Feasibility Study and Technical Report - Pretivm

• This estimate does not contain permitting costs or other development costs.Additionally, costs for management and engineering are based on an engineerprocure-contract(EPC) delivery model.• The clearing estimate is based on the following parameters: a 30 m wide right-of-way and average clearing width, with tree sizes andstand density as observed during aerial reconnaissance of the proposedroute very limited new and upgraded road, as almost all of the towers will beplaced with helicopters clearing along forested portions of the route, to be confirmed by forestengineering as part of detailed cost estimate; this estimate also assumesthat the felled trees will be left in place with some bucking and limbing, asthey are small and likely not merchantable. these costs also assume that Pretivm will provide access (or permits foraccess) along the road to the Granduc Mine and the use of the tide stagingarea prior to line construction mobilization.• Foundation conditions were estimated based on 30% soil, and 70% rock. Thefoundation estimates also include four specialized foundations for the longerspans across the snowfields south of the Knipple Glacier.• Transmission structure assumptions include the assumption that single steelpoles will be placed on suitable bedrock foundations for virtually the entiretransmission line route.• Helicopter stringing support will be along the entire route.• Note that this estimate assumes construction over two field seasons, as per theproposed construction schedule. In the event the Project schedule stretchesover a longer period of time, or compressing of the schedule is necessary due todelayed construction start, increased costs are likely compared to the costs inthe estimate.For the operation and maintenance costs, Valard estimated the annual costs for activitiescommonly included as part of transmission line operations and maintenance for linescomparable to the Brucejack Transmission Line. These include aerial inspections on anannual basis (including thermal imaging every second year), detailed ground inspectionsevery four years, and some vegetation management. The operation and maintenancecosts will also need to include an active snow avalanche control program for the slopesabove the transmission line.18.8 ANCILLARY SURFACE FACILITIES18.8.1 ARCHITECTURAL DESIGN BASISThe architectural design criteria outlines the cost estimation parameters of structuresand facilities for the Project. The ancillary facilities design used pre-engineered andPretium Resources Inc. 18-28 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC