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Canada
Windfall Lake Project

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 Location:
190 km NE from Val-d’Or, Quebec, Canada

  Project Contacts:
1440 - 155 University Ave
Toronto
Ontario, Canada
M5H 3B7
Phone  ...  Subscription required
Fax416-363-7579
EmailEmail
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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Longhole stoping
  • Longitudinal stoping
  • Cemented backfill
  • Paste backfill
Mine Life10 years (as of Jan 1, 2022)
The Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale.
Latest NewsOsisko Announces Definitive Agreement With Miyuukaa to Transport Hydroelectric Power to Windfall Project     March 16, 2023


Owners

Source: p. 59
CompanyInterestOwnership
Osisko Mining Inc. 100 % Indirect
The Windfall property is 100% owned by Osisko.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Replacement


Summary:

The Windfall deposit is classified as a pre-Temiskaming intrusion-associated gold deposit due to: 1) a temporal and spatial association of gold with felsic calc-alkaline QFP intrusions; and 2) the main gold event (i.e., vein- and replacement-type mineralization) being interpreted to pre-date known regional scale deformation.

Mineralization consists of a network of quartz-carbonate-pyrite-tourmaline veins and an associated silica-sericite-pyrite alteration assemblage. The mineralization and alteration have strike lengths of >2 km that show, as of yet, no recognized vertical zoning. Gold mineralization is only locally spatially associated with calc-alkaline QFP dikes but shows no genetic association with them. The QFP intrusions were emplaced mainly as a product of tectonism and deformation and act only as competent host rocks that concentrate deformation and gold-bearing hydrothermal fluids.

Mineralization
Gold mineralization in the Windfall deposit is observed in two main settings and include: 1) vein-type mineralization; and 2) replacement type mineralization.

Vein-type mineralization consists of grey to translucent coloured quartz veins that contain subordinate amounts of ankerite, tourmaline, pyrite and commonly visible gold. The veins have sharp contact margins that are straight or folded. Texturally these veins are massive, but locally can form laminated textures characteristic of fault-fill veins (Robert and Poulsen, 2001). The vei ........


Mining Methods

  • Longhole stoping
  • Longitudinal stoping
  • Cemented backfill
  • Paste backfill


Summary:

The Windfall Project mineralization varies in dip and thickness both along strike and at depth. All geometries are suitably extracted using the Longitudinal Longhole Stoping method with backfill.

The Windfall Project has three primary zones: Lynx (Lynx zone), Main and Underdog (Main zone). All zones trend roughly east-northeast and dip vertically between 45° to 90°. The Main zone is the western portion of the planned mining area and the Lynx zone is the eastern portion. The zones are accessed by three ramp systems, with two surface portals for transportation and material haulage.

Longitudinal longhole mining is suitable for the Windfall Project, where the dip of the mineralization is 45° or greater, and the materialized zones are of sufficient width and grade that the estimated dilution does not eliminate the profitable recovery of the material. Mining will consist of an undercut level and an overcut level, each accessed from the main ramp or an access drift. Each sill will be accessed perpendicularly from the ramp or access drift, and then developed along strike of the vein to the economic extents of the mineralization.

Once sill development is completed on each level, production holes are drilled between the sills and then blasted until the stoping panel is completed. Following cavity monitoring of the stope, the void is then prepared for backfill. Once a sufficient distance along strike (one to two stope lengths) has been extracted and back ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Payable metal koz 2942,941
Gold Metal in doré koz 2,942
Silver Payable metal koz  ......  Subscription required  ......  Subscription required
Silver Metal in doré koz  ......  Subscription required

Operational Metrics:

Metrics
Daily mining rate  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Daily processing rate  ......  Subscription required
* According to 2022 study.
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Reserves at November 25, 2022:
The Mineral Resource is reported at 3.5 g/t Au cut-off.
The Mineral Reserve is reported a 1.7-g/t marginal cut-off grade.

CategoryTonnage CommodityGradeContained Metal
Probable 12,183 kt Gold 8.06 g/t 3,159 koz
Probable 12,183 kt Silver 4.18 g/t 1,639 koz
Measured 811 kt Gold 11.4 g/t 297 koz
Measured 811 kt Silver 6.7 g/t 174 koz
Indicated 10,250 kt Gold 11.4 g/t 3,754 koz
Indicated 10,250 kt Silver 5.9 g/t 1,939 koz
Measured & Indicated 11,061 kt Gold 11.4 g/t 4,050 koz
Measured & Indicated 11,061 kt Silver 5.9 g/t 2,110 koz
Inferred 12,287 kt Gold 8.4 g/t 3,337 koz
Inferred 12,287 kt Silver 4.8 g/t 1,892 koz

Commodity Production Costs:

CommodityAverage
Cash costs Gold  ......  Subscription required&nbs
Total cash costs Gold  ......  Subscription required *†
All-in sustaining costs (AISC) Gold  ......  Subscription required *†
Assumed price Silver  ......  Subscription required *
Operating margin Gold  ......  Subscription required *
Assumed price Gold  ......  Subscription required *
* According to 2022 study / presentation.
† Net of By-Product.
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Operating Costs:

Units2022
UG mining costs ($/t milled) CAD 82.2 *
Processing costs ($/t milled) CAD  ......  Subscription required
G&A ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2022 study.
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2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $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 492.3
Refining costs $M USD  ......  Subscription required
G&A costs $M CAD 396.3
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 @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 7% $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
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Water Supply

Water requirements for the plant are divided into two main areas, industrial water and process water.

The total industrial water requirement for the process plant (including process water tank makeup) was estimated at approximately 194 m3/d.


Proposed Heavy Mobile Equipment as of November 25, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
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....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
Subscription required - Subscription is required.

Staff:

EmployeesTotal WorkforceYear
Subscription required Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Corporate Presentation 2022
Feasibility Study Report 2022
Press Release 2022
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
Preliminary Economic Assessment 2018
Press Release 2018
Preliminary Economic Assessment 2015
Subscription required - Subscription is required.

News:

NewsDate
Osisko Announces Definitive Agreement With Miyuukaa to Transport Hydroelectric Power to Windfall Project March 16, 2023
Osisko Mining Corporate Update February 22, 2023
Osisko Mining Announces C$75 Million "Bought Deal" Private Placement Of Units February 6, 2023

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