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Re: Toxic Avenger post# 67150

Thursday, 11/20/2014 8:08:05 PM

Thursday, November 20, 2014 8:08:05 PM

Post# of 80983
Maybe you'll find this table and graph provided in the "Porphyry Copper Deposits of the World: Database And Grade and Tonnage Models" provided by the USGS (United States Geological Survey) to be helpful in your understanding of the average grades contained in the world's porphyry deposits: