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Canada
Brucejack Mine

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 Location:
60 km N from Stewart, British Columbia, Canada

  Regional Office:
2300-1055 Dunsmuir Street Four Bentall Centre
PO Box 49334
Vancouver
British Columbia, Canada
V7X 1L4
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Paste backfill
Production Start...
Mine Life14 years (as of Jan 1, 2021)
Brucejack is one of the highest-grade operating gold mines in the world.
Latest NewsNewcrest Announces Update on Non-Binding Indicative Offer from Newmont     February 15, 2023


Owners

Source: p. 7
CompanyInterestOwnershipInvestor's Info
Newcrest Mining Ltd. 100 % Indirect
Pretium Exploration Inc. (operator) 100 % Direct
On 9 March 2022, Newcrest completed the acquisition of Pretium Resources Inc. (Pretium). Pretium owns the Brucejack mine.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Epithermal


Summary:

The Brucejack Deposit is interpreted to be a deformed porphyry-related transitional to intermediate sulphidation epithermal high-grade gold-silver vein, vein stockwork, and vein breccia deposit that formed between 184 to 183 Ma (Board and McNaughton 2013; Tombe et al. 2018; Board et al. submitted). High-grade gold-silver mineralization was formed in association with a telescoped, multi-pulsed magmatic-hydrothermal system beneath an active local volcanic center (Board et al. submitted).

The Brucejack Deposit has many characteristics in common with intermediate sulphidation epithermal systems. Intermediate sulphidation epithermal systems occur in calc-alkaline andesite-dacite arcs and can be spatially associated with porphyry systems and individual volcanic centers (Sillitoe and Hedenquist 2003).

The Brucejack Project area is largely underlain by volcano-sedimentary rocks of the Lower Jurassic Hazelton Group. These rocks unconformably overlie volcanic arc sedimentary rocks of the Upper Triassic Stuhini Group along the western-most part of the Brucejack Project area. The rocks are variably altered and deformed, with zones of intense quartz-sericite-pyrite (phyllic) alteration being associated with increased deformation due to preferential strain partitioning in sericite-rich zones. A north-south trending, broadly arcuate, concave-westward 0.5 to 1.5 km wide band of variably phyllic-altered rocks and associated quartz stockwork extends over 5 km across the ........


Mining Methods

  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Paste backfill


Summary:

Brucejack Gold Mine development has been ongoing since the start of commercial production in 2017. The execution of the mine plan closely matches the mine plan as disclosed in the 2014 FS (Ireland et al. 2014). Locations for some infrastructure items have been adjusted to improve practicality as the mine has developed. These changes include the location and type of the main dewatering system and the utilization of settling sumps to pump the sediment and slimes directly to the mill clarifier. The explosives magazine was moved to isolate the location from the main works and to allow direct ventilation exhaust to surface in the event of combustion or explosion. The layout for the underground service facilities was also modified.

The updated underground mine design supports the extraction of 3,800 t/d of ore through a combination of transverse and longitudinal LHOS. Paste backfill is integral to the mine plan to maximize both orebody recovery and mining productivity. Modern trackless mobile equipment is employed in the majority of mining activities.

A main decline, designated as the Valley of the Kings access, extends from the surface portal near the concentrator and is used to access the mine and as a conveyor way. The conveyors installed have a combined length of 800 m. The existing West Zone portal will continue to provide access (and egress) to the mine and serve as the main access for large underground equipment and waste haulage.

A fleet of ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits202320212020201920182017
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required376152
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in conc./ doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2020201920182017
Ore tonnes mined  ......  Subscription required1,359,403 t1,055,208 t552,205 t
Tonnes milled  ......  Subscription required1,303,001 t1,005,603 t532,763 t
Daily milling rate  ......  Subscription required3,570 t2,755 t2,895 t
Daily ore mining rate  ......  Subscription required3,724 t2,891 t3,001 t
Subscription required - Subscription is required.

Reserves at January 1, 2020:
Mineral resources are reported on a basis of cut-off grades of 3.5 g/t Au for the Kings Zone and 5 g/t AuEq for the West Zone.

CategoryTonnage CommodityGradeContained Metal
Proven 2.8 Mt Gold 8.1 g/t 0.7 M oz
Proven 2.8 Mt Silver 195.1 g/t 17.9 M oz
Probable 12.8 Mt Gold 8.5 g/t 3.5 M oz
Probable 12.8 Mt Silver 29.8 g/t 12.2 M oz
Proven & Probable 15.7 Mt Gold 8.4 g/t 4.2 M oz
Proven & Probable 15.7 Mt Silver 59.6 g/t 30.1 M oz
Measured 4.7 Mt Gold 8.4 g/t 1.3 M oz
Measured 4.7 Mt Silver 183.29 g/t 27.7 M oz
Indicated 18.6 Mt Gold 10.7 g/t 6.4 M oz
Indicated 18.6 Mt Silver 35.78 g/t 21.4 M oz
Measured & Indicated 23.2 Mt Gold 10.1 g/t 7.6 M oz
Measured & Indicated 23.2 Mt Silver 65.5 g/t 49.1 M oz
Inferred 9.4 Mt Gold 10.3 g/t 3.1 M oz
Inferred 9.4 Mt Silver 44.3 g/t 13.4 M oz

Commodity Production Costs:

CommodityUnits2020201920182017
Total cash costs (sold) Gold USD  ......  Subscription required 827 / oz   881 / oz  
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 623 / oz†   683 / oz†  
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 764 / oz†   852 / oz†  
† Net of By-Product.

Operating Costs:

Units2020
UG mining costs ($/t milled) USD 96
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units20232020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Growth Capital M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required 16.5   8.1  
Revenue M USD  ......  Subscription required  ......  Subscription required 454.6   177.9  
Operating Income M USD  ......  Subscription required  ......  Subscription required 150.6   52.9  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required 36.6   -16.5  
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required 197.2   73.3  
Subscription required - Subscription is required


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:
HME TypeModelSizeQuantityLeased or
Contractor
Ref. Date
Bolter ....................... Subscription required Leased Mar 9, 2020
Drill ....................... Subscription required Leased Mar 9, 2020
Drill (long hole) ....................... Subscription required Leased Mar 9, 2020
Drill jumbo (single boom) ....................... Subscription required Leased Mar 9, 2020
Drill jumbo (two boom) ....................... Subscription required Leased Mar 9, 2020
Explosives Charger ....................... Subscription required Leased Mar 9, 2020
Load-Haul-Dump (LHD) 10 cu. yd ....................... Subscription required Leased Mar 9, 2020
Load-Haul-Dump (LHD) 8 cu. yd ....................... Subscription required Leased Mar 9, 2020
Personnel Carrier ....................... Subscription required Leased Mar 9, 2020
Scissor Lift ....................... Subscription required Leased Mar 9, 2020
Shotcreter 1 Leased Mar 9, 2020
Trans Mixer ....................... Subscription required Leased Mar 9, 2020
Truck (fuel / lube) ....................... Subscription required Leased Mar 9, 2020
Truck (haul) ....................... Subscription required 50 t ....................... Subscription required Leased Feb 17, 2023
Truck (water) ....................... Subscription required Leased Mar 9, 2020
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 9, 2020
....................... Subscription required ....................... Subscription required Subscription required Mar 9, 2020
....................... Subscription required ....................... Subscription required Subscription required Oct 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 26, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Other 2022
Quarterly Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Fact Sheet 2018
Management Discussion & Analysis 2018
Press Release 2018
Management Discussion & Analysis 2017
Subscription required - Subscription is required.

News:

NewsDate
Newcrest Announces Update on Non-Binding Indicative Offer from Newmont February 15, 2023
Newmont confirms proposal to combine with Newcrest February 6, 2023

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