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Canada
Lalor Mine (Manitoba(Snow Lake) Operation)

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 Location:
8 km W from Snow Lake, Manitoba, Canada

  Address:

Snow Lake
Manitoba, Canada
R0B 1M0
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  • Overview
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  • Mining
  • Processing
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Zinc
  • Gold
  • Silver
Mining Method
  • Mechanized Cut & Fill
  • Longhole open stoping
  • Longitudinal retreat
  • Paste backfill
Production Start...
Mine Life2031
In addition to 100% owned Lalor mine in northern Manitoba(Snow Lake operations), Company own and operate a portfolio of processing facilities, including Stall concentrator, which produces zinc and copper concentrates, and recently refurbished New Britannia mill, which produces copper concentrate and gold/silver doré. Flin Flon concentrator, which produced zinc and copper concentrates, closed in 2022 and is currently on care and maintenance. Also Company own a number of properties in the Snow Lake region within trucking distance of the Stall and New Britannia mills that have the potential to provide additional feed for our Snow Lake operations.


Owners

Source: p. 7,12
CompanyInterestOwnership
Hudbay Minerals Inc. 100 % Direct
Hudbay Minerals Inc. owns a 100% interest in the Lalor property.

Contractors

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Deposit Type

  • VMS


Summary:

The depositional environment for the mineralization at Lalor and the 1901 deposit are similar to present and past producing base metal deposits in felsic to mafic volcanic and volcaniclastic rocks in the Snow Lake mining camp. The deposits appear to have an extensive associated regional hydrothermal alteration.

The mineralized envelopes are shallow dipping, with zinc mineralization defined to date beginning at approximately 600 m from surface and extending to a depth of approximately 1,100 m. The mineralization trends about N320° to N340° azimuth and dips between 30° and 45° to the north. It has a lateral extent of about 1,400 m in the north-south direction and 800 m in the east-west direction.

Sulphide mineralization is dominated by pyrite and sphalerite. In the near solid (semi-massive) to solid (massive) sulphide sections, pyrite occurs as fine to coarse grained crystals ranging one to six millimetres and averages two to three millimetres in size. Sphalerite occurs interstitial to the pyrite. A crude bedding or lamination is locally discernable between these two sulphide minerals. Near solid coarse-grained sphalerite zones occur locally as bands or boudins that strongly suggest that remobilization took place during metamorphism.

Disseminated blebs and stringers of pyrrhotite and chalcopyrite occur locally within the massive sulphides, adjacent to and generally in the footwall of the massive sulphides. The hydrothermally altered r ........


Mining Methods

  • Mechanized Cut & Fill
  • Longhole open stoping
  • Longitudinal retreat
  • Paste backfill


Summary:

Lalor mine is a ramp and shaft accessible mine.

At Lalor, lateral development is horizontal or near horizontal tunnelling, travelable by rubber tired mechanized equipment. Ramps are typically mined at up to +/- 15% grade to provide access between levels. Rounds are 4m long and typical dimensions are 6m wide by 5m high. Standard ground support, consists of resin grouted rebar and welded wire mesh across the back and to within 1.8m of the sill on the walls and face. Mine services, including compressed air, process water and discharge water pipelines, paste backfill pipeline, power cables, leaky feeder communications antenna and ventilation duct, are installed in main levels and stope entrances.

At Lalor, main ventilation raises and ore pass raises are developed by a mining contractor using a raisebore and/or Alimak climber. Ground support and ladder ways are installed as required. Longhole slot raises, transfer ore passes, and auxiliary ventilation raises are limited to approximately 35m long and are developed using longhole conventional drop raise techniques. Drain, paste backfill and electrical cable holes are drilled using longhole or raisebore drills and are reamed to designed diameter.

There are two mining methods used at Lalor mine: variations of cut and fill and longhole open stoping (predominantly transverse longhole mining with minor longitudinal retreat).

Cut and Fill Mining
Single pass overhand mechanized cut and fill ........


Crushing and Grinding
Flow Sheet: Source

STALL MILL
Crushing
Crushing Coarse ore from the mine is transported to a primary crushing plant located at the Chisel mine site and is operated by a third-party contractor. The product from the crushing plant is then trucked to the Stall mill and placed in coarse ore bins or a stockpile. Material from the bins is reclaimed via vibrating feeders and conveyed into a Hewitt Robins 762mm x 1220mm jaw crusher. The discharge is combined with that of the secondary Symons Standard cone crusher to feed a Tyroc 2.4m x 6.1m double deck vibrating screen. The undersize from the bottom deck is conveyed to the fine ore bins (FOB) while the oversize of the two decks is combined to feed the Symons cone crusher and then recirculated to the screen deck in a closed loop.

