Feasibility Study and Technical Report - Pretivm

more heavily altered than those above, being almost completely metasomatized to greensericite in places. Coupled with evidence for hydraulic and tectonic fracturing andbrecciation of the siliceous zones and previously-formed stockwork and veins, thesefeatures suggest that the siliceous zones formed in response to silica flooding of thepreferentially permeable conglomerate, and then acted as local pressure seals that wereeventually brecciated as a response to local overpressure conditions. The intenselysilicified zones generally appear to be sub-parallel to the stratigraphy.Au:Ag ratios within the VOK are typically 2:1 or higher. Variations in this ratio, whichcould be a function of thermal gradients developed at the time of mineralization, aresuggested by a visible increase in the proportion of silvery electrum (at the expense ofmore gold-coloured electrum) with a concomitant increase in the proportion of veinhostedadularia towards the eastern parts of the zone. Additional precious metal-bearingminerals found in the VOK, typically in trace quantities, include silver sulphides,acanthite, pyrargyrite and tetrahedrite, and associated base metal-bearing sulphidesinclude sphalerite and galena. Low-grade bulk tonnage mineralization, associated withdisseminated anhedral pyrite, forms a halo within the altered rocks, surrounding the highgrademineralization corridors.The VOK Deposit is currently defined over 1,200 m in east-west extent, 600 m in northsouthextent, and 650 m in depth. Drilling during the 2012 drilling program resulted inthe extension of the VOK west across the Brucejack Fault, thereby making the zone opento the west, as well as to the east and at depth.Pretium Resources Inc. 7-21 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC