Contents of U.S. Gold Coins. Total, Total, Gold. Weight, Weight, Weight. Coin, Fineness, Grams, Ounces, Ounces. Dollar, all types, 1849 to 1889, 0.9000 U.S. Silver Coins. 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. Silver Quarter Years. 1964 was the last year for silver quarters. A coin's numismatic or collector value may be higher than its melt value. For values of specific dates and grades for NGC-certified United States silver coins, visit the NGC US Coin Price Guide. Stay on top of the rare coin market with the NGC Weekly Market Report free e-newsletter.