Feasibility Study and Technical Report - Pretivm

• the bedrock-dominated terrain along the proposed transmission route, which isfavourable for rockbolt-type foundations.It is important to note that the design constraints and construction conditions are similarto a nearby project currently being completed. This project, constructed almost entirelywith helicopters, consists of 37 towers to carry a special 300MCM conductor andoperates at 138 kV. Figure 18.8 shows a completed transmission tower for the Project.Figure 18.8Helicopter Placing Steel Transmission Structure for the LLH ProjectBased on the constraints previously noted, the following key criteria for the initial designof the Brucejack Transmission Line include:• the selection of 138 kV as the operating voltage to eliminate the need for asubstation at LLH interconnection• the use of two conductors, selected to accommodate corona effects due toelevations above 3,000 m and provide the necessary tensile strength to spanthe snowfields on the south slopes above the Knipple GlacierPretium Resources Inc. 18-26 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC