1964 and before, dimes were made out of 90 percent silver.
The same went for quarters and half dollars.
And then the us mint made half dollars from 1965-1969 40 percent silver.
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US dimes were 90% silver through 1964. In 1965, the US shifted to clad coinage (75% copper, 25% nickel) for circulating coinage.
There is no silver in currently minted US dimes. Silver was replaced by copper-nickel starting with the 1965-dated coins.Special "Prestige" proof sets containing silver dimes, quarters, and halves have been made for collectors since 1992 but these coins aren't intended for circulation.
Current Canadian dimes are made of steel. Before that they were made of nickel, and up till 1967/68 they were made of various alloys of silver and copper. Current US dimes are made of a metal "sandwich" consisting of outer layers of 75% nickel and 25% copper bonded to a core of pure copper. Up till 1964 US dimes were made of 90% silver and 10% copper.
The US never made 40%-silver dimes. All dimes up till 1964 were 90% silver. All circulating dimes 1965 and later are copper-nickel. Please post a new question with the coin's date and mint mark.
U.S. dimes, quarters, and half dollars were made of 90% silver up till 1964. Today those denominations are made of copper-nickel, and dollar coins are made of manganese brass. Note that nickels are also made of copper-nickel. The only nickels that ever had any silver in them were minted from 1942 to 1945.