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Canada
Eagle River Mine (Eagle River Complex)

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 Location:
51 km W from Wawa, Ontario, Canada

  Address:
93 Mission Road P.O. Box 1520
Wawa
Ontario, Canada
P0S 1K0
Phone  ...  Subscription required
Fax(705)856-7173
WebsiteWeb
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  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level stoping
  • Alimak
  • Longhole stoping
  • Cemented backfill
Production Start...
Mine Life2027
Latest NewsWesdome Announces Annual Mineral Resource and Reserve Updates for Eagle River and Kiena Mine Complexes     March 13, 2023


Owners

Source: p. 25
CompanyInterestOwnership
Wesdome Gold Mines Ltd. 100 % Indirect

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Vein / narrow vein
  • Mesothermal


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 stoping
  • Alimak
  • Longhole stoping
  • Cemented backfill


Summary:

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 ore body strikes eastwest with strike length varying between 50 and 80 m depending on mining zone. Generally, 19% of the mill feed comes from sill development and 81% comes from stope production.

The main access to the ERM is via a portal, which connects to the mines through three primary ramp systems (East, West, and Central ramps). The majority of materials entering the mine and personnel access is through these ramps. Development waste rock is also handled via the ramp systems, generally being hauled to a stope requiring backfill, although some waste must be hoisted to surface.

The East or Main Ramp is the primary ramp for the mining zones. This ramp extends from surface to the deepest levels of the mine and provides access to the majority of the active mining ........


Crushing and Grinding
Flow Sheet: Source

Stockpiles and Crushing Circuit
There are three stockpile floors that can feed the mill with a front-end loader (FEL). The crushing circuit is a standard two stage process (2CB). From the stockpile a FEL deposits the ore into the jaw crusher. Coarse ore is transported by conveyor to be classified on a double deck vibrating screen. Oversize material goes to the secondary crushing and is reclassified after size reduction (cone crusher is in closed circuit with the vibrating screen). Undersize material is directed to the fine ore bin. The fine ore is transported from the fine ore bin by two conveyors to the primary ball mill (the second conveyor is fitted with a weightometer).

Grinding Circuit
The grinding circuit consists of a primary ball mill followed by a secondary ball mill in closed circuit with hydrocyclones (cyclones). The primary ball mill discharges into the cyclone pumpbox, and the slurry is then pumped to cyclones for classification. Process water (mill solutions) is added to the primary ball mill and cyclone feed pumpbox to obtain the required cyclone feed density. Lime slurry is added to the cyclone pumpbox to target the pH for cyanide leaching and downstream Merrill Crowe circuit.

Cyclone undersize material reports to the secondary ball mill, which also discharges into the cyclone pumpbox. The cyclone overflow is sent to the vibrating trash screen and via gravity, the slurry enters the thickener pumpbox to be pumped to the thickener feedbox. The trash screen oversize is collected in drums and periodically removed.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required67,31550,99640,252
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required122,405 t185,171 t157,250 t170,369 t
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Reserves at December 31, 2021:
Resources are reported using a 4.22 g/t Au cut-off grade.

Mineral Reserves are reported above a 5.5 g/t Au cut-off.

CategoryTonnage CommodityGradeContained Metal
Proven 116 kt Gold 11.3 g/t 42 koz
Probable 951 kt Gold 15.8 g/t 481 koz
Proven & Probable 1,066 kt Gold 15.3 g/t 524 koz
Measured 126,300 t Gold 13.38 g/t 54,300 oz
Indicated 338,700 t Gold 9.06 g/t 98,600 oz
Measured & Indicated 464,900 t Gold 10.23 g/t 152,900 oz
Inferred 596,100 t Gold 13.32 g/t 255,300 oz



Heavy Mobile Equipment as of December 31, 2021:
HME TypeSizeQuantityLeased or
Contractor
Drill (long hole) ....................... Subscription required
Drill (long hole) ....................... Subscription required Leased
Drill jumbo (two boom) ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required Leased
Load-Haul-Dump (LHD) 6 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 4 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 4 cu. yd ....................... Subscription required Leased
Load-Haul-Dump (LHD) 3.5 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 3.5 cu. yd ....................... Subscription required Leased
Load-Haul-Dump (LHD) 2 cu. yd ....................... Subscription required
Scissor Lift ....................... Subscription required
Scissor Lift ....................... Subscription required Leased
Truck (underground) 30 t ....................... Subscription required
Truck (underground) 30 t ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 16, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
................................... 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 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Management Discussion & Analysis 2017
Press Release 2017
Management Discussion & Analysis 2016
Technical Report 2016
Financial Review 2015
Management Discussion & Analysis 2015
Other 2014
Subscription required - Subscription is required.

News:

NewsDate
Wesdome Announces Annual Mineral Resource and Reserve Updates for Eagle River and Kiena Mine Complexes March 13, 2023
Wesdome Announces 2022 Fourth Quarter and Full Year Financial Results February 22, 2023

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