When did the US Mint stop making pure silver coins?

Answer

1964 was the last date of silver coins. There are a couple of trifles here. First, quarters were never untainted silver. The silver was always alloyed with about 10% copper. Second, during the changeover to cupronickel clad coinage, silver quarters were struck during calendar 1965 but they still had the date 1964, so there's no way to tell what year a '1964' quarter was actually minted.
Q&A Related to "When did the US Mint stop making pure silver..."
The last year for solid silver dollars was 1935. The year 1964 was the last year for solid half dollars, quarters and dimes, although half dollars were partially silver until 1970.
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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
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Silver was no longer used in the minting of dimes and quarters beginning in 1965. Half dollars contained 40% silver from 1965 through 1970. Beginning in 1971 there was no silver used
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1964 was the date on the last 90% silver coins. The 1964 date was
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