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Canada
Corner Bay Project

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 Location:
167 km NE from Chibougamau, Quebec, Canada

  Project Contacts:
311 Chemin des Mines, CP 400
Chibougamau
Quebec, Canada
G8P 2X8
Phone  ...  Subscription required
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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Copper Equivalent
Mining Method
  • Drift & Fill
  • Longhole open stoping
  • Avoca
  • Room-and-pillar
  • Backfill
Mine Life10.5 years (as of Jan 1, 2022)
Doré Copper is pursuing a hub-and-spoke development strategy that would see the Corner Bay copper-gold deposit serve as the main underground mine along with the Devlin copper deposit and the former Joe Mann gold mine providing feed to its Copper Rand mill (collectively, the Project).


Owners

Source: p. 44
CompanyInterestOwnership
Doré Copper Mining Corp. 100 % Indirect
The Copper Rand and Corner Bay – Devlin land tenure are held 100% by CBAY Minerals Inc. (CBAY), a wholly-owned subsidiary of Doré Copper.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Vein / narrow vein
  • Intrusion related
  • Hydrothermal
  • Porphyry
  • Metamorphic hosted


Summary:

From 1955 to 2008, after which the Copper Rand mill site closed, the Chibougamau mining district had produced a total of 55 Mt of ore containing 994,802 t of copper, 120 t of gold, 102 t of silver, and 72,066 t of zinc (Leclerc et al., 2017). Thus, the district is considered as the second largest mining district in the Québec portion of the AGB.

Mineral deposits of the Chibougamau area comprise the following (Guha et al., 1988; Pilote and Guha,2006):
- Synmagmatic Fe-Ti-V and Ni-Cu-platinum group element (PGE) mineralization in mafic-ultramafic layered intrusion;
- Volcanogenic Massive Sulphide deposits;
- Early polymetallic (Au-Ag- Cu-Zn-Pb) mineralization;
- Porphyritic Cu-Au ± Mo;
- Cu-Au veins in northwest-southeast and east-west shears (Chibougamau-type copper-gold); and
- Shear zone-hosted.

Corner Bay and Cedar Bay.
The Corner Bay and Cedar Bay deposits are examples of Chibougamau-type copper-gold deposits, which typically host massive to semi-massive pyrite-chalcopyrite-pyrrhotite-sphalerite-molybdenite sheared quartz veins. The main alteration assemblage consists of quartz, carbonate, sericite, chlorite, and K-feldspar with occasional albitization locally.

The Chibougamau-type deposits host copper-gold vein mineralization and are spatially associated with the Chibougamau Pluton, which hosts the Devlin deposit. The nearby DLC hosts the Corner Bay and Cedar Bay deposits as well as several other regi ........


Mining Methods

  • Drift & Fill
  • Longhole open stoping
  • Avoca
  • Room-and-pillar
  • Backfill


Summary:

The Corner Bay, Devlin and Joe Mann deposits are all characterized by high-grades and narrow vein widths. Projected mined tonnes from the Project (Corner Bay, Devlin, and Joe Mann) are expected to total 9.15 Mt, ramping up to a maximum capacity of 3,000 t/d over a mine life of 10.5 years.

Corner Bay.
Underground mining at Corner Bay would use the existing single portal and 2 km of development to three levels down to 115 m. The development would extend the decline ramps to a depth of 1,326 m. Most of the material would be mined by longhole open stoping with pillars, which is then backfilled, and by Avoca, a longitudinal longhole retreat mining method. A fleet of nine battery-electric haul trucks with trolley assist and six loaders would be required at maximum capacity. Trade off studies were completed to evaluate between a shaft, 42 t battery electric trucks with BaaS (Battery as a Service) technology and 50 t diesel trucks, and it was concluded that the use of 42 t battery electric trucks was the best economic option. In addition, the electric truck technology will provide benefits related to less ventilation requirements, better air quality and lower diesel consumption.

The mined material would be transported to surface and crushed and sorted at the Corner Bay site. Results from the material sorting testwork on material selected from the development stockpile at surface, which was extracted during the preparation of the 2008 bulk sample, indica ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Metal in concentrate M lbs 47492
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required
Copper Equivalent Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Copper Concentrate kt 85

Operational Metrics:

Metrics
Daily milling rate  ......  Subscription required
Daily mining capacity  ......  Subscription required
Daily milling capacity  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing rate  ......  Subscription required
Annual milling rate  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

Reserves at May 9, 2022:
Mineral Resources are estimated at a cut-off grade of 2.6 g/t Au at Joe Mann, 1.3% Cu at Corner Bay, 2.9 g/t Au at Cedar Bay and 1.2% Cu at Devlin.

CategoryTonnage CommodityGradeContained Metal
Measured & Indicated 3,582 kt Copper 2.51 % 198.2 M lbs
Measured & Indicated 3,582 kt Gold 0.58 g/t 66 koz
Inferred 7,180 kt Copper 3.01 % 476.5 M lbs
Inferred 7,180 kt Gold 1.08 g/t 248 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper Equivalent USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Copper Equivalent USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2022
UG mining costs ($/t mined) CAD 61 *
UG mining costs ($/t milled) CAD  ......  Subscription required
Processing costs ($/t milled) CAD  ......  Subscription required
G&A ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Closure costs $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 168.1
G&A costs $M CAD 59.8
Total OpEx $M CAD  ......  Subscription required
Mining Taxes $M CAD  ......  Subscription required
Income Taxes $M CAD  ......  Subscription required
Total Taxes $M CAD  ......  Subscription required
Royalty payments $M CAD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 0% $M CAD  ......  Subscription required
Pre-tax NPV @ 8% $M CAD  ......  Subscription required
After-tax NPV @ 0% $M CAD  ......  Subscription required
After-tax NPV @ 8% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of May 9, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Bolter ....................... Subscription required ....................... Subscription required Leased
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....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 1, 2023
....................... Subscription required ....................... Subscription required Subscription required May 9, 2022
....................... Subscription required ....................... Subscription required Subscription required May 9, 2022
....................... Subscription required ....................... Subscription required Subscription required May 9, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 12, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Corporate Presentation 2022
Corporate Presentation 2022
Preliminary Economic Assessment 2022
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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