Feasibility Study and Technical Report - Pretivm

For VOK and West Zone the interpolation was controlled by:• Minimum/maximum numbers of composites: West Zone: 5/50 per block VOK: 5/20 per block (5/50 for pass 2)• discretisation: 1 by 1 by 1 into small scale discretized blocks• maximum number of composites per hole: 10 (West Zone), 6 (VOK)• Search ellipse: West Zone: 75 m by 75 m by 30 m VOK: 35 m by 35 m by 10 m (70 m by 70 m by 20 m for pass 2).For VOK, approximately 3% of the data is above 5 g/t Au and the average proportion ofhigh-grades within the blocks was estimated at 3% within the Indicated portions of theestimate. For West Zone, around 5% of the data is above 5 g/t Au and the averageproportion of high-grades within the blocks was estimated at 5% within the Measuredand Indicated portions of the estimate.14.10.4 LOW-GRADE DOMAINSThe background low-grade domain for VOK was estimated with ordinary kriging usingdynamic anisotropies to locally adjust the search and variogram orientations to reflectthe main trends of the folding in this area. The search and variogram parameters usedwere the same as for the low-grade population within the high-grade domains.The background low-grade domain for West Zone was estimated with ordinary kriging intoa domain using the same search and variogram parameters as for the low-gradepopulation within the high-grade domains.The background low-grade domains were estimated using 1.5 m top cut composites withsoft boundaries between the low-grade and high-grade domains, but excluding the highgradepopulation from within the high-grade domains.14.11 DENSITY ESTIMATION AND ASSIGNMENTDensity was estimated using simple kriging, with a global mean of 2.54 t/m 3 , into 10 mEby 10 mN by 10 mRL parent blocks. Density values were interpolated using 1.5 mcomposites with parameters established from the variography analysis.The interpolation was controlled by:• minimum/maximum numbers of composites: 8/30 per block(2/8 for pass 2)• discretisation: 4 by 4 by 4• maximum number of composites per hole: 9Pretium Resources Inc. 14-16 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC