Feasibility Study and Technical Report - Pretivm

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FULL-WIDTH UNDERCUTSThe Project mine planners proposed full-width undercutting of select stopes. Ground supportrecommendations are provided in Table 16.10. Primary stopes should be tight-filled as bestas possible.MINING THROUGH THE BRUCEJACK FAULTThe feasibility study mine plan has development (stope access drifts) sub-parallel to theBrucejack Fault Zone. At the next level of study, it is recommended that developments near orwithin the fault zone be aligned perpendicular to the fault trend to minimize the exposure offault-disturbed rock.All developments through the Brucejack Fault Zone will require support with fully grouted #7Dywidag bolts on a 1.5 m square pattern. Full coverage (sill to sill) of welded wire mesh and75 mm of fibre-reinforced shotcrete is also recommended.Stopes should be excavated in isolation and backfilled prior to any other production openingswithin the fault zone. The rock mass within the fault zone is not competent enough to formadequate rib or sill pillar strength between stopes. In each case, stopes should beconstrained to either the host or fault disturbed rock. Excavations bridging the boundary willhave unplanned dilution along the contact.The preliminary recommendation for maximum supported back hydraulic radii is 2.5 (10 m by10 m), and maximum unsupported hanging wall hydraulic radii is 3.75 (10 m by 30 m), forstopes within the fault zone. Cable bolt support consisting of 6 m single or double strandbulbed cable bolts on a 2.5 m square spacing in the back is recommended.SURFACE RAISE LOCATIONSThe finalized raise locations should avoid fault-disturbed rock, and minimize intersection ofweathered rock. The recommended pillar thickness between a raise and nearby developmentor production openings, including the decline access ramp, is 10 m.UNDERGROUND CRUSHER AND OTHER MINE INFRASTRUCTUREThe proposed crusher excavation will require upper level access for trucks and lower levelaccess for conveyor egress. The proposed excavation will consist of an upper truck dump androck breaker level, which connects via a bin and hopper system to the lower level crusherstation.A localized set of data was reviewed to estimate the geotechnical properties of the rock massat the proposed crusher location. The rock mass is entirely within the VOK D2 geotechnicaldomain. The 25 th percentile values were used for design.The excavation was designed for a factor of safety of 2.0, as the excavation must remainoperable for the life of the mine, and opportunities for rehabilitation will be limited once themine is in production. Two levels of support are recommended:• Primary support consisting of galvanized, resin-grouted rebar (or an equivalent) andwelded wire mesh (or fibre-reinforced shotcrete). The purpose of these elements isPretium Resources Inc. 16-32 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC
to support and retain material between the cable bolt plates and to provide a shell ofnear-surface support. In addition, confining surface support (e.g. steel or heavygauge mesh straps) is recommended for all noses and benches within the excavationto reduce the potential for unravelling. Fibre-reinforced shotcrete is recommendedwhen infrastructure will make rehabilitation impractical.• Secondary support consisting of cable bolts in the back and walls of the excavation.The purpose of these elements is to support larger wedges and increase long-termstability of the excavation.The crusher chamber excavation should be completed in stages from the top heading to allowsequential support installation and minimize the dimensions of unsupported spans. Aminimum radial standoff distance of 50 m is recommended to prevent stress interactionbetween the crusher and development or production openings. This recommendation alsoapplies to offset from major structures (i.e. the Brucejack Fault Zone).The ground support recommendations for the underground crusher and other mineinfrastructure excavations are summarized in Table 16.10.Pretium Resources Inc. 16-33 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
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hertz .............................
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atomic emission spectroscopy ......
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Mineable Shape Optimizer ..........
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VOK Domain 2 ......................
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1.2 PROPERTY DESCRIPTION AND LOCATI
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1.4 MINERAL RESOURCE ESTIMATESSnowd
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Table 1.2West Zone Mineral Resource
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Figure 1.1Simplified Process Flowsh
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1.7 MINING METHODSThe underground m
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Figure 1.2Overall Site LayoutE 4300
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Figure 1.4Knipple Transfer Station
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outflow. This approachdischarge thr
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summary of the overall operating co
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The Project schedule identifies the
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2.1 QUALIFIED PERSONSThe qualified
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Report Section Company QP23.0 Adjac
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4.0 PROPERTY DESCRIPTION AND LOCATI
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4.3 STATUS OF MINING TITLESThe Prop
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Figure 4.3Pretivm Mineral ClaimsSou
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5.0 ACCESSIBILITY, CLIMATE, LOCALRE
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5.2 CLIMATE AND PHYSIOGRAPHYThe cli
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6.0 HISTORYInformation in this sect
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Figure 6.1West Zone Underground Vei
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6.1 WORK COMPLETED BY SILVER STANDA
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7.0 GEOLOGICAL SETTING ANDMINERALIZ
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Figure 7.1Tectonic Setting of the B
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7.2 LOCAL GEOLOGY - SULPHURETS MINI
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Altered Stuhini Group rocks and Mit
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Figure 7.4Sulphurets Mining Camp Ge
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y the Brucejack Fault as well as by
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Previously, some of the rocks strad
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Figure 7.6Brucejack Property Geolog
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Figure 7.6 (con’t)Brucejack Prope
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more distal (i.e. down temperature)
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more heavily altered than those abo
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Figure 7.8Brucejack Property Minera
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Figure 7.10South-north Cross-sectio
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WEST ZONEThe West Zone gold-silver
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Figure 7.12VOK to West Zone Geologi
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Figure 7.14West Zone Drillholes and
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steep, is generally associated with
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Figure 7.15Trace Element Analysis b
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for which an age of c.110 Ma has be
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Figure 8.1Brucejack Deposit Mineral
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Figure 9.13D Geophysical Model Sche
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10.0 DRILLINGInformation in this se
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Figure 10.1Core in Wooden Core Boxe
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Figure 10.3Brucejack Property Diamo
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The cut PQ samples weighed approxim
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submitted to ALS. In addition, a re
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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
Page 196 and 197: For VOK and West Zone the interpola
Page 198 and 199: Table 14.9Comparison of the Mean Co
Page 200 and 201: the economic viability of the depos
Page 202 and 203: 14.15 RESOURCE REPORTINGThe mineral
Page 204 and 205: 15.0 MINERAL RESERVE ESTIMATES15.1
Page 206 and 207: Table 15.1Net Smelter Return Parame
Page 208 and 209: 15.4 MINING SHAPESAMC used the Mine
Page 210 and 211: Strike length varies considerably w
Page 212 and 213: 15.7 MINERAL RESERVESMineral reserv
Page 214 and 215: Figure 15.4Reserve Shapes and Minin
Page 216 and 217: 16.2 MINE DESIGN16.2.1 ACCESS AND R
Page 218 and 219: Figure 16.2Brucejack Twin Declines
Page 220 and 221: Figure 16.4Typical Level Plan - 1,2
Page 222 and 223: Table 16.1Development Design Parame
Page 224 and 225: Figure 16.7Mineable Stope Shapes -
Page 226 and 227: Once the stope footprint is slashed
Page 228 and 229: 16.3.3 STOPE SEQUENCEThe mining seq
Page 230 and 231: Stopes that will not be re-exposed
Page 232 and 233: Table 16.5LOM Backfilling - Waste R
Page 234 and 235: Figure 16.11Extent of Mine Developm
Page 236 and 237: • development of the 1,210 and 1,
Page 238 and 239: Figure 16.13Life of Mine Production
Page 240 and 241: Table 16.7LOM Tonnes and GradesYear
Page 242 and 243: Table 16.8Rock Mass PropertiesUnitU
Page 244 and 245: AMC estimated ore recovery in the w
Page 248 and 249: Table 16.10Mine Infrastructure Exca
Page 251 and 252: with lesser components supplied by
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Page 255 and 256: Table 16.12Underground Development
Page 257 and 258: TRANSMIXERSShotcrete will be delive
Page 259 and 260: The VOK Zone and West Zone mining a
Page 261 and 262: Figure 16.17 shows a ventilation co
Page 263 and 264: • regular inspection of the conve
Page 265 and 266: On low-head applications, a submers
Page 267 and 268: Figure 16.18Dewatering PlanPretium
Page 269 and 270: Figure 16.20CrusherThe 42 in wide b
Page 271 and 272: 16.9.3 POWER REQUIREMENTS AND ELECT
Page 273 and 274: Electrical power will be supplied t
Page 275 and 276: To supply service water to the high
Page 277 and 278: 16.9.7 WORKSHOP AND STORESThe maint
Page 279 and 280: Radio communications will be establ
Page 281 and 282: 16.9.11 PORTAL STRUCTUREA portal st
Page 283 and 284: propane consumption. Table 16.18 sh
Page 285 and 286: 16.10 PASTE FILL DISTRIBUTIONP&C co
Page 287 and 288: Figure 16.33Paste Fill Distribution
Page 289 and 290: Figure 16.35Pre-production Paste Fi
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Page 293 and 294: 17.0 RECOVERY METHODS17.1 MINERAL P
Page 295 and 296: 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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