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Filo released a Pre-feasibilty study in February 2019 which focused on the upper oxide part of the deposit. This report declared a probable oxide reserve of 259 Mt with recovery via heap leach (less capital intensity vs. a sulphide project)
The PFS suggested a project with robust economics ( after tax IRR of 23%/NPV8 of 1.3B at 3.00 USD/lb Cu and 1,300 USD/toz Au); at spot metal prices the IRR is 30%+ and NPV8 is 2B+ 
