Summary

Deposit type

• Porphyry
• Intrusion related

Summary:

Subprovince, an Archean greenstone belt situated in the southeastern part of the Superior Province of the Canadian Shield. The Abitibi Subprovince is limited to the north by gneisses and plutons of the Opatica Subprovince, and to the south by metasediments and intrusive rocks of the Pontiac Subprovince. The contact between the Pontiac Subprovince and the rocks of the Abitibi greenstone belt is characterized by a major fault corridor, the east-west trending Larder Lake – Cadillac Fault Zone (“LLCFZ”). This structure runs from Larder Lake, Ontario through Rouyn-Noranda, Cadillac, Malartic, Val-d’Or and Louvicourt, Québec, at which point it is truncated by the Grenville Front.

The regional stratigraphy of the southeastern Abitibi area is divided into groups of alternating volcanic and sedimentary rocks, generally oriented at N280 – N330 and separated by fault zones. The main lithostratigraphic divisions in this region are, from south to north, the Pontiac Group of the Pontiac Subprovin

Mining

• Truck & Shovel / Loader
• Sub-level open stoping (SLOS)
• Longitudinal retreat
• Transverse stoping

Summary:

been a large open-pit operation using large-scale excavators and trucks. The Canadian Malartic pit was depleted in 2023 and open pit operations continue at the Barnat pit. Mining at the Odyssey project will be done using underground methods. The mine design at the Odyssey project includes a 1,800 metre deep production-services shaft with an expected capacity of approximately 20,000 tonnes of ore per day once commissioned. During the second quarter of 2023, production using the ramp at the Odyssey South deposit commenced.

Mining at the Canadian Malartic mine is by open pit method with excavators and trucks, using large scale equipment. The primary loading tools are hydraulic excavators, with wheel loaders used as a secondary loading tool. The current mine production schedule was developed to feed the mill at a nominal rate of 52,000 tonnes per day. The continuity and consistency of the mineralization, coupled with tight definition drilling, that has been confirmed by many years of mining operations, demonstrate the amenability of the mineral reserves and mineral resources to the selected mining method.

Waste material is stored north of the TSF. An estimated total tonnage of 450 Mt of waste will be placed on the waste rock pile. An in-situ compacted density of 1.96 t/m3 was used to estimate the storage volume of 230 Mm3.

The ramps and haul roads are designed to accommodate the largest equipment, which is currently the Caterpillar 793F haul truck. For double-lane traffic, provincial regulations are followed. Double lane roads are designed for all accesses. Optimization to complete mining at the bottoms of pits is planned to be single lane. The travelling surface is at least triple the width of the largest vehicle. Ramp gradients are designed at 10%.

The open pit mine life is planned to extend to 2029, with mining continuing to transition from the Canadian Malartic pit to the Barnat pit. Production will transition from the open pit to the underground between 2023 to 2029. The Odyssey underground project supports a mine life to at least 2039 with annual gold production of 500,000 to 600,000 ounces when fully ramped up on a 100% basis. Opportunities exist for supplemental production sources to increase throughput beyond the 20,000 tpd as outlined in the Technical Study (as defined herein) and utilize the excess process capacity of the 60,000 tpd Canadian Malartic plant. Exploration drilling of the East Gouldie Extension and parallel structures, while widely spaced, indicate that a corridor of mineralization extends at least 1.3 kilometres to the east of East Gouldie. Although at the very early stages, these results suggest the potential for a second production shaft that could increase throughput over the longer term. Open pit and underground exploration targets within the Canadian Malartic land package present additional potential ore sources.

Mining at the Odyssey mine will be done using underground methods. The mine design at the Od

Comminution

Crushers and Mills

Summary:

ng plant. The crushed ore feeds a conveyor to transport the ore to the covered stockpile. The ore is reclaimed from the stockpile in an underground reclaim tunnel and is conveyed to the primary grinding SAG mill in the concentrator.

Grinding circuit
The SAG mill is in a closed circuit with scalping screens and two pebble crushers. The SAG circuit product is fed to the secondary grinding ball mills, which feed the tertiary grinding ball mill to produce a final product size suitable for feeding the leach circuit. There are two secondary ball mills and each one is a closed circuit with one cluster of hydrocyclones, while the tertiary grinding ball mill requires two clusters of hydrocyclones.

The slurry is brought to a pH of approximately 11 with lime added at the SAG mill feed step. The ground slurry passes through linear screens, before the thickener, to screen out any organic material and any other tramp material that has come into the mill with the ore, which would otherwise be kept in the carbon in pulp (“CIP”) circuit by the carbon screens.

Beneficiation

• Electric furnace
• Crush & Screen plant
• Smelting
• Sulfuric acid (reagent)
• Carbon re-activation kiln
• Agitated tank (VAT) leaching
• Carbon in pulp (CIP)
• Elution
• Carbon adsorption-desorption-recovery (ADR)
• Solvent Extraction & Electrowinning
• Cyanide (reagent)

Summary:

yratory crusher followed by secondary crushing prior to grinding. Ground ore feeds successively into leach and CIP circuits. A Zadra elution circuit is used to extract the gold from the loaded carbon. Pregnant solution is processed using electrowinning and the resulting precipitate is smelted into gold/silver dore bars. Mill tails are thickened and detoxified using a Caro acid process, reducing cyanide levels below 20 parts per million. Detoxified slurry is subsequently pumped to a conventional tailings facility. The end of life of the tailings storage facility is estimated to be mid-year 2024 with the addition of the PR7 cell. From then onwards, the tailings are expected to be pumped into the Canadian Malartic pit.

PLANT
The slurry is thickened to an average of 53% solids in the pre-leach thickener before being fed to the leach circuit. The leach tanks are located outside and consist of four series of five tanks in parallel with agitators. Oxygen is added to raise the oxygen level in the solution phase in order to maintain the leach kinetics. From the leach tanks, the slurry flows by gravity to the CIP circuit. The circuit is composed of two parallel sets of Kemix CIP pump cell carousel systems. Each cell contains approximately 13 t of carbon. The loaded carbon and slurry are pumped from the cell in the first stage of the carousel circuit to a loaded carbon screen where the carbon is separated from the slurry. The slurry returns to the second stage cell of the carousel while the loaded carbon is transferred to the stripping vessels by gravity.

The Split-Zadra process is used to extract the gold from the loaded carbon. The caustic solution is heated to about 140°C and is then passed through the pressurized stripping vessel that strips the gold from the loaded carbon and sends it into the stripping solution. The solution is sent to the electrowinning circuit where gold is plated onto stainless steel wool cathodes. The plated gold is pressure washed from the cathodes and then filtered, dried and sent to a refining furnace where the gold is poured into doré bars. The bars contain a significant amount of silver that is recovered along with gold.

The stripped carbon is transferred to the carbon reactivation kilns, where it is reactivated by heating it to about 800°C in a reducing atmosphere. The carbon is then re-used in the CIP circuit. Fresh carbon is regularly added to make up for attrition losses. The activated carbon is pumped to the tank in the CIP that has been emptied when the loaded carbon has been removed to start a new tank in the carousel. Before being added to the last tank in the carousel series, the carbon is screen do ensure that no fine particles of carbon are introduced into the circuit.

The slurry flowing from the last tank in the carousel series is barren of gold and is considered as tailings. This slurry is discharged over linear safety screens as insurance against coarse carbon losses from the circuit. The slurry is

Water Supply

Summary:

200 mm diameter HDPE buried line, connected to the municipal grid located in the industrial park. The 150 mm potable water line is also buried and follows the same route as the sewage line.

Three distinct water systems are used at the Canadian Malartic mine’s processing plant. Process water comes from the pre-leach and tailing thickeners overflows and is mainly recycled at the grinding circuit. Reclaim water comes from the Southeast pond and is used if there is insufficient process water in the circuit. Lastly, fresh water, which can notably be used for process water, reagent preparation water and gland seal water, is pumped from the Johnson pond located south of the mill.

A water treatment plant has been built to treat water pumped from the Southeast Pond before discharging it into the polishing pond for a capacity of 1,000 m3 /hour. The effluent treatment plant (“ETP”) is used mainly for cyanide destruction, dissolved metal ions and total suspended solids removal. It is a common oxidation process (hydrogen peroxide and copper sulphate) followed by the addition of a metal precipitant, addition of iron sulphate as a coagulant and the addition of a flocculant. The discharge of the ETP is then filtered by geotubes located at the polishing pond prior to final discharge to the environment. Treatment occurs mainly in the spring when ice melting raises the pond’s levels or during the summer.

Commodity Production

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
General Director	Christian Roy		Apr 2, 2024
General Manager	Patrick Mercier		Apr 2, 2024