1. Pre-1965 Dimes, Quarters, and Half Dollars: Dimes, quarters, and half dollars minted before 1965 contain 90% silver and 10% copper. These coins are commonly referred to as "silver coins" or "90% silver coins."
2. Pre-1971 Half Dollars: Half dollars minted between 1965 and 1970 also contain 40% silver and 60% copper, making them "40% silver coins."
3. American Silver Eagle: The American Silver Eagle is a popular bullion coin introduced in 1986. It is considered legal tender but primarily serves as a collectible and investment vehicle. The American Silver Eagle contains 1 troy ounce of .999 fine silver.
4. Special Mint Sets: Occasionally, the US Mint releases special mint sets that include proof or uncirculated coins made from silver. These sets are sold to collectors and may have higher silver content than standard circulation coins.
It's worth noting that the vast majority of US coins in circulation today are composed of copper-plated zinc, commonly referred to as "clad coins." These coins do not contain any silver and are produced to reduce the cost of coin production and combat the increasing value of silver.