No country currently mints silver coins for circulation. The price of silver is determined by the free market and changes daily. It would be impossible to put a denomination on a circulating silver coin because its value in silver could exceed its face value*.
However many, many countries mint special bullion coins that contain silver. These coins are sold to collectors and investors at prices that depend on the current price of silver metal. A lot of them are marked with artificial denominations to meet legal requirements but their metal value is very different. For example, a US "silver eagle" coin carries a $1 denomination but contains 1 oz. of silver metal which at various times has gone for anywhere from $12 to nearly $40.
(*) That's exactly what happened in the 1960s when silver prices were deregulated. Silver-based coins suddenly became worth more than their denominations ("face values"). In the US and Canada people could go to a bank, get a roll of 40 silver quarters for $10 and then sell them to a metal dealer for 10 or 15 times that amount. The governments were effectively paying people to melt coins! In the US so many dimes, quarters, and halves disappeared into melting pots that it was common to receive change only in nickels and pennies.
The U.S. Mint did not issue a 1979 Silver Proof set. None of the coins contain any silver.
No current circulating US coins contain any silver at all. For information about older coins, please see the Related Question.
The only US coins made for general circulation after 1964 to have silver are the Kennedy half dollars dated 1965 to 1969, but they only contain 40% silver not 90%
Nickel coins do not contain any silver. Nickel is actually a separate metal, and it is commonly used in coinage due to its resistance to corrosion. Silver coins, on the other hand, are made primarily from silver.
No country produces general circulation coins containing silver or any other precious metal. No country could afford to. South Korean coins are mostly made from bronze, which contains a very high percentage of copper or, a copper/nickel alloy which also has a high percentage of copper.
None of the Bicentennial coins regardless of denomination or mintmark struck for general circulation contain any silver. Only special collectors coins sold from the Mint had any silver, and that is only 40% not 90%.
The series of Eisenhower dollars is a little confusing. Special 40% silver collectors coins were produced from 1971 to 1976. No 1977 or 1978 coins were struck in silver. None of the coins made for and released into circulation contain any silver.
None that are made for circulation contain any silver. However, some special proof coins made for collectors DO contain silver. The same goes for dimes and half dollars as well.
None of the coins released for circulation have any silver. People call them silver dollars just because of the size of the coins. Only special collectors coins sold from the Mint had any silver.
The ONLY 1971 Eisenhower dollar to have any silver (just 40%) is the "S" mint-marked Proof or Uncirculated coins that were sold from the US Mint. No other 1971 dated coins contain any silver.
Eisenhower was on the last silver dollar. The US mint is now producing a series of dollar coins that will eventually picture every non-living ex-president. None of the coins contain any silver.
The only coins issued for circulation after 1964 to contain any silver were kennedy half dollars (1965-1970). They are 40% silver not 90% with an Actual Silver Weght (ASW) of .1479oz of pure silver. No other U.S. coins made for general circulation from 1965 to date have any silver in them.