It is estimated that there is about 3.5 billions tons of undiscovered copper in the world. Copper has been rising in value for the past several years.
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Chile is the world's largest producer of copper by far.
Many experts agree that China is the country that uses copper the most. Currently China's demand for copper is higher than the supply available.
copper is too expensive and limited.
Midway through 1982, the composition of the US penny changed from 95% copper and 5% zinc to 97.5% zinc and 2.5% copper (in the form of a coating of pure copper over a core of zinc).
In mid 1982 US cents were changed from an alloy of 95% copper/5% zinc to a pure zinc core with a thin plating of copper.