The price of silver changes every day so any answer posted here would be out of date almost immediately. While it's not normal WikiAnswers policy to say "use the internet", that's the best approach in this case. You can check a site such as www.kitco.com, CNNMoney, etc. for the latest values.
He is asking about a 1980 LIBERTY Silver Eagle. It is a bullion coin that predates (and was privately minted) the American Silver Eagle (1986). The confusion comes from the reverse having the inscription “One Silver Eagle” which many know to be synonymous with “one silver Dollar“. It is not legal tender and is worth its weight in silver and any premium you can squeeze out of a collector.
The only dollar coins issued in 1980 were made of cupro-nickel, not silver. They're only worth face value.
It's a common Susan B. Anthony dollar coin with no silver in it just spend it
The woman is Susan B. Anthony, and the coin is still worth one dollar.
It's a Silver Eagle not a Liberty coin no US coin is called a Liberty. The coin is made from one ounce of silver and the value is whatever the spot price of silver is at time of sale. The value as of 8-28-11 is $41.50.
They contain absolutely no silver, and they're worth one dollar each.
It's not silver and regardless of mintmark the value is $1. Only a proof or uncirculated coins sold from the Mint will have more than face value.
Morgan dollars were minted from 1878 to 1904 and again in 1921. Susan B. Anthony dollars were minted in 1980 and they're made of copper-nickel, not silver and have no added value if found in change.
1.00
Silver dollars do not have a hallmark. They often have mint marks, but not always. For example, a Morgan dollar with an O found on the bottom center of the side with the eagle was minted in New Orleans. Coins from the Philadelphia mint from before 1980 do not have a mint mark.
1 dollar
Not silver. All circulating half dollars struck since 1971 are made of copper-nickel and are only worth 50 cents.