Feasibility Study and Technical Report - Pretivm

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Figure 7.2Regional Structural and Stratigraphic Setting of the Brucejack Property andSulphurets Mining Camp in Northwest BCNote:Shows significant past-producing mines, as well as selected advanced exploration projects.Rectangle represents location of Figure 7.3.Source: Ghaffari et al. (2012)Pretium Resources Inc. 7-4 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC
7.2 LOCAL GEOLOGY - SULPHURETS MINING CAMPThe Sulphurets Mining Camp, which includes the Snowfield and Brucejack Properties, islocated on the eastern limb of the broad McTagg anticlinorium, a major north-trendingmid-Cretaceous structural culmination in the western SFB (Figure 7.3). Sedimentary andvolcanic rocks of the Upper Triassic Stuhini Group form the core of the anticlinorium, andare successively replaced outwards towards the west, north, and east of the core byprogressively younger rocks of the Lower to Middle Jurassic volcanic and lessersedimentary rocks of the Hazelton Group followed by sedimentary rocks of the BowserLake Group.Details of the local geology of the Sulphurets Mining Camp in northwestern BC presentedin this section are partly drawn from existing literature, including Kirkham (1963), Grove(1986), Britton and Alldrick (1988), Alldrick and Britton (1988, 1991), Anderson (1989),Anderson and Thorkelson (1990), Kirkham (1991, 1992), Henderson et al. (1992),Roach and MacDonald (1992), Margolis (1993), Davies et al. (1994), Kirkham andMargolis (1995), Childe (1996), Macdonald et al. (1996), Lewis et al. (2001), Evenchicket al. (2007), Armstrong et al. (2011), Gagnon et al. (2012), and the Seabridge Gold Inc.(Seabridge Gold) website (accessed September 2012), and from work conducted byPretivm’s geologists.7.2.1 STRATIGRAPHIC SETTING AND MAJOR MINERAL DEPOSITSThe Stuhini Group, which generally underlies the western and northern parts of theSulphurets Mining Camp (Figure 7.4), is characterized by fine-grained and well-stratifiedsedimentary rocks and subordinate mafic volcanic arc-related rocks. The sedimentarypackage includes dark grey turbiditic siltstone, minor interbedded micritic limestone, andthick sequences of immature conglomerate and sedimentary breccia. Mafic volcanicrocks in this unit include alkalic pyroxene- and hornblende-phyric massive and pillowedbasaltic flows, flow breccia, and tuff.The central and eastern parts of the Sulphurets Mining Camp are largely underlain bysubaqueous to locally sub-aerial, arc-related volcanic and subordinate sedimentary rocksof the lower Hazelton Group, which unconformably overlie the Stuhini Group. Thelowermost unit of the lower Hazelton Group, the Lower Jurassic Jack Formation, ischaracterized by polylithic (granitoid and volcanic) pebble to boulder conglomerate andlimy fossiliferous sandstone and siltstone. The Jack Formation appears to beconformably overlain by the volcanic rocks of the lower Hazelton Group, which generallyconsist of thick massive plagioclase (± hornblende, K-feldspar, and pyroxene)-phyricandesitic and dacitic flows, breccias, and related predominantly pyroclastic fragmentalrocks, with subordinate mafic and felsic rocks and minor siltstone and mudstone layersof the Unuk River Formation. These rocks are overlain by well-bedded green, maroon,and grey andesitic to dacitic pyroclastic and epiclastic rocks, mafic flows, and minorcarbonaceous mudstone, chert and limestone of the Betty Creek Formation, which are inturn disconformably overlain by the Mount Dilworth Formation. The Mount DilworthFormation is characterized by dacitic and rhyolitic tuff, welded ash-flow tuff, volcanicPretium Resources Inc. 7-5 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC
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Report to:Pretium Resources Inc.Fea
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TABLE OF CONTENTS1.0 SUMMARY ......
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12.2 DATA VERIFICATION BY SNOWDEN .
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16.7 MOBILE EQUIPMENT REQUIREMENTS
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20.1 SUSTAINABILITY AND ENVIRONMENT
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26.4.2 HYDROGEOLOGICAL RECOMMENDATI
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Table 13.23 Occurrences of Gold in
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LIST OF FIGURESFigure 1.1 Simplifie
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Figure 16.11 Extent of Mine Develop
Page 19 and 20: hertz .............................
