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Canada
Birchtree Mine (Manitoba Operation)

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 Location:
4 km SW from Thompson, Manitoba, Canada

  Address:
Box 5000, 1 Vale Road
Thompson
Manitoba, Canada
R8N 1P3
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Reserves
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  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Nickel
  • Copper
  • Cobalt
Mining Method
  • Cut & Fill
  • Vertical block mining (VBM)
  • Slot-Slash
The Birchtree Mine was placed on care and maintenance in the fourth quarter of 2017.


Owners

Source: p. 71
CompanyInterestOwnership
Vale S.A. 100 % Indirect

Contractors

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Deposit Type

  • Magmatic


Summary:

The sulphide mineral deposits are associated with the ultramafic intrusions within the Pipe Formation, which is part of the Opswagan Group. The sulphide deposits occur as disseminated sulphides within the ultramafics, massive sulphide veins and lenses within the ultramafic and along the contact of the ultramafic with the Pipe Formation, and as massive sulphide veins and lenses within the Pipe Formation. All mineral reserves are contained within the latter two deposit types.

The stratigraphy at the Thompson Mine is overturned and dips 65 degrees to the west. The Archean Gneisses are located in the Thompson Mine hanging wall. Unconformably overlying the gneisses are quartzite, schist, nickel mineralization, calcareous marbles and iron formation. Amphibolite dykes and pegmatites crosscut all lithologies. Ultramafic bodies (locally called peridotite) are associated with the nickel mineralization in areas of Thompson Mine. The majority of sulphide mineralization at the Birchtree Mine is Ultramafic Associated Deposits.

Deposits are generally classified as to their spatial relationship of the mineralization to ultramafic bodies:

Metasedimentary Hosted Deposits
The structurally controlled dilation sulphide matrix mineralized zones are contained within the P2 Schist. Inclusions of wall rocks and ultramafics are common in the massive sulphide. The mineralization is linear and more predictable with widths ranging from 0.3 m to 60 m. Pinch and swe ........


Mining Methods

  • Cut & Fill
  • Vertical block mining (VBM)
  • Slot-Slash


Summary:

Mining methods primarily use Vertical Block Mining (VBM), a Slot-Slash Method, with vertical blocks averaging 100 ft in height, and Cut and Fill mining. The ore is crushed underground to -15 cm and shipped to the concentrator.


Crushing and Grinding


Processing

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Summary:

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Combined production numbers are reported under Manitoba Operation

Operational Metrics:

Metrics20172016201520142013
Ore tonnes mined 329 kt503 kt564 kt545 kt613 kt

Combined reserves/resources are reported under Manitoba Operation




Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 2, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
Form 20-F 2018
Form 20-F 2017
Other 2017
Form 20-F 2016
Form 20-F 2015
Form 20-F 2014
Other 2010
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