Whoopsies - with regards to the statement in my last post
"Copper is actually not that rare. I think the earth has got something like 5000 or 10000 years worth of copper left in the ground, based on current annual usage. "
Just double checked and re-read the report where that came from, at
http://minerals.usgs.gov/minerals/pubs/commodity/copper/mcs-2013-coppe.pdf
And they estimate land based global resources at 3 billion tonnes so at 17 million tonnes a year that's around 175 years of copper left.
Argh, that'll teach me to keep writing from memory. Apologies to all.
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