Page 21 and 22: atomic emission spectroscopy ......
Page 23 and 24: Mineable Shape Optimizer ..........
Page 25 and 26: VOK Domain 2 ......................
Page 27 and 28: 1.2 PROPERTY DESCRIPTION AND LOCATI
Page 29 and 30: 1.4 MINERAL RESOURCE ESTIMATESSnowd
Page 31 and 32: Table 1.2West Zone Mineral Resource
Page 33 and 34: Figure 1.1Simplified Process Flowsh
Page 35 and 36: 1.7 MINING METHODSThe underground m
Page 37 and 38: Figure 1.2Overall Site LayoutE 4300
Page 39 and 40: Figure 1.4Knipple Transfer Station
Page 41 and 42: outflow. This approachdischarge thr
Page 43 and 44: summary of the overall operating co
Page 45 and 46: The Project schedule identifies the
Page 47 and 48: 2.1 QUALIFIED PERSONSThe qualified
Page 49 and 50: Report Section Company QP23.0 Adjac
Page 51 and 52: 4.0 PROPERTY DESCRIPTION AND LOCATI
Page 53 and 54: 4.3 STATUS OF MINING TITLESThe Prop
Page 55 and 56: Figure 4.3Pretivm Mineral ClaimsSou
Page 57 and 58: 5.0 ACCESSIBILITY, CLIMATE, LOCALRE
Page 59 and 60: 5.2 CLIMATE AND PHYSIOGRAPHYThe cli
Page 61 and 62: 6.0 HISTORYInformation in this sect
Page 63 and 64: Figure 6.1West Zone Underground Vei
Page 65 and 66: 6.1 WORK COMPLETED BY SILVER STANDA
Page 67 and 68: 7.0 GEOLOGICAL SETTING ANDMINERALIZ
Page 69: Figure 7.1Tectonic Setting of the B
Page 73 and 74: Altered Stuhini Group rocks and Mit
Page 75 and 76: Figure 7.4Sulphurets Mining Camp Ge
Page 77 and 78: y the Brucejack Fault as well as by
Page 79 and 80: Previously, some of the rocks strad
Page 81 and 82: Figure 7.6Brucejack Property Geolog
Page 83 and 84: Figure 7.6 (con’t)Brucejack Prope
Page 85 and 86: more distal (i.e. down temperature)
Page 87 and 88: more heavily altered than those abo
Page 89 and 90: Figure 7.8Brucejack Property Minera
Page 91 and 92: Figure 7.10South-north Cross-sectio
Page 93 and 94: WEST ZONEThe West Zone gold-silver
Page 95 and 96: Figure 7.12VOK to West Zone Geologi
Page 97 and 98: Figure 7.14West Zone Drillholes and
Page 99 and 100: steep, is generally associated with
Page 101 and 102: Figure 7.15Trace Element Analysis b
Page 103 and 104: for which an age of c.110 Ma has be
Page 105 and 106: Figure 8.1Brucejack Deposit Mineral
Page 107 and 108: Figure 9.13D Geophysical Model Sche
Page 109 and 110: 10.0 DRILLINGInformation in this se
Page 111 and 112: Figure 10.1Core in Wooden Core Boxe
Page 113 and 114: Figure 10.3Brucejack Property Diamo
Page 115 and 116: The cut PQ samples weighed approxim
Page 117 and 118: submitted to ALS. In addition, a re
Page 119 and 120: Primary sample gold concentrations
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12.0 DATA VERIFICATIONIndependent s
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12.2 DATA VERIFICATION BY SNOWDENSn
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Figure 12.4Sample Verification Resu
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Year Program ID Laboratory ** Gravi
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13.3.2 2012 TO 2013 TEST SAMPLESIns
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Table 13.7 Conceptual Master Compos
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ALSInspectorateFire Assay (g/t) Met
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13.3.6 ORE HARDNESS TEST WORKTable
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Table 13.14 Sample Specific Gravity
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In general, there was a reduction i
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Figure 13.5 Effect of Primary Grind
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In 2012 and 2013, most of the flota
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Further cleaner tests were conducte
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Figure 13.14 Effect of Cleaner Flot
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SampleIDWZ-2CompositeCompositeBJ-AC
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The 2012 and 2013 tests routinely i
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Figure 13.17Cumulative Stage GRG ve
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Figure 13.21 Silver Cyanide Extract
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Table 13.24 Head Sample Cyanidation
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Based on the findings of the prelim
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Primary Grind/Regrind SizesConcentr
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Further cyanide leach tests were ca
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including samples with low head gra
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Grade (g/t) Recovery/Extraction (%)
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Figure 13.28 Variability Test Resul
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Table 13.31Locked Cycle Tests Resul
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Table 13.33Conventional Thickening
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13.3.11 CONCLUSIONSA review of prel
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Table 13.37Head Grade(g/t)Metallurg
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• geological interpretation and m
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to form a series of seemingly strat
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14.6 COMPOSITING OF ASSAY INTERVALS
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In the high-grade domains (includin
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Table 14.3Parameters to Describe Go
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14.8.3 HIGH-GRADE DOMAINS - PROBABI
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analysis. Any target blocks that re
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For VOK and West Zone the interpola
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Table 14.9Comparison of the Mean Co
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the economic viability of the depos
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14.15 RESOURCE REPORTINGThe mineral
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15.0 MINERAL RESERVE ESTIMATES15.1
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Table 15.1Net Smelter Return Parame
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15.4 MINING SHAPESAMC used the Mine
