

The standard Sacagawea dollar coins and the Presidential dollars that followed are not made of gold. They are composed of a Manganese-bronzed alloy, which is a combination of manganese, copper, zinc, and nickel. This gives them a golden color, but they are not gold.

However, there is a type of dollar coin that contains gold. The American Gold Eagle is a bullion coin whose one-ounce version contains pure gold. It's important to note that the American Gold Eagle is not a circulating coin meant for general transactions but rather a collectible or investment piece.

To summarize, while most dollar coins in circulation are not gold, there are gold coins produced by the United States Mint that are denominated in dollars.

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Dollar coins have been minted in the United States in gold, silver, and base metal versions. Dollar coins were first minted in the United States in 1794. ... While true gold dollars are no longer minted, the Sacagawea and Presidential dollars are sometimes referred to as golden dollars due to their color.read more >>