Canada

Macassa Mine

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Overview

Mine TypeUnderground
StatusActive
Commodities
  • Gold
  • Silver
Mining Method
  • Longhole stoping
  • Mechanized Cut & Fill
  • Underhand Cut & Fill
  • Overhand Cut & Fill
Backfill type ... Lock
Production Start... Lock
Mine Life... Lock
SnapshotThe Macassa mine includes Macassa mine, the nearby Macassa Near Surface ("NSUR") and Amalgamated Kirkland (“AK”) deposits.

NSUR and AK deposits have been incorporated into Macassa's production guidance for 2024 to 2026. Production from the Near Surface deposits commenced in the second quarter of 2023, with processing of the ore at the Macassa mill. The AK deposit has been added to the mining profile starting 2024 with ore forecast to be trucked and processed at the LZ5 mill circuit at the LaRonde complex starting in the second half of 2024.

During the first quarter of 2023, the Company completed the commissioning of Shaft#4. The new four-compartment shaft will have a total hoisting capacity of 4,000 tonnes per day (ore and waste) and is an important component of the plan to increase production at Macassa.

Owners

SourceSource
CompanyInterestOwnership
Agnico Eagle Mines Ltd. 100 % Direct
February 8, 2022 – Agnico Eagle Mines Limited and Kirkland Lake Gold Ltd. are pleased to announce the successful completion of the previously announced merger of equals transaction (the “Merger”).

The combined company will continue as Agnico Eagle Mines Limited.

Agnico Eagle Mines Ltd directly owns 100% of the Macassa mine.

Contractors

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Deposit type

  • Vein / narrow vein
  • Breccia pipe / Stockwork

Summary:

The gold mineralization at Macassa is found along breaks or faults, in veins as quartz filled fractures, as breccias and as sulphide rich (pyrite) zones. There are multiple mineralized breaks, named the ‘04, ‘05, No.6, Kirkland Lake Main and the Kirkland Lake North and South branches. The breaks strike 60 degrees northeast and dip 70 to 80 degrees south in keeping with the Timiskaming trend. The trend of the gold mineralization in the Kirkland Lake camp conforms to the 60 degree westerly plunge of the syenite intrusives.

The South Mine Complex (SMC) was a significant discovery, with the zone having a different character than the zones mined historically at Macassa. The SMC is associated with a cross-over structure that links the ’04 / Main Break with the Amalgamated Break. The mineralization trends parallel to the main structures but has a much flatter dip ranging from 20 to 50 degrees south. SMC mineralization has been found to have greater widths and contain higher grades than the main zones. Considerable potential exists for future exploration drilling to identify additional parallel and stacked zones located above, below and along strike of the known SMC Zone.

The gold mineralization at Macassa is located along the breaks and subordinate splays as individual fracture fill quartz veins, from several centimetres to a few meters thick. Veins may be of single, sheeted, brecciated or stacked morphology. Several generations of quartz deposition are evident from colour and textural variability and quartz veins are generally fractured. Also found are sulphide rich (pyrite) zones.

The presence of a fault splay is often a prerequisite for gold deposition. Broader zones of mineralized, brecciated and fragmented quartz are found in the footwall and hanging wall of major faults.

Gold is usually accompanied by 1% to 3% pyrite and sometimes is associated with molybdenite and/or tellurides of lead, gold, gold-silver, silver, nickel and mercury (altaite, calaverite, petzite, hessite, melanite, coloradoite). Silver is present amalgamated with the gold and in the minerals petzite and hessite.

The presence of pyrite and silicification does not guarantee gold; however, higher grade gold is generally accompanied by increased percentages of pyrite and silica.

Hematization or bleaching with carbonatization and silicification are common alterations of the wall rocks. Sericitization is a more local feature. The alteration has enriched the rocks in K2O and depleted them in Na2O.

The new discoveries in the South Mine Complex (SMC) generally are of a different style of mineralization with wide sulphide systems rather than the quartz vein mineralization that is found in the Main Break complex. Tellurides appear to be more prevalent in the SMC, compared to the historical mineralized systems, in particular the occurrence of the gold telluride mineral calaverite. These new, wide, hydrothermally altered zones could represent a new plumbing system for a southern mineralized part of the Camp parallel to the Main Break, fed by a deep porphyry body. The gold mineralization is found in carbonate altered conglomerate, tuff and porphyry, mineralized with up to 10% disseminated pyrite. Quartz veining and silicification when hosted within the porphyry may also characterize the SMC.

Panterra Geoservices (Rhys 2017) has proposed a new conceptual mineralizing model for the ’04/Main Break and SMC zones. Here the Amalgamated Break is interpreted as the main structure off which the ‘04 Break, SMC and AK zone splay and link between. Reduced, sericite- carbonate-chlorite alteration is developed extensively along the Amalgamated Break in association with largely barren, white quartz veins and may feed into the subsidiary faults. Fluids originally flowing along the Amalgamated Break may have fed into splaying structures such as the ‘04 Break and SMC. Most ore deposition has occurred in areas where carbonate-pyrite alteration is interspersed with more oxidized reddish-orange tinted alteration assemblages that occur more distally to the feeder structures, and regional magnetite-biotite-amphibole assemblages are altered to K-feldspar-hematite carbonate. The Amalgamated and ‘04 Break are interpreted to merge near the -9000 foot elevation (depth from surface) in the #3 Shaft area.

Gold Zones
The gold mineralization at Macassa is found along breaks or faults, in veins as quartz filled fractures, as breccias and as sulphide (pyrite) zones. There are several of these breaks currently identified, they are named: ‘04, ‘05, No.6, Kirkland Lake Main and the Kirkland Lake North and South branches. The breaks trend about N60°E and dip steeply, 70° to 80° to the south, keeping with the Timiskaming trend.

At Macassa, the Main Break has been mined from 396m to the 1,706m and has been considered the most important zone in the eastern part of the mine. The ‘04 Break is in the western part of the property and was the main producing break at Macassa. It has been mined by ramp above the 3400 Level (1,036m) to about the 3000 Level elevation (945m) and extended up to the 884m elevation by diamond drilling. The ‘04 Break has been mined to the bottom of the mine at the 7000 Level (2,134m) and there is potential for the mineralization to continue deeper. The ‘04 Break is located about 185m north of the Main Break and connects to it by sigmoidal cross structures. The ‘04 Break is a thrust, or reverse, fault striking N65°E and dipping 80° to the south.

The ‘05 Break is located approximately 425m north of the ‘04 Break. It splays into north and south branches to the east. The South Branch, about 365m north of the ‘04 Break, appears to correlate with the Narrows Break that extends to the east across the rest of the camp.

The gold mineralization trend in the Kirkland Lake camp conforms to the 60° westerly plunge of the syenite intrusions. Locally, the plunge of the gold mineralization depends on the intersection of the host splay structures and can be quite different from the camp trend.

In addition to the mineral trends that have been historically productive, the Company has located significant mineralization in a number of zones to the south of these breaks. The Upper D Zone strikes N28°E and dips 40° to the east. All the other zones are included in the area now called the SMC. The strike and dip of the zones in the SMC vary. The Lower D Zone strike varies from N05°E to N30°E and has a dip of 70-80°; the orientation has been confirmed through mining. It is possible that there is more than one mineralized structure/alteration halo giving the appearance of one steeply dipping structure. The Lower D North zones strike NE and dip 30-45° southeast. The other SMC zones strike N60°E, generally parallel to the main Kirkland Lake structures with varying dips from 20-60° south. The SMC, as defined to date, appears to merge with and be terminated by the ‘04 Break between the 4700 and 4900 Levels. The shallow dipping eastern portion of the SMC appears to be terminated in the down-dip component by the Amalgamated Break, close to the -5900 foot elevation.

Several strong north easterly trending cross-faults offset the mine host rocks and mineralized zones with displacement usually to the south (dextral) and up on the west side. Major cross faults are the Lakeshore Cross Fault near the east end, the Tegren in the centre and the Amikougami Creek at the west end of the mine. The major gold bearing zones have not been found west of the Amikougami Creek Fault.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

Production for the Macassa mine in 2022 is reported from February 8 to December 31. For the complete twelve months of 2022 (including the period before the Merger), total gold production at the Macassa mine was 200,288 ounces.
CommodityProductUnits2024202320222021202020192018201720162015
Gold Payable metal oz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Silver Payable metal koz  ....  Subscribe  ....  Subscribe
^ Guidance / Forecast.

Operational metrics

Metrics2024202320222021202020192018201720162015
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe324,077 t354,469 t409,064 t396,633 t369,976 tons
Daily milling rate  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Daily milling capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe2,000 t2,000 t2,000 t2,000 t
Daily mining rate  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Daily mining capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe2,200 t
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe387,054 t331,353 t369,976 tons
^ Guidance / Forecast.

Production Costs

CommodityUnits20242023202220212020201920182017
Credits (by-product) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe
Cash costs Gold USD  ....  Subscribe
Cash costs (sold) Gold USD  ....  Subscribe 414 / oz   426 / oz   523 / oz  
Total cash costs Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe
Total cash costs Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
All-in sustaining costs (sold) Gold USD  ....  Subscribe 695 / oz   713 / oz   845 / oz  
^ Guidance / Forecast.
** Net of By-Product.

Operating Costs

Currency202320222021
Total operating costs ($/t milled) CAD 503  577  540  

Financials

Units2024202320222020201920182017
Capital expenditures (planned) M USD  ....  Subscribe
Sustaining costs M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 56.1   59.9   28.4  
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 194.4   126.4   42.4  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 333.6   307.8   247.1  
Gross profit M USD  ....  Subscribe
Operating Income M USD  ....  Subscribe 177.3   145.9   90.2  
Pre-tax Income M USD
After-tax Income M USD

Heavy Mobile Equipment

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EV - Electric

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2024
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EmployeesTotal WorkforceYear
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...... Subscription required ...... Subscription required 2022
...... Subscription required 2021
...... Subscription required 2018

Aerial view:

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