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en.wikipedia.org/wiki/Copper_mining_in_the_United_States

Copper mining in the United States has been a major industry since the rise of the northern .... Copper was first discovered in California in 1840, in Los Angeles County. The mine, at Soledad, produced a small amount of copper in 1854.

copperalliance.org/about-ica/ica-history

The Copper Alliance represents the network of regional copper centers and their members, which is led by the International Copper Association, Ltd.

www.webelements.com/copper/history.html

Copper was discovered by Known since ancient times at no data in not known. ... a given weight of the first element can be reduced to small whole numbers (the ...

www.thebalance.com/copper-history-pt-i-2340112

Mar 2, 2017 ... Copper is considered to be one of the first metals to be used by humans. ... 9,000 BC have been discovered, archaeological evidence suggests ...

www.reference.com/history/copper-first-discovered-1cad2d79c1cdb89

The earliest documented use of copper was around 9000 B.C. in the Middle East, according to ProQuest, making it one of the oldest metals known. A copper ...

www.copper.org/education/history

Copper has been an essential material to man since pre-historic times. In fact, one of the major "ages" or stages of human history is named for a copper alloy, ...

www.copper.org/education/history/us-history

Copper was first used by man over 10,000 years ago. A copper pendant discovered in what is now northern Iraq has been dated about 8700 B.C. For nearly five ...

www.copper.org/education/Kids/copperandkids_wheredoescopper.html

It usually comes from copper ore, but small amounts are occasionally found ... Ore is first mined, then put through a series of processes to refine and purify the ...

www.dartmouth.edu/~toxmetal/toxic-metals/more-metals/copper-history.html

Nov 18, 2010 ... Annealing was the first step toward true metallurgy, when people discovered that copper became more flexible and easy to work with when it ...

www.carondelet.pvt.k12.ca.us/Family/Science/Shiny/COPPER%20page.htm

It is found chiefly in the Ural Mountains of Sweden and near Lake Superior in North America. ... Copper was first used by man over 10,000 years ago. The oldest ...