How is Copper Produced? 
http://expectingtheunexpected.com/member.php?action=profile&amp;uid=1891 
 
Copper production - Country rankings 
http://adaptation-sterea.envirometrics.gr/index.php?topic=73714.0 
 
 
The Copper Smelting Process 
http://nasza-furia.phorum.pl/viewtopic.php?f=282&amp;t=6337 
 
Is Copper a Good Electrical Conductor? 
http://jn.51huli.net/forum.php?mod=viewthread&amp;tid=28807&amp;page=1&amp;authorid=38407 
 
Will There Be Enough Copper for The Future? 
http://yabsyon.com/viewthread.php?tid=117914&amp;extra= 
 
Copper provides strength and ductility 
http://forum.wudang-kungfu.com/showthread.php?tid=318