RE:Valuation of a copper explorerLooks like a non-brainer looking at it with those numbers, but I guess one would also have to consider that the cost of mining (even in Peru) went up tremendously. At the moment is seems that at a price below $10.000 / ton no copper procducer isn't even feasable.
Here an interview with Friedland on this subject.
Friedland warns of copper ‘crisis’ as mine costs soar - MINING.COM At the moment it looks like as it could take a while until we see the $10,000 again, let alone anything well above.
Buffet11