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Any United States dime, quarter, half dollar or dollar that is dated 1964 or earlier is made of 90% silver. In the dime series, all coins dated 1965 or later are clad coins and contain no silver at all. The value of these coins is tied directly to the price of silver. At $20 per ounce, 90% silver coins are worth about fourteen times their face value. A dime would be worth about $1.40, a quarter about $3.50, and a half dollar, about $6.00. At the same silver price of $20, 40% silver half dollars are worth approximately $2.50 each.
Actually most modern U.S. coins are almost entirely copper. Nickels are 75% copper; dimes, quarters, and halves are 92% copper, and dollars are 88.5% copper (source: U.S â¦. Mint). The only coin that's NOT mostly copper is the penny. Starting in mid-1982 the coin's composition was changed to a core of 97.5% zinc with a plating of 2.5% copper.