Feasibility Study and Technical Report - Pretivm

20.1.8 WASTE MANAGEMENTMine WastesPretivm has initiated dialogue with the BC MOE and the BC MEMNG as well asEnvironment Canada at a federal level. All agencies’ have had a favourable response tothe mine waste management plans.Mine wastes, including waste rock and tailings, will be backfilled underground andsubaqueously deposited into Brucejack Lake to provide reducing conditions to preventpotential ARD development. This method was previously used to dispose of waste rock intoBrucejack Lake in 1999, following underground development completed by Newhawk GoldMines.Brucejack Lake is approximately 85 m deep; tailings and waste rock will be stored within thebottom 45 m of the lake. When not being directed as paste backfill to the underground,tailings will be delivered to the lake via a pipeline from the process plant. Lake and waterquality modeling studies are ongoing. Mitigation measures may be required to ensurecompliance with discharge and receiving environment water quality criteria. Mitigationmeasures currently being considered to address potential elevated levels of TSS includeinstallation of a water control structure, turbidity curtains, and washing of waste rock offines before being placed in the lake.Backfilling of tailings and waste rock will reduce the amount of waste materials placed inthe lake and avoidance of sub-aerial deposition of PAG waste rock material will minimizethe potential to generate ARD. This will also reduce the visual signs of the mine followingclosure, and eliminate the need for long-term waste rock stability monitoring. Long-termwater quality monitoring is anticipated. These disposal methods are described in moredetail in Section 18.0.Non-hazardous WasteWaste management will also involve the segregation of industrial and domestic wasteinto appropriate management streams. Project waste collection and disposal facilitieswill include one or more incinerators, a permitted landfill, waste collection areas forrecyclable and hazardous waste, and sewage effluent and sludge disposal. Wastecollection areas will have provisions to segregate waste according to disposal methodsand facilities to address spills, fire, and wildlife attraction.Hazardous WasteHazardous waste materials, such as spoiled reagents and used batteries, will begenerated throughout the life of the Project, from construction to decommissioning.These materials will be anticipated in advance; they will be segregated, inventoried, andtracked in accordance with federal and provincial legislation and regulations, such as thefederal Transportation of Dangerous Goods Act (1992). A separate secure storage areawill be established with appropriate controls to manage spillage. Hazardous waste will belabelled and stored in appropriate containers for shipment to approved off-site disposalfacilities.Pretium Resources Inc. 20-20 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC