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Canada
Brucejack Mine

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 Location:
61 km N from Hyder, 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
  • Longhole stoping
  • Paste backfill
Processing
  • Gravity separation
  • Smelting
  • Flotation
Mine Life14 years (as of Jan 1, 2019)
Latest NewsPretivm Achieves Above Mid-Point of 2020 Production Guidance; Significantly Reduces Debt with a Discretionary Payment of $160M; and Provides 2021 Production...     January 18, 2021


Owners

Source: p. 23
CompanyInterestOwnership
Pretium Resources Inc. 100 % Direct
The Property is 100% owned by Pretium Resources Inc. (Pretivm).

Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


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).

Visible gold and silver mineralization in the Brucejack Deposit occurs as electrum and is predominately hosted in quartz-carbonate to carbonate vein and vein breccia structural corridors within broader stockwork zones (McPherson 1994; Kirkham and Margolis 1995; Tombe et al. 2018; Board et al. submitted). Additionally, lowgrade (less than 5 g/t) gold mineralization occurs sub-microscopically in vein- and wall rock-hosted arsenian pyrite (invisible gold) throughout the Valley of the Kings Zone and possibly within the West Zone as well. Electrum-bearing quartz-carbonate veins and stockwork overprint and are co-spatial with earlier porphyry-related phyllic alteration in the Brucejack Deposit.

The Valley of the Kings Zone is currently defined over 1,200 m in east-west extent, 700 m in north-south extent, and 650 m in depth. Deep drilling has indicated that the alteration, mineralization, and veining in this zone extend to a depth of at least 1,100 m. Mineralization in the Valley of the Kings Zone is open to the east, west, and at depth. Deep exploration drilling conducted under the Flow Dome Zone in 2018 was successful in confirming the presence of Valley of the Kings Zone-style mineralization from the eastern edge of the Valley of the Kings Zone to beneath the Flow Dome Zone, which lies approximately 1,000 m further east. The West Zone is currently defined over 590 m along its northwest strike, 560 m across strike, and down to 650 m in depth, is open to the northwest, southeast, and at depth to the northeast. The Valley of the Kings Zone contains higher gold and lower silver grades than the West Zone.

Precious metal mineralization is ubiquitous throughout the vein systems, however, its continuity is not correlated to any specific geologic continuity; although mineralized structural corridors can be continuous on the meters- to tens-of-meters scale, the within-vein gold and silver distribution is highly erratic. Nevertheless, the distribution and grade of precious metal mineralization within the mineralized structural corridors within the broader stockwork system is of significant economic interest.


Mining Methods

  • Longhole stoping
  • Paste backfill


Summary:

The updated underground mine design supports the extraction of 3,800 t/d of ore through a combination of transverse and longitudinal LHOS. Closely matching the previously stated plan disclosed in the 2014 FS (Ireland et al. 2014), paste backfill and trackless mobile equipment will be employed in the majority of mining activities.

Access to the mine is via the Valley of the Kings decline, situated near the concentrator. The Valley of the Kings decline is also utilized as a conveyor way, with two conveyors installed at a combined length of 800 m. The existing West Zone portal provides the main access for large underground equipment and waste haulage.

Development initiated during the two pre-production years of the LOM continues, with the mine operating at a rate of 2,700 t/d since commercial production began in July 2017. The ramp-up period to a maximum output of 3,800 t/d occurs over three years, with production over this time averaging 1.3 Mt annually.


Crushing and Grinding


Processing

  • Gravity separation
  • Smelting
  • Flotation

Flow Sheet: Subscription required

Summary:

The Brucejack Property mineralization typically consists of quartz-carbonate-adularia, gold-silver bearing veins, stockwork and breccia zones, along with broad zones of disseminated mineralization. There is a significant portion of gold and silver present in the form of nugget or metallic gold and silver.

The concentrator was designed to process gold and silver ore at a nominal rate of 2,700 t/d to produce gold doré and gold flotation concentrate. The mill was successfully commissioned between March and May of 2017 and reached full operation in Q4 2017. In 2018, various review and assessment work was conducted to evaluate the potential of increasing mill throughput to 3,800 t/d and potential bottlenecks that may limit a further increase in the mill feed rate. Equipment suppliers and independent consultants conducted various reviews through various supporting test work and simulations. The review work indicated that with some minor modifications, such as increasing some of th ........

Recoveries & Grades:

CommodityParameter201920182017
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 8.711.99.4
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017
Gold koz  ......  Subscription required  ......  Subscription required152
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in conc./ doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at January 1, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 3.4 Mt Gold 9.5 g/t 1 M oz
Proven 3.4 Mt Silver 166.5 g/t 18.1 M oz
Probable 12.6 Mt Gold 13.4 g/t 5.4 M oz
Probable 12.6 Mt Silver 30.8 g/t 12.4 M oz
Proven & Probable 16 Mt Gold 12.6 g/t 6.4 M oz
Proven & Probable 16 Mt Silver 59.3 g/t 30.5 M oz
Measured 4.2 Mt Gold 10.71 g/t 1.5 M oz
Measured 4.2 Mt Silver 204.8 g/t 27.8 M oz
Indicated 14.4 Mt Gold 15.19 g/t 7.1 M oz
Indicated 14.4 Mt Silver 45.6 g/t 21 M oz
Measured & Indicated 18.7 Mt Gold 14.18 g/t 8.5 M oz
Measured & Indicated 18.7 Mt Silver 81.6 g/t 48.7 M oz
Inferred 7.8 Mt Gold 12 g/t 3 M oz
Inferred 7.8 Mt Silver 51.3 g/t 13 M oz

Commodity Production Costs:

CommodityUnits201920182017
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 881 / oz
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 683 / oz†
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 852 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units201920182017
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment:
HME TypeSizeQuantityRef. Date
Drill 2 Nov 3, 2019
....................... Subscription required 5 Nov 3, 2019
....................... Subscription required 2 Jun 19, 2014
....................... Subscription required 3 Nov 3, 2019
....................... Subscription required 2 Nov 3, 2019
....................... Subscription required ....................... Subscription required 8 Jun 19, 2014
....................... Subscription required ....................... Subscription required 5 Nov 3, 2019
....................... Subscription required ....................... Subscription required 1 Nov 3, 2019
....................... Subscription required ....................... Subscription required 3 Nov 3, 2019
....................... Subscription required 2 Nov 3, 2019
....................... Subscription required ....................... Subscription required 10 Nov 3, 2019
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Jul 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Management Discussion & Analysis 2017
Subscription required - Subscription is required.

News:

NewsDate
Pretivm Achieves Above Mid-Point of 2020 Production Guidance; Significantly Reduces Debt with a Discretionary Payment of $160M; and Provides 2021 Production... January 18, 2021
Pretium Resources Inc.: Discovery at the Hanging Glacier Zone with 2.1 g/t Gold Over 102 Meters, including 9.5 g/t Gold over 13 Meters Demonstrates Significant Near-Mine Exploration Potential... December 16, 2020
Pretivm Files Technical Report on the Brucejack Mine; Provides Release Date of First Quarter 2020 Results April 23, 2020
Pretivm Updates Brucejack Mine Mineral Resource, Mineral Reserve and Life of Mine Plan March 9, 2020
Pretivm Reports 2019 Results, Production Outlook and Leadership Transition Plan February 12, 2020
Pretivm Repurchases 100% of Gold Offtake Agreement; Exploration Update September 16, 2019
Pretivm Files Technical Report on the Brucejack Mine May 17, 2019
Pretium Resources Inc: Continued Robust Economics of Brucejack Mine Confirmed with Updated Mineral Reserve and Resource, 14-Year Mine Plan. April 4, 2019
Pretivm Reports 2018 Results and 2019 Outlook February 14, 2019
Pretium Resources: Brucejack Mine Production Update; 2018 Guidance January 23, 2018

Aerial view:

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