<P> The Coinage Act of 1965, Pub. L. 89--81, 79 Stat. 254, enacted July 23, 1965, eliminated silver from the circulating United States dime (ten - cent piece) and quarter dollar coins . It also reduced the silver content of the half dollar from 90 percent to 40 percent; silver in the half dollar was subsequently eliminated by a 1970 law . </P> <P> There had been coin shortages beginning in 1959, and the United States Bureau of the Mint expanded production to try to meet demand . The early 1960s was a time of increased use of silver both in the coinage and in industry, putting pressure on the price of silver, which was capped at just over $1.29 per ounce by government sales at that price . The silver in a dollar's worth of quarters would be worth more as bullion than as money if the price of the metal rose past $1.38 per ounce, and there was widespread hoarding of silver coins . Demand for the Kennedy half dollar as a collectable drove it from circulation after its debut in 1964 . The Bureau of the Mint increased production, helping reduce the coin shortages by May 1965, but government stocks of silver were being rapidly reduced, and threatened to run out by 1968 . After extensive study by the Treasury Department, President Lyndon B. Johnson in June 1965 recommended that Congress pass legislation to allow for silverless dimes and quarters, and debased silver half dollars . Although there was some opposition, mainly from legislators representing Western mining states, the bill progressed rapidly through Congress, and was enacted with Johnson's signature on July 23, 1965 . </P> <P> The new coins began to enter circulation in late 1965, and alleviated the shortages . They passed side by side with their silver counterparts for a time, but the precious metal coins were hoarded beginning in 1967 as the Treasury ended its efforts to keep silver prices low . The act also banned the production of silver dollars until at least 1970 . </P> <P> The Coinage Act of 1792 established the Mint of the United States, and made both gold and silver legal tender . This meant that anyone could present bullion at the Philadelphia Mint and receive it back, struck into coins . The 1792 act authorized six silver coins, in value from five cents to a dollar, and prescribed their weights and fineness . Making a dollar equal to given quantities of both gold and silver made the currency vulnerable to variations in the price of precious metals, and U.S. coins flowed overseas for melting until adjustments were made to their size and weight in 1834 and again with the 1853 Act, when the amount of bullion in the silver coins worth less than a dollar was reduced . The fact that the dime (ten - cent piece), quarter dollar, and other smaller silver coins contained less silver in proportion to the dollar helped keep them in circulation . </P>

When did us stop using silver in coins