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Canada
Mishi Mine (Eagle River Complex)

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 Location:
52 km W from Wawa, Ontario, Canada

  Address:
93 Mission Road PO Box 1520
Wawa
Ontario, Canada
P0S 1K0
Phone  ...  Subscription required
Fax(705)856-7173
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeStockpile
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
The primary Mishi Mine pit was mined out in 2021. Stockpiled ore at the end of the year will be processed in 2022.

Given that the Mishi open pit is currently not part of future production plans, no additional drilling has been completed or is planned since this time as focus for the drilling has been near the Eagle River mine.


Owners

Source: p. 29
CompanyInterestOwnership
Wesdome Gold Mines Ltd. 100 % Indirect

Contractors

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Deposit Type

  • Vein / narrow vein
  • Mesothermal


Summary:

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

Mineralization is hosted in the Mishibishu Deformation Zone which traverses the property over a 14 km length and is interpreted as a major regional thrust fault which follows a volcanic-sedimentary contact. The northern portion of the property is underlain by mafic volcanic rocks and subvolcanic gabbroic sills. These are overlain to the south by shallow water immature arenaceous/arkosic sediments and polymictic conglomerates, followed by deeper water silts and turbidites progressing southward.

The sequence is overturned dipping moderately north, facing south and striking 90-120º. The deformation zone is 0.5 to 1.0 km wide and characterized by strong ankerite alteration and a schistose fabric dominated by phyllosilicate minerals, sericite and chlorite. Because of the intense deformation, systematic recognition of protoliths and subunits within the deformation zone is problematic.

In the Mishi Mine area, mineralization is hosted by a series of at least 8 tabular parallel zones consisting of ankerite-sericite ± chlorite alteration zones containing 2-8% fine disseminated pyrite and a system of sub conformable, dislocated, smoky grey quartz veinlets and lenses. Veins generally vary from 5-20% of the bulk volume of the zones with individual quartz lenses commonly 5-15 cm wide.

The 8 zones recognized to date are labelled from sout ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Mishi Open pit operated intermittently from 2002 until early 2021. 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.


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.

^ Guidance / Forecast.

Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required4,3107,9857,485
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required46,405 t70,633 t152,591 t138,668 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required90,304 t170,234 t194,753 t
Waste  ......  Subscription required  ......  Subscription required382,171 t462,824 t533,753 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required4.2 2.7 2.7
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Reserves at December 31, 2021:
Resources are reported using an in-situ marginal cut-off grade of 0.52 g/t.

CategoryTonnage CommodityGradeContained Metal
Inferred 2,300 kt Gold 1.61 g/t 120,000 oz



Heavy Mobile Equipment as of December 31, 2020:
HME TypeSizeQuantityLeased or
Contractor
Dozer ....................... Subscription required Leased
Drill ....................... Subscription required Leased
Excavator ....................... Subscription required Leased
Truck (haul) 50 t ....................... Subscription required Leased
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Mine Management:

Job TitleNameProfileRef. Date
....................... 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 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Management Discussion & Analysis 2017
Press Release 2016
Press Release 2016
Technical Report 2016
Financial Review 2015
Management Discussion & Analysis 2015
Other 2014
Pre-Feasibility Study Report 2011
Technical Report 2010
Subscription required - Subscription is required.

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