Feasibility Study and Technical Report - Pretivm

14.8.3 HIGH-GRADE DOMAINS - PROBABILITYIn order to estimate the proportion of the high-grade population within each block, anindicator variogram was calculated and modelled for the mineralized domains at thepopulation threshold (5 g/t Au and 50 g/t Ag for VOK, 5 g/t Au and 300 g/t Ag for WestZone).A lower cut-off was used for the West Zone to remove the background "waste" andimprove the quality of the indicator variograms. The lower cut applied was 1 g/t Au and30 g/t Ag.As with the low-grade and high-grade populations, the orientations of the variogrammodels were locally adjusted to reflect the interpretation due to the locally changingorientations in the VOK area. Table 14.6 summarizes the variogram models used for theprobability estimate.Table 14.6Parameters to Describe Gold Grade Continuity at the Low-grade/High-gradePopulation ThresholdAreaCut-offThreshold Orientation NuggetStructure 1 Structure 2Sill Range Sill RangeVOK Gold 5 g/t 00090 - - 3 - 20-90000 0.50 0.28 3 0.22 2000000 - - 3 - 15Silver 50 g/t 00090 - - 15 - 40-90000 0.44 0.35 8 0.21 4000000 - - 3 - 15West Gold 5 g/t -90000 - - 4 - 10Zone00240 0.37 0.45 4 0.18 1000330 - - 2 - 4Silver 300 g/t -90000 - - 5 - 900240 0.41 0.21 2.5 0.38 400330 - - 2 - 314.8.4 LOW-GRADE DOMAINSThe low-grade domains were estimated using the variograms defined for the low-gradepopulations within the high-grade domains.14.8.5 DENSITYGiven the amount of density data, a single omni-directional variogram was calculated andmodelled for the total Brucejack deposit. Table 14.7summarizes the variogram model.Pretium Resources Inc. 14-12 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC