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Canada
Borden Mine (Porcupine Operation)

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 Location:
10 km NE from Chapleau, Ontario, Canada

  Address:
4315 Gold Mine Road
South Porcupine
Ontario, Canada
P0N 1H0
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Fax(705)-235-6551
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level Retreat
  • Cemented backfill
Processing
  • Gravity separation
  • Smelting
  • ACACIA reactor
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life8 years (as of Jan 1, 2018)
Borden mine is the world’s first all-electric underground mine.
Latest NewsNewmont Goldcorp’s Borden Mine Achieves Commercial Production     October 1, 2019


Owners

Source: p. 36
CompanyInterestOwnership
Newmont Corp. 100 % Indirect
Goldcorp Borden Limited (Goldcorp) is currently exploring the Borden Gold Project.

In March 2015, Goldcorp Inc. purchased 100% of Probe Mines Limited.

On April 18, 2019, Newmont Mining Corp. and Goldcorp Inc. completed their merger to form Newmont Goldcorp Corp.

Deposit Type

  • Mesothermal


Summary:

Owing to its metamorphic grade, the Borden Gold deposit is markedly different from most known Archean-aged mesothermal gold occurrences. On the basis of visual evidence, which is yet to be supported by detailed petrographic studies, it is believed that the Borden Gold deposit is most closely associated with the disseminated gold sub-class.

The gold mineralization at the Borden Gold deposit occurs as a broad zone of disseminated and fracture-controlled sulphides within a volcano- metasedimentary package of variable composition. The main sulphides are pyrite and pyrrhotite, with the former typically dominating. The mineralization generally consists of low- to moderate-grade gold, with minor silver, and is characterized by a persistent higher-grade core surrounded by a lower-grade envelope. Results to date indicate that the higher-grade core improves in grade towards the southeast where it develops into a High-Grade Zone (HGZ) with average grades typically above 2.5 g/t Au.

The northwest portions of the deposit are characterized by local silicification but lack lithological control and quartz veining; while to the southeast a well-developed hydrothermal system consisting of local quartz flooding and potassic alteration predominates and defines the HGZ. The broad mineralized zone encompasses multiple/variable host rocks, dominated by metasedimentary horizons and subordinate intrusives of acidic to intermediate composition, all of which display feldspathic, chloritic and biotitic alteration. Outcropping in the northwest parts of the deposit, the lower-grade mineralization rarely exhibits visible gold grains, while in the southeast HGZ it is much more common, particularly in the quartz-rich core. A higher-grade core is also consistently present within the lower-grade zone, locally attaining very high grades reminiscent of the HGZ.

The deposit displays continuity and is consistently intersected along strike, reaching a current length of 3.7 kilometres, while remaining open in both the northwest and southeast directions. Structurally, the deposit is described by a consistent northeast dip and, locally, a shallow southeast plunge, which is mostly evident in the HGZ. Mineralization appears to be controlled by a ductile shear zone, which appears much better developed in the HGZ. The mineralized zone is up to 120 m wide, and has been confirmed to a vertical depth of approximately 650 m.


Mining Methods

  • Sub-level Retreat
  • Cemented backfill


Summary:

Borden mine is the world’s first all-electric underground mine.
Commercial gold production at Borden began in October 2019.
The Borden Gold Mine has an ore production capacity of 4000 tonnes per day over a mine life of up to 15 years.

Mining method:
- Sub-level retreat
- Cemented rock fill with waste backhaul from PGM for waste requirement.
- 15m longhole retreat – factored 24% dilution
- ~2000tpd ore @ 7gpt to mill using proven production rates
- 5x5m main haulage drifts
- Diesel trucks & tethered (electric) scoops until quick-charge battery alternate is viable.
- Battery electric equipment.

Overall, the best fit for Borden was a fleet comprised of equipment from Sandvik and MacLean.
• Scoops: Sandvik LH 514 E – tethered electric
• Trucks: Sandvik TH 54-0 diesel - with a firm commitment to a 40 T battery truck
• Drills: Sandvik DD 422i
• Bolters: MacLean MEM 975 Scissor Bolter
• Utility Vehicles: MacLean Cassette Carries and Scissor Lift
• Grader: MacLean conversion of a Cat 12 M2 diesel grader.


Crushing and Grinding


Processing

  • Gravity separation
  • Smelting
  • ACACIA reactor
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Ore from Borden is processed at the existing Dome mill.

Gold is recovered using a combination of gravity concentration and cyanidation techniques. The circuit consists of primary, secondary and tertiary crushing, rod/ball mill grinding, gravity concentration, cyanide leaching, carbon-in-pulp gold recovery, stripping, electro winning and refining.

Gravity gold is recovered by the use of five Knelson CD-30 Concentrators fed from the cyclone underflow. A Consep CS6000 Acacia Reactor is used to intensively leach the Knelson concentrate. The Acacia loaded solution has a dedicated electrowinning circuit. Gravity recovery accounts for up to 45% of the recovered gold, depending on ore type.

The cyclone overflows reports to a 155' thickener where the slurry density is increased to 55-60% solids. The thickener underflow feeds six leach tanks in series, which provide about 32 hours residence time.

Lime is added to the mill discharge pump boxes, thickene ........


Production:

CommodityUnitsAvg. Annual (Projected)
Gold koz 120
All production numbers are expressed as metal in doré.


Reserves at June 30, 2016:

CategoryTonnage CommodityGradeContained Metal
Probable 4.12 Mt Gold 7.14 g/t 0.95 M oz
Indicated 3.02 Mt Gold 5.77 g/t 0.56 M oz
Inferred 2.3 Mt Gold 5.49 g/t 0.41 M oz


Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Cassette Truck ....................... Subscription required ....................... Subscription required Oct 2, 2018
Grader ....................... Subscription required Apr 19, 2018
Jumbo ....................... Subscription required ....................... Subscription required Jan 31, 2018
Load-Haul-Dump (LHD) ....................... Subscription required 14 t ....................... Subscription required Sep 13, 2016
Scissor Lift ....................... Subscription required ....................... Subscription required Oct 2, 2018
Truck (boom) ....................... Subscription required ....................... Subscription required Dec 31, 2017
Truck (underground) ....................... Subscription required 42 t ....................... Subscription required Sep 13, 2016
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 22, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 22, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 22, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Other 2018
Other 2018
Other 2018
Annual Report 2017
Corporate Presentation 2017
Year-end Mineral Reserves 2017
Corporate Presentation 2016
Project Description 2016
Year-end Mineral Reserves 2016
Year-end Mineral Reserves 2015
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Newmont Goldcorp’s Borden Mine Achieves Commercial Production October 1, 2019
Newmont Goldcorp, Dignitaries Inaugurate Borden, Ontario’s ‘Mine of the Future’ September 23, 2019

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