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To: tyc:> who wrote (104269)1/26/2008 2:14:33 PM
From: ogi  Read Replies (3) | Respond to of 312429
 
Geological survey of Canada, and I would be surprised if they were exactly up to date, but I would also be surprised if worldwide averages in Cu porphyries have moved much. And they can't be that far out of date, note Pebble is there as well as Oyu Tolgoi and both Kemess N&S

gsc.nrcan.gc.ca

Cheers,
Ogi