http://bruno.castaing.free.fr/forum/viewtopic.php?p=23886#23886 - how much is 10 kg of copper
A Short History of Copper Mining
http://776.tw/viewthread.php?tid=655238&extra=
Geology of the Darreh-Zerreshk and Ali-Abad Porphyry Copper Deposits, Central Iran
The Benefits of Copper Wire
http://eldoradofus.free.fr/forum/viewtopic.php?pid=177641#p177641
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Copper is a recyclable material
http://socalireefer.com/forum/showthread.php?tid=667034
