For example, the Silver Eagle $1 coin, which is still being minted today, is composed of 1 troy ounce of .999 fine silver. This means that the coin contains 99.9% pure silver.
Other US commemorative dollars may be made of a different silver composition. For example, the Peace Silver Dollar, which was minted from 1921 to 1935, is composed of .900 fine silver, meaning it contains 90% pure silver.
To determine the silver content of a specific US commemorative dollar, it is important to consult the coin's specifications, which can usually be found on the coin's packaging or online.