Feasibility Study and Technical Report - Pretivm

was conducted on the NPR values of the waste rock samples, which indicated thatapproximately 77% all of the samples analyzed are PAG material (an NPR value of lessthan two). This implies that a high percentage of waste rock material generated at themine site will likely be PAG. The flotation tailings are considered non-PAG material (anNPR value of more than two).PERCENTAGE OF PAG MATERIALS IN UNITS OF PRETIVM’S GEOLOGICAL MODELThe geological model developed by Pretivm consists of seven units. Each of these unitsis characterized by several lithologies. By comparing the location of drillholes with thecollected samples relative to the spatial extent of geological model units, the samplescollected for testing could be assigned to the different units of the geological model. Thefrequency distribution of the NPR values associated with each geological unit was testedand the results of the statistical analysis are summarized in Table 20.2.Except for the Office P1 unit, the percentage of PAG material from each unit exceeded70%. Samples representing the P2 unit were almost entirely PAG material (97%). TheOffice P1 unit had the lowest percentage of PAG material among its waste rock samples(25%) compared to all other units of the geological model.Table 20.2NPR Characterization of Geological Model Units and their Spatial ExtentUndergroundBridgeP1 Conglomerate FragmentationOfficeP1P2SilicifiedCapVolcanicSedimentaryFaciesNPR - - - - - - -Mode 0.51 0.03 0.02 1.23 0.67 0.02 0.13Median 1.07 0.64 0.37 4.56 0.82 0.34 0.67Mean 1.5 3.2 1.6 8.8 0.9 1.3 1.5Standard Deviation 1.6 15.2 7.0 14.4 0.4 4.7 3.1PAG (%) 75 72.5 82 25 97 80 78Underground WorkingCrusher - - - - - - -Volume (%) 0.12 23.75 39.01 37.12West Zone - - - - - - -Volume (%) - 17.47 35.74 10.35 7.58 0.01 28.86VOK Zone - - - - - - -Volume (%) 14.76 8.97 22.12 4.02 1.00 49.14Table 20.2 also provides rough estimates of volume percentages of the undergroundworkings (Crusher, VOK Zone, and West Zone areas) occupied by the various geologicalmodel units. The data indicate the bulk of the waste rock generated from theunderground workings will be from the Fragmental, Office P1, and Volcanic SedimentaryFacies units. Except for waste rock from the Office P1 unit, waste rock from all otherunits of the geological model can be considered PAG. Segregation of PAG and non-PAGmaterials in each unit will be very difficult because the distinction of the geological modelPretium Resources Inc. 20-10 1291990200-REP-R0012-02.1Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC