Feasibility Study and Technical Report - Pretivm

The results of the comparison indicated that the core density was on average 6% lowerthan the pulp specific gravity within the siliceous zone and 9% lower on average in allother rock types. As a result the pulp specific gravity measurements−which were used toestimate density in the model−were factored by 6% (siliceous zone) or 9% (other rocktypes) prior to statistical analysis and estimation.11.3 QUALITY ASSURANCE AND QUALITY CONTROL11.3.1 DATA – 2011During 2011, data were entered into a data capture tool suited for import to a database.Data were then sent digitally to Caroline Vallat at GeoSpark Consulting Inc. (GeoSpark).Updated sampling data were provided regularly, including down hole primary sampledetails, as well as reference to duplicate samples, and standards and blanks insertedthroughout the sampling. The drillhole header, survey, and down hole attribute data werealso provided on a regular basis.To the best of GeoSpark’s knowledge, the sample data were provided in their originaldigital state, and there is no reason to suspect any data tampering.Data provided were loaded into a relational database suited for quality assurance(QA)/quality control (QC) on the analytical results reported by ALS, Vancouver. Thedatabase was reviewed regularly to ensure that the data remained functional for use.This included, for example, eliminating down hole interval overlaps and records beyondend of hole depths, as well as addressing any data entry issues related to the down holeattribute codes. Updates were also made to the sampling table wherever QA/QCmeasures revealed data entry issues related to the sample identities or details. Forexample, there were some issues where the wrong standard identity was entered and theanalytical results returned clearly revealed the correct standard identity. All updates tosample identities were tracked within the database.All analytical results were entered directly from ALS and SGS Canada assay certificates toa database managed by GeoSpark. The analytical results were then provided to Pretivmpersonnel for internal use.Ongoing review of the analytical results took place in order to remedy any suspectanalytical results. Re-analyses were requested from the laboratory whenever there was aquestion of the accuracy of results reported. In addition, internal laboratory repeat andfield duplicates were reviewed in order to monitor the repeatability or precision of resultsreported.Any re-analyses were further reviewed and the results were assigned to the primarysamples, which were denoted with a suffix of “R” meaning re-run.Duplicates, standards, and blanks were inserted approximately every twentieth sampleand amount to 5.86%, 5.76%, and 5.98% relative to the total number of primary samplesPretium Resources Inc. 11-3 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC