A copper pendant found in what is now Iraq dates back to 8700B.C.. It was the only metal known to man for the next 5000 years. They used native copper (as it was found) in all metal applications. Copper began being alloyed with tin and lead and the Bronze age was born. The Bronze Age lasted many centuries and ended about 1200 B.C. when tin supplies dwindled. The Iron Age was born simply because iron was more readily available. Copper has been a reused metal for thousands of years and is currently a highly recycled metal. There is no doubt that it will continue to be recycled. Arizona is the largest source of copper in the United States. In 1982 the copper penny's base material was changed from 95% Copper to 97.5% Zinc. In 1982 both Copper & Zinc pennies were minted. Here is how you can tell the difference. Copper pennies weigh 3.11 Grams a Zinc penny weighs 2.5 Grams. If you don't have a Gram scale you can tell by the ring test. Drop a copper penny an it rings a zinc penny sounds flat.
Copper Bull Early Dynastic III circa 2500BC Tell al-'Ubaid Asia Minor British Museum Bloomsbury London