I went to the Amended Technical Report 2010 and used these same numbers (pp. 32-33)

Cash Operating Costs are estimated at US$12.49 per tonne of ore for the life of the mine. Average costs are US$4.14/t for mining, US$3.94/t for milling, US$0.93/t for general and administration, and US$3.49/t concentrate handling and treatment.

http://www.copperfoxmetals.com/i/pdf/Updated_Amended_Technical_Report_5.20.10.pdf

Instead of revenue/t - opex costs/t, I went by revenue/year for moly, gold, silver - opex/year. Came out to US$0.38/lb extra to add to the copper $/lb, so something was a little off in my calculations.

Thanks Chappy, now I can't rest until I recalculate the numbers, and get them to match up :) This is a good question and math problem although there are other more leisurely things to do this afternoon - I didn't realize how big moly figured into the calculations. Good thing gold/silver prices pretty much balance the moly price decline.