Feasibility Study and Technical Report - Pretivm

The results from these variability tests indicated:• There was no significant variation in metallurgical performance between theWest Zone and Galena Hill Zone mineralization.• In general, the samples tested were amenable to the combined procedureconsisting of gravity separation, flotation, and cyanide leaching. The overallaverage gold recovery was 94.5%, which was approximately 19% higher than theaverage silver recovery.• The overall gold recovery increased, with an increase in gold head grade. Itappears that the overall silver recovery variation with head grade was lesssignificant, although silver head grade ranged widely from 10 to 205 g/t.• The regrind size was finer than 80% passing 10 µm.The results from the samples tested using Flowsheet B and Flowsheet C are plotted inFigure 13.27 for gold and Figure 13.28 for silver.Figure 13.27 Variability Test Results – Gold Metallurgical Performance (2010-2011)Pretium Resources Inc. 13-46 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC