The 1972 Eisenhower dollar has no silver in it and the gold plating don't do nothing for the value but it's still a dollar
Gold plating a coin does not add to the numismatic value of it. Any additional value would be seen only in the value of the added metals.
August 25, 2017. Current value $350 to $390.
August 25, 2017. $190 to $191.
August 25, 2017. $480 to $485.
As of 26 October 2017, the melt value for a Peace silver dollar is $13.13.
As of November 1, 2017 silver value is $17.07 in USD.
As of July 2017, it's worth about $1.20 for the silver.
Its worth the silver content. Right now about $25 big ones!
The U.S. did not issue any silver dollars in 1918, so that half of the question can't be answered. As for a 1922 Peace dollar, many of these were saved so they're currently worth more for their silver content than as collector's items. Regardless of mint mark, one would retail at roughly $13 or $14.
As of 6 December 2017, the price is down to $15.92 per ounce.
Silver prices vary day to day. Today 28 Dec 2017, a 1964 or earlier dime contains $1.2181 in silver. The value of the coin itself will vary greatly depending on condition, year and mint mark.
1879 U.S. Morgan silver dollars have a bullion value of about $13 today, August 25, 2017. According to PCGS (Professional Coin Grading Service) an 1879 Morgan dollar in circulated condition has a value of about $27 to $8000. In uncirculated condition it has a value ranging from $55 to $120,000. These values depend upon which mint issued it and the condition of the coin. There are also different varieties of design found on these coins which can also affect their value. If you have a Morgan dollar and wish to know its value I would suggest taking it to a coin dealer or two and get an estimate.
1964 is an extremely common date for US half dollars. As of August 2017, one is worth $6-and-change for the silver.