| | Ed, they were never 100%. US Standard is 90% or .900 or "900 fine." The cut-off year is 1964. 1964 and earlier were 90% silver.
(From 1965-1970, the Kennedy half dollar was "clad silver" 80/20 silver/copper outer layers over a .791/.209 copper/silver core for a net value of 40% silver by weight.)
That was since about 1873. (Before that through 1838, they were .8934. If you care, you can find the ugly details online or buy yourself a Red Book. Anyone who has an interest in old US coinage needs a Red Book. You can find a prior year used cheap.) Also, the standard is:
half dollar 12.50 grams quarter 6.25 grams dime 2.50 grams
Again, before 1873, they had lighter weights, 6.22 grams for the quarter, etc.
Also, the Silver Dollar was struck to a different weight, though, again, from 1873- 1933, they were 90% silver. A dollar weighs 26.73 grams (not 25, as you might expect). The Dollar was the Standard by Law. The other coins were adjusted to be subsidiary conveniences.
(I won't get into silver 3-cent or 20-cent pieces, though for the theorist, they do offer some interesting considerations. Note that Proof issues are often 90% silver even today. I got an "impaired proof" in change a few years ago. I won't get into Half Cents, Large Cents or 2-cents. I won't get into the Trade Dollar or the Eisenhower.)
Cents were "French Bronze" since 1864: 95% copper; 5% tin and zinc combined. (There were "steelies" in 1943; and in 1944 "brass" from bullet casings was re-used). This was until 1982.
In 1982, in the middle of the year, the present alloy, 99.2% zinc with a 0.8% copper wash, was introduced. This coin weighs 2.5 grams.
With "copper" cents - which is the common name we all understand for French bronze, just as we call them "pennies" which they are not - the break even point is $1.59/lb for copper. For silver coins, it was $1.2929/ounce of silver.
The nickel was never silver - except as a propaganda ploy in WW-2 for 1942-1945, when they were 35% silver of their 5 grams weight. A standard nickel is 75% copper, 25% nickel.
Right now the cent is worth 2.7 cents and the nickel is worth 6.3 cents. You can find the current melt value of US Coins here, at Coinflation.
It is against the law to melt nickels and cents or to export them. You can melt silver coins.
(Edited by Michael E. Marotta on 5/30, 4:46pm)
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