Feasibility Study and Technical Report - Pretivm

underground crushing operations and crushed ore conveying operations that willtransport the crushed ore to the coarse ore surge bin. Data collected from the crushingand conveying operations will be provided to both the mill process control system and theunderground control system via a serial Ethernet gateway.The crushing control systems will control:• SAG mill feed conveyors, including the conveyors in the primary crushing facility(zero speed switches, side travel switches, emergency pull cords, and pluggedchute detection)• surge bin levels (radar level, plugged chute detection)• the primary crusher when the emergency stop is activated.Plant Control SystemTo control and monitor all mill building processes, three PC workstations will be installedin the building’s central control room.The PC workstations will control and monitor the following:• grinding conveyors (zero speed switches, side travel switches, emergency pullcords, and plugged chute detection)• SAG and ball grinding mills, including the regrinding mill (mill speed, bearingtemperatures, lubrication systems, clutches, motors, and feed rates)• particle size monitors (for grinding optimization and cyclone feed)• pump boxes, tanks, and bin levels• variable speed pumps• hydrocyclone feed density controls• thickeners (drives, slurry interface levels, underflow density, and flocculantaddition)• flotation cells (level controls, reagent addition, and airflow rates)• samplers• gravity concentrators• pressure filters and load out• reagent handling and distribution systems• tailings disposal to the paste backfill plant or tailings storage in Brucejack Lake• water storage and distribution, including tank level automatic control• air compressors• paste backfill plant (vendor control system)Pretium Resources Inc. 17-16 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC