Feasibility Study and Technical Report - Pretivm

primary function of these units is to power critical loads underground and in themill, select critical loads throughout the site can be powered as well.• One of the 500 kW, 600 V diesel generators purchased for constructionactivities will be re-deployed as a dedicated back-up power supply for thepermanent camp.A dedicated power system PLC will be included in the e-house. This PLC will connect to4.16 kV and 600 V switchgear as well as mine heating systems using fiber opticcommunication. An UPS will back up the PLC and communications to ensure reliableoperations under all circumstances.The power system PLC will perform two important functions:• load optimization/load shedding to ensure line limits are not exceeded, whilemaximizing electricity use for mine heating• power control during emergency power operations to ensure correct sequencingand operations of critical loads.Although soil resistivity tests have not been performed, soil resistivity is expected to bevery poor because of bedrock and mine waste. As a result, remote ground(s) will beconstructed in addition to substation yard grounding.18.16 FUEL SUPPLY AND DISTRIBUTIONDIESELDiesel fuel primarily for mobile equipment will be stored in four 50,000 L double-walledtanks located at the laydown area. The storage is estimated for a 10-day capacity,including allowance for auxiliary equipment. The fueling station will include a receivingpump, a strainer and delivery pumps, and filters.One 5,000 L double-walled diesel fuel batch tank will be located on the surface abovethe vicinity of the underground fuel storage, and will serve to fill the 20,000 Lunderground mine tank by gravity.AVIATION FUELAviation fuel for helicopters will be stored in one 5,000 L double-walled fuel tank locatedadjacent to the helicopter landing pad.GASOLINEGasoline for mobile equipment will be stored in one 5,000 L double-walled fuel tanklocated adjacent to the diesel fuel tanks.PROPANEThree 5,000 gal propane tanks will be located adjacent to the permanent camp facilities.Pretium Resources Inc. 18-42 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC