Feasibility Study and Technical Report - Pretivm

for which an age of c.110 Ma has been reported in the literature (e.g. Kirkham andMargolis 1995).The host rock and mineralization ages from the Property overlap with dates determinedfor known alkaline porphyry copper-gold deposits in the Intermontane Belt (Figure 7.16 ),particularly those of the nearby KSM deposits. The spatial, stratigraphic, andgeochronological association between the Brucejack deposits and the KSM porphyryintrusive rocks suggest a genetic link between the high-grade gold mineralization atBrucejack and the KSM deposits. However, the age constraints on the Brucejackhydrothermal system indicate it may have been driven, in part, by a somewhat youngerand relatively long-lived porphyritic stock, or a series of successive porphyritic stocks,emanating from the same deep-seated arc-related magmatism that led to the formationof the slightly older KSM deposits.Figure 7.16Brucejack Property GeochronologyPretium Resources Inc. 7-37 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC