Ranked: The World’s Largest Copper Producers
http://www.phonegekko.com/member.php?action=profile&uid=2673

Top Five Copper Producing Countries
http://forumsevengroup.free.fr/viewtopic.php?p=49943#49943


The History of Copper in Building and Home Decor
http://dividummies.com/viewtopic.php?f=5&t=2389

Copper, the Critical Material for Transportation Electrification
http://rpg.six168.com/viewthread.php?tid=123715&page=1&authorid=56503

Global distribution of copper minerals
http://game.776.tw/viewthread.php?tid=655508&extra=

The Importance of Copper for Modern Life
http://kbiousa.com/forum/viewtopic.php?t=26843