Precious-metal prices change every day so any answer posted here would be out of date almost immediately.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.
Assuming your item weighs one ounce, you can check a site such as www.kitco.com (see below), CNNMoney, etc. for the latest spot prices.
How much is a .999 fine silver coin worth Ten dollar redeemable cash value .999 fine silver limited edition collector's series ...
One ounce of .999 silver was worth approximately $21.00 in July 2014. The price of silver and all precious metals fluctuates with supply and demand and the stock market.
The fact it has a stagecoach on it adds nothing to the value, it's likely just a one ounce "Silver Art Bar" that is .999 pure silver and worth about $28.00
The value is just for the silver, about $30.00.
The value depends on the weight of the coin. As of 26 November 2013, silver is worth $19.85 per troy ounce.
$42.00
The U.S. Mint did not issue any .999 silver Kennedy coins in 1964.
A little over $16 each.
It depends on the weight of your .999 pure silver coin. Currenrtly silver is $24.13 per ounce.
8USD 87cents as of 3/23/13
About $2.
The value is just for the silver, about $28.00