I found this quote interesting.

For complete disclosure of Lumina's mineral resource estimate refer to the Preliminary Economic Assessment Report on the Taca Taca Copper/Gold Molybdenum Project dated May 24, 2013, prepared by Ausenco Solutions Canada Inc. with an effective date of April 9, 2013, which is available under Lumina's profile at www.sedar.com.

(1) Copper equivalent calculated using US$2.00/lb Cu, US$800/oz Au and US$12.00/lb Mo and is not adjusted for mining and metallurgical recoveries as these remain uncertain. The formula used is as follows: CuEQ = Cu% + (Au g/t x 0.583) + (Mo% x 6).

we all know the difference now between PFS and FS.