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Strike length varies considerably w
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15.7 MINERAL RESERVESMineral reserv
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Figure 15.4Reserve Shapes and Minin
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16.2 MINE DESIGN16.2.1 ACCESS AND R
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Figure 16.2Brucejack Twin Declines
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Figure 16.4Typical Level Plan - 1,2
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Table 16.1Development Design Parame
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Figure 16.7Mineable Stope Shapes -
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Once the stope footprint is slashed
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16.3.3 STOPE SEQUENCEThe mining seq
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Stopes that will not be re-exposed
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Table 16.5LOM Backfilling - Waste R
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Figure 16.11Extent of Mine Developm
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• development of the 1,210 and 1,
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Figure 16.13Life of Mine Production
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Table 16.7LOM Tonnes and GradesYear
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Table 16.8Rock Mass PropertiesUnitU
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AMC estimated ore recovery in the w
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FULL-WIDTH UNDERCUTSThe Project min
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Table 16.10Mine Infrastructure Exca
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with lesser components supplied by
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un was completed representing glaci
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Table 16.12Underground Development
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TRANSMIXERSShotcrete will be delive
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The VOK Zone and West Zone mining a
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Figure 16.17 shows a ventilation co
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• regular inspection of the conve
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On low-head applications, a submers
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Figure 16.18Dewatering PlanPretium
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Figure 16.20CrusherThe 42 in wide b
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16.9.3 POWER REQUIREMENTS AND ELECT
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Electrical power will be supplied t
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To supply service water to the high
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16.9.7 WORKSHOP AND STORESThe maint
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Radio communications will be establ
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16.9.11 PORTAL STRUCTUREA portal st
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propane consumption. Table 16.18 sh
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16.10 PASTE FILL DISTRIBUTIONP&C co
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Figure 16.33Paste Fill Distribution
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Figure 16.35Pre-production Paste Fi
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RoleHeadCountMaintenance (72)Mainte
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17.0 RECOVERY METHODS17.1 MINERAL P
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The process plant will consist of t
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17.1.4 PLANT DESIGNMAJOR DESIGN CRI
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• a belt conveyor, 914 mm wide by
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CONCENTRATE REGRINDINGThe flotation
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The dried tabling concentrate will
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solution strength. The solution wil
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PROCESS CONTROL AND INSTRUMENTATION
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• vendors’ instrumentation pack
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18.0 PROJECT INFRASTRUCTURE18.1 OVE
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Figure 18.1Brucejack Overall Site L
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18.2 GEOTECHNICAL18.2.1 OVERVIEWThe
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18.3 ACCESS18.3.1 ACCESS ROADSThe B
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Figure 18.3Knipple Glacier Access R
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available in the winter and also pr
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18.5 GRADING AND DRAINAGEThe site w
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AVALANCHE FREQUENCYAvalanche freque
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• portal fuel storage• conveyor
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Operations CampSize 2 avalanches fr
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Figure 18.5Access Road Avalanche Ha
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and dated June 2013. As requested b
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Figure 18.7Photo of Typical Slopes
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• the design of special towers to
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modular construction where possible
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collect waste water during maintena
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water treatment plant to increase t
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Air/vacuum valves will be installed
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Figure 18.10Foot Print of 3% Deposi
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A pre-manufactured trailer will be
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• fuel storage• vendors’ inst
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18.17 OFF-SITE INFRASTRUCTURE18.17.
