Feasibility Study and Technical Report - Pretivm

un was completed representing glaciers as constant head boundaries with the boundaryset to topography (i.e. the glacier surface). This run, which represents the maximumrecharge scenario under glaciated areas, resulted in an increase in mine inflows by afactor of 1.8, with an estimated inflow averaging approximately 4,600 m 3 /d on an annualbasis.The estimates of groundwater inflow to the underground workings provided should berevisited if significant deviations from the proposed mining plans are expected. Theresults of the sensitivity runs have been provided to show the range of inflow estimatespredicted by the model. For planning purposes, the most conservative inflows areprovided by the ‘High K Mine Inflows” model run (the dark purple line, Figure 16.15) andthe base case (the dark blue line, Figure 16.15) provides the best estimate of inflowsusing the existing dataset.16.7 MOBILE EQUIPMENT REQUIREMENTS16.7.1 PRE-PRODUCTION PHASEDuring the preproduction phase, over 14,000 m of lateral development must becompleted to meet the ramp-up production schedule. Development during this periodwill peak at approximately 660 m/mo, but with the average over the pre-productiontimeframe at about 600 m/mo. A contractor will be utilized to supply manpower andexpertise to excavate the initial capital waste development program of ramps, drifts, andraises that are detailed in the pre-production development program described in Section16.4.2.To reduce risk associated with contractor supplied fleets, a portion of the pre-productionmining equipment will be supplied by Pretivm. Table 16.11 shows the breakdown ofPretivm and contractor supplied equipment for the pre-production development phase.The ancillary equipment during this period will be supplied by Pretivm.Table 16.11Contractor and Pretivm Equipment during Pre-production DevelopmentDescription Contractor Pretivm TotalTwo boom mining jumbo 1 3 4LHD, 14 t (Development) 3 2 5LHD, 14 t (Production) 0 0 0Haulage truck, 40 t 0 3 3Bolter 0 2 2Cable bolter 0 1 1Shotcrete sprayer 0 2 2ITH long hole drill 0 1 1Transmixer 0 2 2Note: ITH = in-the-holePretium Resources Inc. 16-39 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC