There wasn't a specific date; it occurred in stages.
The last circulating 90%-silver coins were dated 1964. Dimes and quarters dated 1965 and later are made of clad cupronickel. However, during the conversion period silver dimes, quarters, and halves continued to be struck from 90% silver well into 1965 but all were dated 1964. Reportedly some 1964-dated silver dimes were struck as late as early 1966.
Half dollars are a different story. The Mint (foolishly, as it turned out) decided to continue to use silver in halves but at a reduced level, 40% instead of 90%. However by 1968 the price of silver had gone up so much that even these debased coins were worth more than face value if melted. It took 2 more years to convert the half-dollar to cupronickel. Circulation strikes were made in 1969 but only mint-set and proof-set halves were made in 1970. By the time the new clad coins came out in 1971 halves had virtually disappeared.
Since 1971, the Mint has struck additional silver coins but only for sale to collectors. These include:
The U.S. Mint never made silver certificates because the Mint only strikes coins. Paper money is made by the Bureau of Engraving and Printing. The last silver certificates were printed in the early 1960s, but all were in the 1957 series.
1867
1964 all us coins stopped being produced with silver.
The world wide increase in silver prices was the main reason.
Silver is a precious metal, and just like gold, it's going to be expensive so they stoped using it because they realized that people could melt the coins down and have a ton of money in silver.
Inflation caused the silver content of coins to be worth more than their face value so the US mint stopped making silver coins for circulation.
The U.S. Mint never made silver certificates because the Mint only strikes coins. Paper money is made by the Bureau of Engraving and Printing. The last silver certificates were printed in the early 1960s, but all were in the 1957 series.
1867
1964 all us coins stopped being produced with silver.
The world wide increase in silver prices was the main reason.
Silver is a precious metal, and just like gold, it's going to be expensive so they stoped using it because they realized that people could melt the coins down and have a ton of money in silver.
The United States stopped minting silver coins for circulation in 1964 due to the rising cost of silver. However, the U.S. Mint still produces commemorative silver coins and bullion coins for investors and collectors.
None of the Eisenhower dollars (1971-1978) that were released into circulation had any silver! Only special collectors coins sold directly from the US Mint were made from 40% silver and all of them have S mintmarks. None of the Philadelphia or Denver minted coins contain silver. The 40% silver coins were struck only from 1971 to 1976.
The last 90% silver half's made for general circulation were in 1964. 40% silver coins were issued until 1970.
1964 was the last year 90% silver coins were released for circulation. The Kennedy Half Dollar was struck in 40% silver from 1965-1969 and 1970 but the 1970 coin was not released for circulation. In 1975 & 1976 special bicentennial 40% silver collectors coins were struck and sold from the US Mint. 1982 saw a 90% silver commemorative half dollar and from 1992 to date Silver Proof sets that have 90% silver halves, quarters and dimes also have been sold from the Mint. NOTE: From 1986 to date the US has produced "American Silver Eagle" bullion coins that are 1 ounce of pure silver.
The last year for silver silver dollars was 1935. There were no dollar coins minted again until 1971, by which time silver coinage had been replaced with copper and nickel.
The last year for silver dimes and quarters, as well as 90% half dollars was 1964. Halves 1965-70 were then 40% silver. All dimes and quarters 1965-present and half dollars 1971-present are copper and nickel.