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18.17.3 BOWSER AIRSTRIPRegular char
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INSTRUMENT APPROACH PROCEDURESAn IA
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AERODROME PERSONNEL AND MAINTENANCE
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TRANSPORT MODE OPTIONSTruckThere ar
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SBT has the ability to mobilize cra
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Pretivm is committed to a process t
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engage with the Nisga’a Lisims Go
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Average monthly temperature data us
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The fisheries resources and fish ha
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was conducted on the NPR values of
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all modelling exercises, the accura
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16 corridor is recovering from the
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• reporting and feedback mechanis
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Approximately 47% of the tailings w
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20.1.8 WASTE MANAGEMENTMine WastesP
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from the site. Fixed equipment, suc
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• Forest Act (BC)• Forest and R
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Table 20.5List of Federal Approvals
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21.1.2 ESTIMATE BASE DATE AND VALID
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…costs not directly attributable
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• small tools• consumables• c
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The total cost for Major Area 33 -
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The unit cost estimates are based o
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MINE OPERATING COSTSThe total under
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Table 21.7Summary of Process Operat
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Table 21.8Summary of Backfilling Op
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DescriptionLabourForceTotal Cost($/
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22.0 ECONOMIC ANALYSIS22.1 INTRODUC
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Figure 22.1Pre-tax Cash FlowCumulat
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transport the concentrate to a buil
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Figure 22.4Pre-tax Payback Period S
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Canadian development expense and 60
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23.0 ADJACENT PROPERTIESSnowden not
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23.2 HIGH PROPERTYThe Teuton Resour
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managers, and the mining manager, a
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MANAGEMENT PROCEDURESThe EPCM contr
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Figure 24.2Level 1 Execution Schedu
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Capital equipment purchases will be
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Construction work will be split int
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provided with dedicated emergency p
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econciliation to the freight consol
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PROJECT TEAM RESPONSIBILITIESIt is
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WBS Area PretivmEPCMTeamUnderground
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24.1.15 RISK MANAGEMENTA Risk Asses
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There may be opportunities to optim
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The conceptual layout is preliminar
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25.4.8 TAILINGS DELIVERY SYSTEMThe
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26.0 RECOMENDATIONS26.1 GEOLOGYThe
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• Further test work to identify t
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The estimated cost for the above-me
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• Careful planning as well as det
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26.5.6 BRUCEJACK OUTLET CONTROL STR
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• Further groundwater quality and
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27.0 REFERENCES27.1 AVALANCHE HAZAR
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Price, W. (2005). Mend Report 9.1c:
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Britton, J. M. and Alldrick, D. J.,
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Olssen. L., Jones, I.. 2012b. Preti
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28.0 CERTIFICATES OF QUALIFIED PERS
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28.2 IVOR W.O. JONES, M.SC., CP, FA
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28.3 JOHN HUANG, PH.D., P.ENG.I, Ji
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28.5 HAMISH WEATHERLY, M.SC., P.GEO
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28.7 SABRY ABDEL HAFEZ, PH.D., P.EN
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28.9 CATHERINE SCHMID, M.SC., P.ENG
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28.11 BRENT MCAFEE, P.ENG.I, Brent
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28.13 MICHAEL CHIN, P.ENG.I, Michae
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28.15 MICHAEL PAUL WISE, P.ENG., MB
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28.17 CLAYTON RICHARDS, P.ENG.I, Cl
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28.19 ALI FARAH, P.ENG.I, Ali Farah
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28.21 S. (KUMAR) SRISKANDAKUMAR, M.
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