Feasibility Study and Technical Report - Pretivm

Operations CampSize 2 avalanches from Path MS8 are estimated to reach the southwest end of theoperations camp with an annual return frequency. Potential consequences ofavalanches reaching this area include damage to vulnerable infrastructure (e.g. windowsor non-structural components of building, if built within the runout area) and worker injuryor fatality if workers are in the runout area when the avalanche occurs.Site Access RoadsSize 2 and 3 avalanches from Path MS5 and Size 2 avalanches from Path MS9 areestimated to reach site access roads annually. Potential consequences include damageto infrastructure and vehicles, and worker injury or fatality if workers are in the runoutarea when the avalanche occurs.Pre-production Ore Storage and Diversion Channel AreaThe pre-production ore storage and diversion channel area is exposed to Size 3avalanches from Path MS2, approximately once every 10 years. Potential consequencesare limited to damage to any vulnerable materials stored in this area during avalancheseason, as well as worker injury or fatality if workers are in the runout area when theavalanche occurs. The diversion channel is expected to be buried underneath thesnowpack during avalanche season.Avalanches Reaching Brucejack LakeAvalanches up to Size 3 may reach Brucejack Lake from Path MS1, and short steepslopes on the north side of Brucejack Lake may produce avalanches up to Size 3reaching the lake. If avalanches reach the lake when the surface is not frozen, wavesmay develop. As a result of the small size and/or slow speed of the avalanches whenthey reach the lake, these waves are not expected to be destructive.ACCESS ROADThe mine access road begins at Highway 37 near the confluence of Wildfire Creek andthe Bell Irving River, approximately 30 km south of Bell II. The road extends northwestfollowing the Wildfire Creek drainage for approximately 12 km before heading west toScott Pass (677 m elevation) and then down Scott Creek drainage to the Bowser Rivervalley (400 m elevation), 35 km from Highway 37. The access continues west along theBowser River valley for approximately 15 km to the Knipple Transfer Station.From the Knipple Transfer Station, the road ascends to the northwest to reach the southside of the toe of the Knipple Glacier, and along a short ramp to the Knipple Glacier.From here, a glacier road extends up the centre of the Knipple Glacier for approximately15 km to the mine site at approximately 1,400 m. The glacier road is proposed to belocated near the centre of the Knipple Glacier, although the location may vary dependingon crevasse restrictions.Pretium Resources Inc. 18-19 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC