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Canada
Eagle River Complex (Eagle River Mine, Mishi Mine)

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 Location:
49 km NW from Wawa, Ontario, Canada

  Address:
93 Mission Road PO Box 1520
Wawa
Ontario, Canada
P0S 1K0
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Fax(705)856-7173
WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level open stoping (SLOS)
  • Longhole stoping
  • Alimak
  • Cemented backfill
Production Start...
Mine Life2027
Eagle River Gold Mining Complex consists of the Eagle River Mine an underground operating mine with mineral assets, the Mishi Mine an open pit mine presently not in production but with mineral resources, and Eagle River Mill the common processing facilities.

As expected, the last of the stockpiled Mishi ore was processed during the First Quarter of 2023.


Owners

Source: p. 9,30
CompanyInterestOwnership
Wesdome Gold Mines Ltd. 100 % Indirect

Contractors

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Deposit Type

  • Mesothermal
  • Vein / narrow vein


Summary:

Both the Eagle River and Mishi deposits are mesothermal lode gold deposits hosted by Archean Greenstone Belts.

The Eagle River deposit has been described as a vein type deposit along a regional deformation zone with discrete brittle-ductile shears localized along lithological contacts (Heather 1986 and 1991).

Gold bearing quartz veins at Eagle River are hosted primarily by subvertical to steeply north dipping east-west striking shear zones within an elliptical quartz diorite stock with dimensions of 2.0 kilometres east-west and 0.5 kilometres north- south.

The quartz diorite stock intrudes a steeply dipping north-facing sequence of thin mafic to intermediate volcanic flows, flow breccias and interflow volcaniclastic rocks.

A number of different ore zones have been distinguished that constitute different segments of the overall shear zone corridor and each has its own gold grade characteristic. Mineable portions of the individual zones form ore shoots that plunge steeply to the east. The bulk of the historic production has come from Zone 8 and Zone 6, which are entirely within the intrusive quartz diorite, while Zone 2 mineralization is hosted in sheared mafic volcanic rocks just east of the stock.

In general, the ore shoots mined to date occur at a spacing of 400 metres along a 2.4 kilometre strikelength. They appear to be spatially related to an array of oblique 110º striking mafic dykes, which pre-date mineralization ........


Mining Methods

  • Sub-level open stoping (SLOS)
  • Longhole stoping
  • Alimak
  • Cemented backfill


Summary:

The Eagle River Complex(ERC) comprises of two mining operations, the active underground Eagle River Mine(ERM) and the open pit Mishi Mine which is not currently in production. Mishi has a small stockpile remaining which was processed in 2022. With the purchase of the Mill, Wesdome acquired the Magnacon Mine, however has never been active since the acquisition.

Mishi ore feed in 2021 and planned in 2022 is all stockpiled material. The Mishi pit was permitted in 2020 to be a temporary storage reservoir for Mill process water, which is to be seasonally pumped back to the Mill site for treatment and ultimate discharge to the environment. There is currently no planned production or Mineral Reserves associated with the site. There is only an Inferred Mineral Resources.

The ERM was initially mined using a shrinkage mining method before converting to its current mining method of captive sub-level open stoping with access to the sub-level provided by Alimak raises, a variant of longhole mining. The site is currently transitioning to mechanized sub-level open stoping with access to the sub-levels being provided by ramp access.

Currently, ERM utilizes a mix of captive and mechanized access to the sub-levels depending on how close the ramps are. Mechanized access is more productive, but also requires more lateral development with some areas being unable to support mechanized access. Minimum mining widths are 1.5 with 1 m of external dilution expected. The ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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^ Guidance / Forecast.

Production:

CommodityUnits2023202220212020201920182017
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required71,62558,980
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Daily milling rate  ......  Subscription required  ......  Subscription required646 t462 t619 t850 t
Daily milling capacity  ......  Subscription required  ......  Subscription required1,200 t1,200 t1,200 t1,200 t
Tonnes milled  ......  Subscription required  ......  Subscription required236,297 t168,809 t255,804 t309,841 t
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Reserves at December 31, 2022:
Mineral Reserves are reported above the 6.52g/t for Eagle River.

Mineral Resources are reported using a cut-off grade 5.36 g/t Au at Eagle River and 0.52g/t Au at Mishi.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (UG) 148 kt Gold 14.5 g/t 69,000 oz
Probable In-Situ (UG) 614 kt Gold 16.8 g/t 331,000 oz
Proven & Probable In-Situ (UG) 762 kt Gold 16.3 g/t 400,000 oz
Measured In-Situ (UG) 176 kt Gold 14.2 g/t 80,000 oz
Indicated In-Situ (UG) 290 kt Gold 11.3 g/t 106,000 oz
Measured & Indicated In-Situ (UG) 466 kt Gold 12.4 g/t 186,000 oz
Inferred In-Situ (OP) 2,300 kt Gold 1.6 g/t 120,000 oz
Inferred In-Situ (UG) 586 kt Gold 14.9 g/t 281,000 oz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Cash costs Gold USD
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 699 / oz†   845 / oz†  
All-in sustaining costs (AISC) Gold USD
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 985 / oz†   1,146 / oz†  
† Net of By-Product.
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Operating Costs:

Units20222021202020192018201720162015
Total operating costs ($/t milled) CAD 436  357  389  424  250  204  184  184  

Financials:

Units2022202120202019201820172016
Sustaining costs M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 17.2   15   16.4  
Capital expenditures M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 18.2   15   18.2  
Revenue M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 116   94.9   81.6  
Gross profit M CAD  ......  Subscription required  ......  Subscription required
Operating Income M CAD  ......  Subscription required  ......  Subscription required 52.1   31.5   26  
Pre-tax Income M CAD  ......  Subscription required  ......  Subscription required
After-tax Income M CAD  ......  Subscription required  ......  Subscription required 14.9   1.3   7.8  
Operating Cash Flow M CAD  ......  Subscription required  ......  Subscription required 46.3   27.2   22.4  
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Water Supply
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 24, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 24, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 24, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 24, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 1, 2023
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Quarterly Report 2023
Annual Information Form 2022
Financial Review 2022
Management Discussion & Analysis 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Management Discussion & Analysis 2017
Management Discussion & Analysis 2016
Press Release 2016
Technical Report 2016
Management Discussion & Analysis 2015
Pre-Feasibility Study Report 2011
Technical Report 2010
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