http://en.wikipedia.org/wiki/Nickel_(United_States_coin)
Metal value
As of December 14, 2006, the value of the metal in a United States nickel coin reached $0.055759, an 11.5% premium over its face value.[6] This was due to the rising price of copper and nickel and the decline in value of the United States dollar.[7] In an attempt to avoid losing large quantities of circulating nickels to melting, the United States Mint introduced new interim rules on December 14, 2006 criminalizing the melting and export of cents and nickels. Violators of these rules can be punished with a fine of up to $10,000, five years imprisonment, or both.[8]
Both the US pre-1982 cents and all US nickels have a metal content at market worth more than face value of the coins. As of June 13, 2008, the US nickel has $0.06013 in metal content; all circulating US nickels carry a 20.3% premium over face value in metal content metal at market prices. The intrinsic value of pre-1982 US cents, weighing 3.11 grams, are worth $0.02414, 141.4% above face value in metal content at market prices. However, post-1982 US cents, which weigh 2.5 grams, are 97.5% zinc and 2.5% copper (coated over the zinc) by weight. These have an intrinsic value of $0.00508 as of June 13, 2008, or 49.2% less than face value.
Costs of producing and shipping one-cent (penny) and 5-cent (nickel) coins during fiscal year 2007 were $0.0167 per cent and $0.0953 per nickel. Canada switched to making plated steel coins in the year 2000, where the face value of some older coins is below the metal content of those coins. In a similar move on February 8, 2008, a bill was introduced in the U.S. House of Representatives that would allow for changing the metal components in U.S. coins due to the rising cost of commodities and the declining U.S. Dollar.[9] No such bill has yet been signed into law.
The silver content of nickels minted during World War II from 1942 to 1945 is 1.75 g (0.062 oz), and is valued at $0.83 based on the closing price of silver on March 25, 2009.