The described crushing circuit is in the process of being decommissioned and replaced with an external crushing circuit to service both the Stall and New Britannia mills. The new external crushing circuit start-up is aligned with the New Britannia mill commissioning schedule.

Grinding
From the fine ore bins, crushed ore is conveyed to the two independent Stall and Chisel circuits. The Stall circuit, which processes approximately two thirds of the mill feed, includes a 3.2m diameter x 4.9m rod mill and a 3.8m diameter x 5.5m ball mill. The Chisel circuit has a 2.1m diameter x 3.0m rod mill and a 3.2m diameter x 4.0m ball mill.

Each rod mill discharges into a dedicated hydrocyclone feed pump box where it is combined with the ball mill discharge and with dilution water. Each hydrocyclone underflow returns to their respective ball mill. The hydrocyclone overflow from each circuit combines and discharges into the hydrocyclone overflow pump box. The product reports to a flotation feed pump box through a trash screen. Lime is added to each rod mill to control the pH in the flotation feed.

NEW BRITANNIA MILL
Grinding
The crushed material is reclaimed from the FOB via conveyors into the rod mill and then discharged into a hydrocyclone feed pump box, where it is combined with the ball mill discharge and dilution water. A variable speed hydrocyclone feed pump feeds a the hydrocyclones cluster. The hydrocyclone underflow returns to the ball mill while the overflow flows via gravity to a trash screen and then is pumped to the flotation circuit.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2022202120202019201820172016
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required*  ......  Subscription required*7,4255,9235,637
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required*  ......  Subscription required*372927
Zinc Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required*  ......  Subscription required*  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required*  ......  Subscription required*  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in doré oz  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required*
Silver Metal in doré oz  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required*
Gold Equivalent Metal in concentrate oz  ......  Subscription required*  ......  Subscription required*  ......  Subscription required  ......  Subscription required  ......  Subscription required
* Combined production for 777 Mine and Lalor Mine
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,536,780 t1,260,241 t1,293,418 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required1,290,300 t1,201,466 t1,102,034 t
Daily mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required4,500 t
Daily mining capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required6,000 t6,000 t
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required3,000 t
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Reserves at January 1, 2023:
Lalor mineral reserves and resources are estimated using NSR cut-off ranging from C$137 to C$168 per tonne. 1901 mineral reserves and resources are estimated using a minimum NSR cut-off of C$166 per tonne.

CategoryTonnage CommodityGrade
Proven & Probable 15,303,000 t Copper 0.61 %
Proven & Probable 15,303,000 t Zinc 3.31 %
Proven & Probable 15,303,000 t Gold 3.8 g/t
Proven & Probable 15,303,000 t Silver 27.8 g/t
Inferred 7,622,000 t Copper 1.1 %
Inferred 7,622,000 t Zinc 1.86 %
Inferred 7,622,000 t Gold 4.1 g/t
Inferred 7,622,000 t Silver 26 g/t

Operating Costs:

Units20222021202020192018201720162015
UG mining costs ($/t mined) CAD 136.71114.9596.5104.4294.780.166.475.2


Water Supply
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Heavy Mobile Equipment as of January 1, 2021:
HME TypeSizeQuantity
Backhoe ....................... Subscription required
Bolter ....................... Subscription required
Drill (long hole) ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required
Forklift ....................... Subscription required
Grader ....................... Subscription required
Loader (FEL) ....................... Subscription required
Load-Haul-Dump (LHD) 14 t ....................... Subscription required
Load-Haul-Dump (LHD) 18 t ....................... Subscription required
Personnel Carrier ....................... Subscription required
Scissor Lift ....................... Subscription required
Truck (boom) ....................... Subscription required
Truck (service) ....................... Subscription required
Truck (underground) 65 t ....................... Subscription required
Truck (underground) 42 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 6, 2023
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Year-end Mineral Reserves 2023
Annual Information Form 2022
Corporate Presentation 2022
Management Discussion & Analysis 2022
................................... 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
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Technical Report 2017
Annual Information Form 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Management Discussion & Analysis 2015
Pre-Feasibility Study Report 2012
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