Feasibility Study and Technical Report - Pretivm

• Middle Jurassic (175 to 172 Ma) calc-alkaline and tholeiitic back-arcmagmatism and syn- to epigenetic back-arc basin-related stratabound base andprecious metal deposits (e.g. Eskay Creek, RDN).The northwest part of Stikinia (in particular the volcanic and sedimentary rocks of theHazelton Group) and related Early Jurassic plutons, represent perhaps the most wellendowedmetallogenetic assemblage in BC. In addition to the Brucejack and SnowfieldProperties, this area also includes nearby former producers such as Eskay Creek, Silbak-Premier, Big Missouri, Dolly Varden, Torbrit Silver, Granduc, and Anyox (Figure 7.2).Furthermore, adjacent properties host significant precious and base metal resources(e.g. Kerr-Sulphurets-Mitchell (KSM) and Red Mountain deposits) as well as a number ofhigh-potential mineral occurrences (e.g. Homestake Ridge, Silver Coin, Big Missouri,Clone, and Tennyson Properties). The KSM deposits, along with the Snowfield andBrucejack Deposits, comprise what is commonly referred to as the Sulphurets MiningCamp.Several major compressional tectonic events affected rocks of the Stikine terrane innorthwestern BC throughout the Mesozoic. The earliest event in the Late Triassic to EarlyJurassic affected Palaeozoic and Triassic rocks of the Stikine assemblage and StuhiniGroup. A second, younger event in the Late Jurassic through Late Cretaceous, which hasbeen associated with accretion of the outboard Insular terranes west of the CoastalPlutonic Complex and the formation of the Skeena Fold Belt (SFB), resulted inwidespread predominantly east-verging fold and thrust deformation of rocks in westernStikinia (Figure 7.1 and Figure 7.2). Deformation associated with the Middle Jurassicaccretion of Stikinia to the North American continent appears to have mainly affectedrocks of eastern Stikinia (e.g. Evenchick et al. 2007).Pretium Resources Inc. 7-2 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC