In 2000 U.S. mines turned out 1.44 million metric tons of recoverable copper valued at $2.8 billion or approximately 11 percent of world production of 13.2 million metric tons.
3%
I know copper in the US does sell by the pound at $3.00 as of today
A 1994 US cent is zinc not copper, spend it.
Except for cents and dollars, modern coins are 75% copper.
Those are 95 percent copper. A US penny weighs 3.11 grams. Of that, 2.9545 grams is copper.
Penny
Copper pennies only have an external copper gilding. The US mint went to a copper coated zinc alloy many years ago.
The Royal Mint does not produce a "quarter" coin.
solar produce us infinity engergy.
copper oxide, nitrogen and oxygen
Copper is much cheaper but still does the same job almost as well as silver.
The approx. price of copper is 7100 US $/tonne (December 2013).