OUR open-pit operation

Canada’s largest operating open-pit gold mine

With its Canadian Malartic and Barnat open pits, Canadian Malartic Mine is Canada’s largest operating open-pit gold mine. We are located in the Town of Malartic, in the heart of Québec’s Abitibi Gold Belt.

Developing the Barnat gold deposit, which is an extension of the current pit, is the result of the Malartic Extension Project. Started in 2017, this project first consisted of the construction of a 4-kilometre or so deviation of Route 117 to the east of the Town of Malartic. The deviation was opened to traffic in the fall of 2019 allowing the pre-commercial production of the Barnat pit.

By the numbers
  1. More than 2,100 full-time
    on the mine site in 2020

    • More than 800 CMM employees
    • Nearly 1,300 contractor employees
  2. Continuous

    • 24 hours a day, 7 days a week
    • Nearly 100 pieces of mobile equipment
  3. Our production
    in 2020

    • 20 million tonnes of ore processed at the plant
    • 568,634 ounces of gold produced
  4. Proven and probable
    reserves at December 31, 2020

    • 4.43 million ounces of gold at 1.12 g/t of gold
  • Operations expected to continue through 2029 with the operation of the Barnat pit.
Ore processing
  • The plant processes 57,000 tonnes of ore per day, on average, depending on operational availability, which was 95.25% in 2020.
  • The plant includes a crushing circuit consisting in primary and secondary crushers, which is followed by a grinding circuit. The milled ore then goes through a leach circuit, where the gold and silver are dissolved and then recovered by absorption on activated charcoal before being poured into bars. The average gold recovery rate at the Canadian Malartic Mine was approximately 87,4% in 2020.


At the end of the mine’s life
  • The Canadian Malartic pit will be 2 km long, 900 metres wide and 380 metres deep.
  • The Barnat pit will be 1.7 km long, 750 metres wide and 380 metres deep.
  • The waste dump will be 100 metres high.



When mining ceases, we plan to, among other things:

  • Revegetate the entire tailings pond and waste rock pile surface.
  • Fill the Canadian Malartic pit with mine tailings and piled waste rock from the Barnat open pit and the Odyssey underground mine operations and at the end of the underground mining operations, allow them to flood with natural groundwater and precipitation.
  • Secure the site and restore its natural appearance by conducting all required environmental monitoring.
Environmental Performance

The Canadian Malartic Mine has introduced numerous measures to reduce the potential impact of its operations, including:

  • Air quality measuring stations;
  • Dust prediction software;
  • Water trucks to spray roads and loads to reduce dust emission;
  • Acoustic stations;
  • Real-time noise tracking software.

We can completely shut down equipment when dust levels approach the levels permitted by the air quality standard or when noise levels approach the noise limits indicated in municipal by-laws and the Environmental Quality Act.

Equipment was down for more than 13,000 hours in 2020.

In 2020, the Canadian Malartic Mine fully complied with Québec standards governing air* quality, water quality, and noise. Furthermore, compliance with blasting standards was 99.1%.

* Pursuant to the Clean Air Regulation. From May 8, 2015, to December 31, 2020.

Consult our 2020 Annual Report (Available in french only)