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Canada

Lynn Lake Project

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Summary

Mine TypeOpen Pit
Study CompletedFeasibility
StageConstruction
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
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SnapshotLynn Lake is one of Canada’s highest-grade open pit gold deposits. According to the 2023 Pre-Feasibility Study (PFS), the project includes two properties, MacLellan and Gordon, and will consist of two conventional open pit mines, a centralized processing plant, and a tailings management facility.

In January 2025, all required permits and pre-construction conditions were met, enabling the start of construction. On January 13, 2025, Alamos Gold announced a formal construction decision, with the development ramping up throughout the year and a groundbreaking ceremony held in March 2025.

On February 13, 2025, positive results from an internal study on the Burnt Timber and Linkwood satellite deposits were reported; these deposits are expected to supply additional mill feed from year 12, deferring lower-grade stockpiles and extending mine life to 27 years. The extension is projected to increase production and enhance project economics.
Latest NewsAlamos Gold: Public Notice - Lynn Lake Gold Project - Public Comments Invited on Proposed Amendments to the Decision Statement     March 26, 2025

Owners

SourceSource
CompanyInterestOwnership
Alamos Gold Inc. 100 % Direct
Alamos Gold Inc. owns the construction-stage Lynn Lake Gold Project.

Contractors

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Deposit type

  • Vein / narrow vein
  • Orogenic

Summary:

Deposit Types
The MacLellan and Gordon deposits can be considered as belonging to the class of gold deposits referred to as orogenic. The orogenic gold deposit model (Groves, Goldfarb, Gebre-Mariam, Hagemann, & Robert, 1998) characterizes structurally controlled gold occurrences formed during orogenesis by either metamorphic or deeply sourced magmatic fluids.

The ore bodies typically form ore shoots. An ore body can vary between 0.5–50 m wide, 100’s of meters long, and consists typically of a vein network, an en echelon vein swarm, or just of one single large vein. The depth extent of an ore body may well be much larger than its extent along strike.

All deposits are characterized by an alteration halo consisting of proximal to distal carbonatization and proximal potassic alteration. Elements enriched typically include arsenic, gold, potassium, rubidium, sulphur, antimony, tellurium, and tungsten; in some cases, also silver, boron, bismuth, cobalt, copper, and selenium are enriched.

MacLellan
Gold and silver mineralization at the MacLellan deposit are synchronous with, and spatially associated with significant D2 shear zones (Hastie, Gagnon, & Samson, 2018). The highest concentrations of Au-Ag within the MacLellan deposit are where east-west trending dextral D2 shear zones are intersected by NNE-SSW trending D4 brittle faults.

Two stages of gold mineralization at the MacLellan deposit were identified by Hastie (2018):
• Au-Ag mineralization associated with pyrrhotite and arsenopyrite replacement of iron carbonate veins parallel to D2 ductile shearing. Biotite plus silica alteration are associated with this mineralization event; and
• Spatial association with the intersection of D2 shear zones and D4 faults. The gold mineralization is characterized by fracture-filling native gold, aurostibite, and Au-rich rims and fractures in arsenopyrite.

Gordon
At the Gordon deposit, a set of extensional and shear veins developed during D2 deformation. The moderately south dipping (25°-45°) iron carbonate-quartz extension veins are preferentially developed in the iron formation, although they are observed in most lithological units. The shear veins are S2 foliation parallel. Both vein orientations show pyrite and pyrrhotite replacement of iron carbonate within the veins and the host iron formation has sulphidized replacement halos peripheral to the veins. Gold is associated with the sulphides in both the veins and sulphidized iron formation.

Weston (2014), conducted a detail investigation of high-grade intersections throughout the Gordon Deposit, concluding that:
• High grade mineralization is associated with shallow-dipping, sulphidized quartzcarbonate veins with an average wide of 9 cm.
• High-grade mineralization is also present within strongly sulphidized iron formation. The sulphide replacement zones average 2.4 m in width however range from 15 cm to 8.3 m wide and often display sharp visual contacts with weakly to non-mineralized iron formation.

Reserves

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Mining Methods

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Required Heavy Mobile Equipment

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EV - Electric

Comminution

Crushers and Mills

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Processing

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Commodity Production

CommodityUnitsAvg. AnnualLOM
Gold koz 1352,185
Silver koz 1602,623
All production numbers are expressed as metal in doré.

Operational metrics

Metrics
Daily ore mining rate  ....  Subscribe
Daily processing capacity  ....  Subscribe
Hourly processing capacity  ....  Subscribe
Annual mining rate  ....  Subscribe
Annual ore mining rate  ....  Subscribe
Annual processing capacity  ....  Subscribe
Stripping ratio  ....  Subscribe
Waste tonnes, LOM  ....  Subscribe
Ore tonnes mined, LOM  ....  Subscribe
Total tonnes mined, LOM  ....  Subscribe
Tonnes processed, LOM  ....  Subscribe
* According to 2023 study.

Production Costs

CommodityUnitsAverage
Credits (by-product) Gold USD  ....  Subscribe
Total cash costs Gold USD  ....  Subscribe
All-in sustaining costs (AISC) Gold USD  ....  Subscribe
Assumed price Silver USD  ....  Subscribe
Assumed price Gold USD  ....  Subscribe
* According to 2023 study / presentation.
** Net of By-Product.

Operating Costs

CurrencyAverage
OP mining costs ($/t mined) CAD  ....  Subscribe
OP mining costs ($/t milled) CAD  ....  Subscribe
Processing costs ($/t milled) CAD  ....  Subscribe
G&A ($/t milled) CAD  ....  Subscribe
Total operating costs ($/t milled) CAD  ....  Subscribe
* According to 2023 study.

Project Costs

MetricsUnitsLOM Total
Initial CapEx $M CAD  ......  Subscribe
Sustaining CapEx $M CAD  ......  Subscribe
Closure costs $M CAD  ......  Subscribe
Total CapEx $M CAD  ......  Subscribe
OP OpEx $M CAD  ......  Subscribe
Processing OpEx $M CAD 682
Refining and transportation $M CAD  ......  Subscribe
Transportation (haulage) costs $M CAD 74.2
G&A costs $M CAD 342.9
Total OpEx $M CAD  ......  Subscribe
Mining Taxes $M CAD  ......  Subscribe
Income Taxes $M CAD  ......  Subscribe
Total Taxes $M CAD  ......  Subscribe
Royalty payments $M CAD  ......  Subscribe
Net revenue (LOM) $M CAD  ......  Subscribe
After-tax Cash Flow (LOM) $M CAD  ......  Subscribe
After-tax NPV @ 5% $M CAD  ......  Subscribe
After-tax IRR, %  ......  Subscribe
After-tax payback period, years  ......  Subscribe

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 2, 2023
....................... Subscription required ....................... Subscription required Subscription required May 16, 2025
....................... Subscription required ....................... Subscription required Subscription required May 16, 2025

Workforce

EmployeesYear
...... Subscription required 2023

Aerial view:

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