Dollar, Quarter, Dime and half-dollar coins from before 1965 are silver, as are nickels minted from 1942-1945 with a large mintmark over the Monticello.
Just recently with the advent of bullion coins such as the American Silver Eagle. Coins intended for circulation were never 100% silver because silver is simply too soft of a metal for coinage. They were 90% silver in American coins until 1964 for dimes, quarters and half dollars, but other than bullion coins, no coins are made of 100% silver.
The only U.S. coins currently made that are silver are American Silver Eagles and other special collectors coins sold by the U.S. Mint. These coins are NOT released for circulation.
Are silver coins made by the US Mint. Quarters, Dimes, Half dollars and dollars struck for circulation dated 1964 and prior are 90% silver. Half dollars dated 1965-1970 are 40% silver. All US coins intended for circulation dated 1971 and later are not silver. The US has and does mint silver coins intended for collectors including the American Silver Eagle, since 1992 they have made a silver proof set and there have been many silver commemorative coins minted.
The 2012 American Silver Eagles coins are one ounce of pure silver.
With those dates, the coins are Silver Eagle bullion coins that are made from one ounce of silver and value is whatever the spot price of silver is at time of sale.
For 90% silver one dollar coins they have about 24 grams of silver.
No, but there are "Walking Liberty" American Silver Eagle coins.
Yes, but none of the coins were made for general circulation. Silver Proof quarters sets and Silver Proof 10-piece sets were sold by the Mint, also the American Silver Eagle bullion coins were minted in 2006.
Try Ebay or Craigslist. Both of them are very good for selling collectibles.
Some banks do sell American Silver Eagles, but they do not hold and sell silver coins that are turned in.
The Spaniards withdrew the silver from the American mines in their colonies (like the great silver mines of Potosí in modern Bolivia) and turned it into coins in Spain proper. Then Spanish merchants sailed to China to exchange these silver coins for Chinese goods that they desired, like porcelain or silk, and this is how that American silver would end up in China.
Modern American Eagle coins have their purity displayed right on the back of each piece. It's one ounce of 999 fine silver. Don't confuse modern eagle coins with older circulating silver coins that incorporate many of the same design elements. For those you have to know what date and denomination of coin you have.