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Canada
Detour Lake Mine

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 Location:
140 km NE from Cochrane, Ontario, Canada

  Address:
86, 2nd St; End of HWY 652
Cochrane
Ontario, Canada
P0L 1C0
Phone+1-647-847-2089
WebsiteWeb
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
On-Site Camp 1,447 people Source:
Production Start1983
Mine Life2052
The Detour Lake mine is a large open pit operation comprised of the Detour Lake Main Pit currently in operation and the planned North Pit.


Owners

Source: p. 58
CompanyInterestOwnership
Agnico Eagle Mines Ltd. 100 % Indirect
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 combined company will continue as Agnico Eagle Mines Limited.

The Agnico Eagle Mines acquired its interest in the Detour Lake mine on February 8, 2022 as a result of the Merger. Kirkland Lake Gol acquired its interest in the Detour Lake mine on January 31, 2020 as a result of KLG’s acquisition of Detour Gold Corporation.

Contractors

ContractorContractDescriptionRef. DateExpirySource
Epiroc Canada Inc. Equipment procurement or fabrication Heavy equipment (drills) parts and maintenance. Jul 26, 2021
Toromont Industries Ltd Mining fleet and maintenance Kirkland Lake Gold currently has a maintenance and repair contract (MARC) agreement with CAT dealer Toromont for the CAT 795 truck fleet. The MARC consists of a variable sliding-scale hourly cost and a fixed overhead fee. Jul 26, 2021
unawarded or unknown Power supply The existing 180 km long powerline runs from the processing facility to a tie in at Island Falls, and thence to the Pinard substation. The 230 kV transmission line allows for the distribution of more than 85 MW of power, suitable to service the entire Detour Lake mining operation. Jul 26, 2021


Deposit Type

  • Vein / narrow vein
  • Hydrothermal

Source: Source p.96-107

Summary:

The Detour Lake and West Detour deposits are considered to be examples of orogenic greenstone-hosted hydrothermal lode gold deposits.

Greenstone-hosted hydrothermal lode gold deposits are typical of the Abitibi Greenstone Belt, and in particular the gold deposits found along the Destor–Porcupine Fault Zone from Timmins, Ontario through to Destor, Québec. These deposit types are found in greenstone belts around the world and are responsible for a large proportion of past world gold production, including most of the Canadian gold production.

The majority of Archean orogenic greenstone-hosted lode gold deposits occur within volcano–plutonic domains, which are typically distributed along crustal-scale fault zones occurring along or in close proximity to terrane or sub-province boundaries (Card et al, 1989). Elongate belts of metavolcanic and some metasedimentary rocks containing subsidiary amounts of ultramafic to felsic intrusive rocks typically dominate these domains. The intrusive rocks will have typically been emplaced in multiple pulses throughout the geologic evolution of the area. Metamorphism within the belts is generally greenschist to lower amphibolite facies. The structure of the gold districts is characterized by the presence of multiple generations of structural fabrics indicating the presence of several periods of deformation.

Mineralization
There are two recognized episodes of gold mineralization at the Detour Lake and West Detour deposits.

The first episode consists of a wide and generally auriferous sulphide-poor quartz vein stockwork formed in the hanging wall of the Sunday Lake Deformation Zone. The sulphidepoor quartz vein stockworks observed in the hanging wall have sub-vertical north or south dips and are parallel to a series of east-west trending high strain zones. These veins form a weak stockwork and are boudinaged and/or folded. The second episode is a stage of gold mineralization overprinting the early auriferous stockwork, principally in the hanging wall of the Sunday Lake Deformation Zone, with a higher sulphide content. The sulphide-rich gold mineralization predominantly fills structural sites in deformed quartz veins, fractures and veins crosscutting the foliation fabric but also in pillow breccias and selvages. The distribution of sulphide-rich mineralization is strongly controlled by the geometry of kinematic orientation (i.e., pyrite and pyrrhotite concentrations have a shallow westerly plunge similar to the plunge of the main flexure zone in the Sunday Lake Deformation Zone at an angle of about 40° (in the area of the former Campbell pit), shallowing to approximately 10° further to the west).

Detour Lake
Dimensions: Mineralization at Detour Lake is hosted within a broad corridor. In mine grid coordinates the mineralization extends from 16,900E to 20,650E, 19300N to 20,650N and 5,500 m elevation to 6,300 m elevation. This corresponds to a strike extent of 3.75 km, a width of 1.35 km, and an approximate elevation range of 800 m.

Mineralization
Gold is associated with quartz–carbonate–pyrite–pyrrhotite ± tourmaline veins and/or disseminated to very local semi-massive sulphides in hydrothermally-altered wall rocks. There are two main mineralized zones, defined as hanging wall mineralization and footwall mineralization.

Hanging Wall
The hanging wall gold mineralization occurs in several different rock units within broad subvertical mineralized envelopes and splits into several sub-vertical domains sub-parallel to the orientation of the Sunday Lake Deformation Zone. The Main Zone was the largest gold-bearing mineralized zone exploited in the period 1983– 1987 and consists of gold mineralization occurring in the chert marker horizon or in quartz and quartz–carbonate vein systems splaying from the Sunday Lake Deformation Zone. In the Campbell pit area, <1 m thick quartz veins, with a frequency of greater than one vein per metre, were part of a series of sub vertically dipping east–west-trending highly-strained zones. Gold generally occurred as free gold with these veins.

West of section 19,620E, mineralization is commonly associated with increased biotite alteration, shearing, narrow quartz veining and minor pyrite or pyrrhotite. Local zones of strong brecciation with sulphide infilling have also been recognized along with minor chalcopyrite, telluride minerals and visible gold. Gold mineralization is associated with a series of sub-vertical to arcuate deformation zones characterized by enhanced strained fabrics, well defined open-space breccias, and to a lesser degree sheeted shear-hosted veins and extensional veins. The QK Zone further to the west is open down plunge and has not been tested below 800 m. This mineralization is associated with narrow parallel to sub-parallel quartz veins, quartz boudins and sulphide rich veins/breccias with adjacent silicification and potassic alteration envelopes.

Footwall Mineralization
The Talc Zone varies in width from 4–15 m and tends to be less continuous along strike. Gold in the Talc Zone is dominantly associated with pyrite, pyrrhotite, and minor chalcopyrite along foliation planes, narrow discrete shears or strain zones, and in irregular lenses. The zones also contain short deformed lenses or boudinaged quartz veins. In some cases, it appears that the mineralization is controlled by strong fault structures containing several centimetres of gouge material.

West Detour and North Pit Areas
Dimensions: The West Detour mineralization extends from mine grid sections 14,500E to 17,600E and 19,100N to 21,300N and between elevation 5,300 and 6,300 m. This corresponds to a strike extent of 3.1 km, a width of 2.2 km, and an approximate elevation range of 1 km.

Mineralization
The M Zone lies approximately 400–500 m north of the chert maker horizon and is a westerly-trending gold system that is spatially associated with the margins of the chlorite schist unit. The chlorite schist stratigraphic horizon and associated gold mineralization was traced by drilling for approximately 5 km. The footwall and hanging wall sequence of the chlorite schist in the M Zone is variably biotite altered with fairly abundant fractures and well-defined foliation (local veining) with associated pyrite, pyrrhotite, and rarely chalcopyrite. The mineralized zones appear lensoidal and plunge 20° west. Mineralized lenses vary from 5–50 m in true width. Mineralization hosted in the QK zone is associated with narrow veins that are parallel to sub-parallel to stratigraphy, quartz boudins, and sulphide-rich veins/breccias within silicified and potassic alteration envelopes up to 25 m in true width. Gold mineralization in the North Walter Lake Zone is within a relatively weak quartz vein stockwork with a low pyrite and pyrrhotite sulphide content. Mineralization is associated with moderate to strong shearing, potassic alteration of the mafic volcanic units, narrow quartz veining and minor pyrite and pyrrhotite.

Zone 58N
Dimensions: The Zone 58N mineralized system has been intersected over an east–west strike length of 450 m, from surface to a depth of 800 m, and the mineralized system remains open at depth. The mineralization extends from approximately 595,300E to 595,750E and 5,533,700N to 5,533,800N (UTM coordinates). The width of the mineralization is variable, ranging from 4 m to >100 m at the centre of the deposit. Infill drilling has demonstrated that the geology and mineralization dip subvertically at 75º to the south.

Mineralization
Visible gold is often present and occurs within coarse pyrite or as free gold within quartz. Sulphide mineralization associated with gold ranges from 0.5–5% pyrite with minor chalcopyrite, bismuth-tellurides, molybdenite and scheelite. Gold is found within and at the margins of quartz ± tourmaline ± carbonate stockwork-type veins that infill areas of brittle deformation. Visible gold occurs in nearly every drill hole that intersects mineraliza


Mining Methods

  • Truck & Shovel / Loader

Source: p.232-243

Summary:

The Detour Lake Mine uses conventional truck-shovel open pit mining. The mine is operated using an Owner-operator mining equipment and labour strategy. Excluding the muskeg, overburden/till top layer, all material must be blasted. Pioneering drilling and blasting is required in the overburden/rock contact. Additionally, during winter months free digging of overburden material is not possible due to frost.

The Detour Lake mine is a large open pit operation comprised of the Detour Lake Main Pit currently in operation and the planned North Pit.

Design Constraints
The design of each one of the three final pits (Detour Lake, West Detour and North Pit) is guided by the respective optimized shells. The final pit design incorporates the geotechnical parameters prescribed by Golder (Golder 2019, 2020).

The Detour Lake pit design incorporates a double ramp access for most of the LOM. The final ramp and principal access will be located in the north wall. The West Detour and North Pit were designed using a single ramp access.

All ramps are designed to accommodate the safe operation of 795CAT super class trucks. Typical road width is 33 m with a total length of 40 m to allow for safety berm and drainage. Ramp widths are adjusted at the bottom of the pit to a one-way lane. Other design parameters include a ramp slope (10%), minimum curve radius (39 m) and construction constraints (super elevation, crowning).

There are a total of nine phases designed for the LOM: five for the Detour Lake Main Pit, three for West Detour and one for North Pit.

Overburden and Pre-Stripping
Bedrock at both Detour Lake and West Detour is overlain by overburden composed of layers of muskeg, till, gravel, and sand. These overburden layers may be as thick as 40 m. At the start of each mining phase, this material must be stripped prior to the drilling and blasting of rock material. Depending on the material quality, weather and moisture content, this overburden material is typically ‘free-digging’ and does not require drilling and blasting. A portion of the till material (subject to quality control specifications) is stockpiled and used for tailings management area (TMA) construction purposes. The remaining overburden is stockpiled either in the main overburden stockpile or within designated areas of the WRSFs. A portion of this material will be rehandled for the reclamation of various waste rock stockpiles and/or TMA cells. Whenever possible, this overburden is directly placed for the progressive reclamation of ultimate WRSF slopes.

Mining Operations
The Detour Lake Mine uses conventional truck-shovel open pit mining. Excluding the muskeg, overburden/till top layer, all material must be blasted. Pioneering drilling and blasting is required in the overburden/rock contact. Additionally, during winter months free digging of overburden material is not possible due to frost. The mine operation also requires the management of old underground workings.

Underground workings records are considered of good quality. The mine has been operating in historical underground working areas for the past years; the reconciliation of historical recordings and field observation of these workings is very good. The assumption that stopes were backfilled using sand/rock filled has also been confirmed. There are procedures in place to ensure safe operations in these areas. The procedures define zones classified by the risk of ground instability.

The Detour Lake Mine has used a 12 m bench-height since operations commenced. A 6 m sub-bench was used to mine the areas requiring pioneering to improve operational conditions related to boulders and pinnacles of bedrock.

Starting in mid-2020 the mine transited to a 14.5 m bench height for areas to be primarily mined by rope shovels and to 7.25 m benches in areas to be mined using hydraulic shovels. The revised mine design has led to improvements in shovel productivities.

The mine operates 24-hr per day year-round on 12 hr shifts for all operational crews. Operational teams work on a seven-day in/seven-day out rotation. The mine has implemented a successful hot-seating process for its main production equipment (shovel, trucks and drills). Management/supervisory and support personnel work at site on different schedules.

Ore Mining and Stockpiles
Whenever possible, mined ore is delivered directly to the primary crusher in order to avoid unnecessary rehandling. When the mined ore tonnage exceeds the operating capacity of the crusher, the ore is placed on one of the ROM stockpiles for later mill feed.

The ROM stockpiles are located in close proximity to the primary crusher to allow for efficient feeding into the plant. Ore in ROM stockpiles is segregated into piles consisting of similar grade material to allow for controlled feeding as required. The ROM stockpiles provide additional buffering capacity to ensure that crusher feed is maximized while also limiting excessive tramming of loading equipment between ore and waste areas in the pit.

Waste Mining
Waste mining is generally allocated to the rope shovel fleet. The grade control process also delineates waste into PAG or NAG material. PAG material must be routed to the MRS3 or MRS1 WRSFs. Overburden material is generally mined by the hydraulic shovels.

Drilling and Blasting
Drilling and blasting activities are performed by Kirkland Lake Gold personnel. Dyno Nobel is the explosives supplier. Different objectives and geological/fractural information are considered when design the patterns and loading plans. Yields vary with the different objectives (wall control, fragmentation, higher fragmentation, reduction of overcasting material) and with areas in the pit.


Crushing and Grinding
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Processing

  • Hydrochloric acid (reagent)
  • Smelting
  • Centrifugal concentrator
  • Carbon re-activation kiln
  • Gravity separation
  • Intensive Cyanidation Reactor (ICR)
  • INCO sulfur dioxide/air process
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Source
Source: Source

Summary:

The process plant is based on a robust metallurgical flowsheet designed for optimum recovery with minimum operating costs. The flowsheet is based upon unit operations that are well proven in industry.

The processing plant was designed to process ore at an average throughput of 55,000 t/d or 20 Mt/a, equivalent to milling rates of 2,500 tpoh with operating time of 92% in a 24 hour day. While operating time has lagged at around 89%, the milling has far exceeded the design rate averaging 2,952 t/hr in 2020 for 23.06 Mt milled. On at least 70 occasions in 2020, a 74 kt milled per day rate was achieved.

With the upturn of current performance of the processing plant, ongoing optimization efforts and some new capital initiatives, the LOM plan assumes that the plant throughput will increase from 23 Mt/a in 2020 to 28.0 Mt/a in 2025 and thereafter. The annual plant throughput of 28.0 Mt/a is planned to be achieved by increasing the milling rate to 3,436 t/hr and improving operating time to 93%.

In 2022, the Company completed the construction and/or installation of the fourth Detox tank, the secondary crusher screens, 14 higher capacity Kemix© screens, and the 610 refeed system. The Company also commissioned the airfield and initiated regular flights to and from Timmins and Moosonee. Major mill projects planned for 2023 include completion of the installation of the ball mill launders, the line 2 gravity feed, and the secondary crusher variable frequency drive (VFD) as well as leach tank improvements. Focus in 2023 will include engineering and securing long lead items for the maintenance storage facility, truck shop expansion and the 230 kV main substation risk mitigation projects.

Leach and Carbon-in-PuIp
The gold recovery circuit selected was a “leach circuit followed by a CIP” circuit. The designed retention time for leaching is 29 hours. The leach feed size was designed at a P80 of 95 µm. Four new leach tanks are planned to be built to support the increase in throughput to 28 Mt/a. The CIP design selected uses a carrousel type system with an average design retention time of 80 minutes in this circuit. Upgrades to the pumpcells will support the 28 Mt/a throughput rate. The VSD and motors for the CIP tails pumps will be upgraded to 500 hp from 350 hp. The current adsorbtion profile and modeling support the planned increase in throughput rate.

Acid Wash, Stripping, Electrowinning, and Refining
The stripping system uses a modified version (i.e. ,on-line electrowinning and no pregnant solution tank) of the high-pressure Zadra process to recover the gold from the loaded carbon.

The circuit incorporates an acid wash stage and is designed to handle up to 10 t of carbon per day. The acid wash stage is not currently used and will be converted into a plastic removal vessel. The build up of calcium is not sufficient to warrant the use of the acid wash vessel.

The stripping circuit is designed to handle up to 10 t of carbon per stripping cycle (approximately 8–10 hours); 100% of the carbon is regenerated in two regeneration kilns designed to handle up to 20 t of carbon per day.

The electrowinning is done “in-line” with the stripping circuit. The flow of pregnant solution is split between three rows of two electrowinning cells. One dedicated electrowinning cell handles the pregnant solution from the ILR tank.

The refining equipment is designed to handle the gold from the stripping circuit and from the gravity recovery system. The electrowinning sludge is filtered, dried and mixed with fluxes, before being smelted using induction furnaces.

The current elution capacity is estimated to be 2.5 strips of 10 t per day. In 2020, 1.75 strips per day were completed. There is sufficient capacity to cover the increased throughput for the LOM.

Thickening
The feed to the leach circuit is maintained at a density of 50–55% solids by weight using one high rate thickener. The overflow of the pre-leach thickener is recycled to the process water tank. The pre-detox thickener is used to thicken the leach tails slurry to 55–60% solids and the overflow is recycled to the process water circuit.

The thickener capacity is over 90 kt/d and can support the increase throughput without any modifications. Current flocculent consumption is low at 10 g/t.

Recoveries & Grades:

CommodityParameter2022202120202019201820172016
Gold Recovery Rate, % 9291.791.392.190.19089
Gold Head Grade, g/t 0.9710.80.921.040.930.9
^ Guidance / Forecast.

Production:
2022 production data has been reported for the period from February 8, 2022, to December 31, 2022.

CommodityProductUnits2023202220212020201920182017
Gold Payable metal koz 675-705 ^651713
Silver Payable metal koz 125
Gold Metal in doré koz 517602621571
^ Guidance / Forecast.

Operational Metrics:

Metrics202320222021202020192018
Tonnes milled 27,178 kt ^22,781,511 t24.1 Mt21.1 Mt22 Mt20.7 Mt
Daily milling rate 69,667 t65,986 t60,370 t56,600 t
Annual milling capacity 24 Mt
Daily mining rate 291 kt287 kt
Stripping / waste ratio 4 4.2
Ore tonnes mined 21.3 Mt20.1 Mt
Waste 85 Mt84.7 Mt
Total tonnes mined 106.3 Mt104.8 Mt
^ Guidance / Forecast.

Reserves at December 31, 2022:
Gold cut-off grade not less than 0.30 g/t

CategoryTonnage CommodityGradeContained Metal
Proven 107,622 kt Gold 0.91 g/t 3,133 koz
Probable 742,795 kt Gold 0.73 g/t 17,551 koz
Proven & Probable 850,417 kt Gold 0.76 g/t 20,683 koz
Measured 30,861 kt Gold 1.45 g/t 1,434 koz
Indicated 700,688 kt Gold 0.76 g/t 17,055 koz
Measured & Indicated 731,549 kt Gold 0.79 g/t 18,489 koz
Inferred 59,290 kt Gold 0.68 g/t 1,292 koz

Commodity Production Costs:

CommodityUnits202320222021202020182017
Credits (by-product) Gold USD -6 / oz   -5 / oz  
Cash costs (sold) Gold USD 625 / oz  
Total cash costs (sold) Gold USD 663 / oz   742 / oz   716 / oz  
Total cash costs Gold USD 752 / oz   660 / oz  
Total cash costs (sold) Gold USD 707 / oz ^†   657 / oz†  
Total cash costs Gold USD 655 / oz†  
All-in sustaining costs (sold) Gold USD 1,171 / oz   1,158 / oz   1,064 / oz  
^ Guidance / Forecast.
† Net of By-Product.

Operating Costs:

Units20222021
Total operating costs ($/t milled) CAD 25  25  

Financials:

Units2023202220212020201820172016
Capital expenditures (planned) M USD 379.7  
Sustaining costs M USD 214.1  295.6   228.8   174.8   102.4  
Capital expenditures M USD 394.1  414.3  341.1  
Revenue M USD 1,189  960.9   776   707.8   658.3  
Gross profit M USD 498.7  
Operating Income M USD 369.6   145.7   161.5   94.9  
After-tax Income M USD 64.2   114.5   10.4  


Water Supply
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Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Dozer (crawler) Caterpillar D10 13 Jul 26, 2021
Dozer (crawler) Caterpillar D11 4 Jul 26, 2021
Dozer (crawler) Caterpillar 844K 2 Jul 26, 2021
Drill Epiroc PV271 11 Jul 26, 2021
Drill Epiroc D65 4 Jul 26, 2021
Drill Epiroc DM45 2 Jul 26, 2021
Excavator Caterpillar 349 1 Jul 26, 2021
Excavator Caterpillar 390 4 Jul 26, 2021
Grader Caterpillar 24M 2 Jul 26, 2021
Grader Caterpillar 16M 3 Jul 26, 2021
Loader Caterpillar 930 2 Jul 26, 2021
Loader Caterpillar 993 1 Jul 26, 2021
Loader Caterpillar 980K 2 Jul 26, 2021
Loader Caterpillar 992 1 Jul 26, 2021
Shovel (hydraulic) Caterpillar 6060FSE 2 Jul 26, 2021
Shovel (hydraulic) Caterpillar 6060FS 3 Jul 26, 2021
Shovel (hydraulic) Caterpillar 6030 12 cu. m 2 Jul 26, 2021
Shovel (rope) Caterpillar 7495 48 cu. m 2 May 10, 2022
Truck Caterpillar 740 1 Jul 26, 2021
Truck (haul) Caterpillar 798 2 Feb 16, 2023
Truck (haul) Caterpillar 777 85 t 10 Jul 26, 2021
Truck (haul) Caterpillar 795 313 t 37 May 10, 2022

Mine Management:

Job TitleNameProfileRef. Date
Business Improvement Manager Larry Lazeski LinkedIn Jul 4, 2023
Consultant - Costs Paul Fournier LinkedIn Jul 26, 2021
Consultant - Mining Andre Leite LinkedIn Jul 26, 2021
Health & Safety Superintendent Douglas Brown LinkedIn Jul 4, 2023
Maintenance Superintendent Eric Saulnier LinkedIn Jul 4, 2023
Mining Manager Luke Krois LinkedIn Jul 4, 2023
Plant Maintenance Manager Raphael Boutin LinkedIn Jul 4, 2023
Sustainability & Environmental Manager Melissa Leclair LinkedIn Jul 4, 2023

Staff:

EmployeesContractorsYear
1,388 2022
1,152 2021
1,067 2020
1,001 312 2018

Corporate Filings & Presentations:

DocumentYear
Press Release 2023
Annual Information Form 2022
Corporate Presentation 2022
Form 40-F 2022
Other 2022
Annual Information Form 2021
Annual Report 2021
Management Discussion & Analysis 2021
Press Release 2021
Sustainability Report 2021
Technical Report 2021
Financial Review 2020
Management Discussion & Analysis 2020
Press Release 2020
Technical Report 2020
Management Discussion & Analysis 2019
Press Release 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Press Release 2018
Press Release 2018
Technical Report 2018
Management Discussion & Analysis 2017
Other 2017
Year-end Mineral Reserves 2017
Management Discussion & Analysis 2016
Technical Report 2016
Year-end Mineral Reserves 2016
Year-end Mineral Reserves 2016
Year-end Mineral Reserves 2015
Management Discussion & Analysis 2014
Year-end Mineral Reserves 2014
Management Discussion & Analysis 2013

Aerial view:

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