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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)-856-2986
WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole stoping
  • Sub-level Retreat
Processing
  • Gravity separation
  • Concentrate leach
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life2021
Latest NewsWesdome Announces 2020 Fourth Quarter and Full Year Production Results; Provides 2021 Guidance     January 14, 2021


Owners

 
CompanyInterestOwnership
Wesdome Gold Mines Ltd. 100 % Direct

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 and deflect into and out of the shear zones.

Gold mineralization is structurally concentrated within highly strained portions of the various quartz veins. Ore microscopy (Clemson, 1989; Johnston, 1990) indicates that 60% of the gold occurs along quartz-sericite grain contacts, 32% along sulphide-gangue contacts and 1.4% within sulphide grains. The grains are generally less than 500 microns, free milling and 40 to 60% recoverable by gravity methods. Gold grains less than 5 microns account for a negligible percent of the total gold. Free gold generally occurs as a multitude of fine grains which result in a relatively low sub sampling variance generating very good assay precision for a vein type gold deposit.


Mining Methods

  • Longhole stoping
  • Sub-level Retreat


Summary:

Longhole mining was adopted as the primary mining method at Eagle River Mine in year 2001. The method was experimented with in 2 forms: Conventional Longhole and Sublevel Retreat. Conventional Longhole has been used principally for pillar recovery and non-critical stope production. The method generally uses downholes depending on ore configuration. The hole diameter is 2.5 inches. Downholes are generally drilled at 90° and upholes drilled at 70° to minimize the possibility of loose material striking employees or equipment. Hole lengths are generally limited to 13 metres, however, hole lengths of 15 metres are common. Dilution and bridging has been attributed to hole deviation. More stringent controls are being implemented to limit hole length and hence reduce these occurrences. Results to date with this method have been good.


Crushing and Grinding


Processing

  • Gravity separation
  • Concentrate leach
  • Merrill–Crowe
  • Cyanide (reagent)

Source: Subscription required

Summary:

Wesdome initially leased then subsequently acquired the former Magnacon mill and tailings facilities in 1996. The mill is 17 kilometres by road from the mine. The mill capacity was increased from 600 to 1,000 tonnes per day in 1999. Even though the addition of the cone crusher expanded capacity to the permitted level of 1,200 tonnes per day on a crushing basis, required maintenance time means the practical limit is approximately 1,050 tonnes per day as it is configured to achieve targeted gold recoveries.

The mill employs the Merrill-Crowe process for the recovery of gold from Eagle River ore with about 40% of the gold recovered into a gravity concentrate using a Knelson concentrator. The Merrill-Crowe process involves cyanide solution and zinc precipitation. Precipitate is refined on site to produce doré bars containing approximately 80%-92% gold. By-product silver is recovered at a rate of one part for every six to ten parts of gold. The doré bars are shipped to the Royal ........

Recoveries & Grades:

CommodityParameter20202019201820172016201520142013
Gold Head Grade, g/t 15.9 ^23.111.710.67.97.812.110.7
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required50,99640,25241,013
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required170,369 t173,189 t123,375 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 331 kt Gold 15.5 g/t 165,000 oz
Probable 855 kt Gold 14 g/t 385,000 oz
Proven & Probable 1,186 kt Gold 14.4 g/t 550,000 oz
Measured 25 kt Gold 10.1 g/t 8,000 oz
Indicated 355 kt Gold 9 g/t 103,000 oz
Measured & Indicated 380 kt Gold 9 g/t 111,000 oz
Inferred 403 kt Gold 12.3 g/t 159,000 oz


Heavy Mobile Equipment as of March 17, 2016:
HME TypeSizeQuantity
Drill jumbo (two boom) 3
Jumbo 1
Scoop Tram 6 cu. yd 4
Scoop Tram 4 cu. yd 3
Scoop Tram 3.5 cu. yd 1
Scoop Tram 2 cu. yd 2
Truck (haul) 8

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 23, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Management Discussion & Analysis 2017
Press Release 2017
Press Release 2017
Management Discussion & Analysis 2016
Technical Report 2016
Financial Review 2015
Management Discussion & Analysis 2015
Subscription required - Subscription is required.

News:

NewsDate
Wesdome Announces 2020 Fourth Quarter and Full Year Production Results; Provides 2021 Guidance January 14, 2021
Wesdome Announces Exploration Drilling At The Eagle River Mine Extends High Grade At Falcon 7 Zone Adjacent To Mine Workings September 30, 2020
Exploration Drilling at the Eagle River Mine Returns 314 g/t Au Over 6.0 Metres and Confirms Down Plunge Extension of the Falcon Zone to the Mine 7 Zone July 8, 2020
Wesdome Announces 2018 Fourth Quarter and Full Year Production Results; Provides 2019 Guidance January 16, 2019

Aerial view:

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