McArthur River/Key Lake

Infrastructure and worker split image
  • McArthur River/Key Lake, located in northern Saskatchewan, Canada, are the world's largest high-grade uranium mine and mill.
  • In service since 1999 and 1983 respectively, Cameco operates the ISO 14001 certified operations, which have collectively produced 583 million pounds using a variety of mining methods.

Operation

(As of December 31, 2025)
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2649 people employed (including contractors)

McArthur River Reserves

(As of December 31, 2025)
MCA KL Average Grade
Infographic MCA Key PP Reserves
Infographic - Licensed to 2043
Infographic - total packaged production 583 million pounds of uranium concentrate from Key Lake + McArthur River since 1983 (100% basis)

Financial Reporting

For the latest financial results and updates on our operations, see our current financial reporting.

View Current Financial Report

Environment & Safety

Worker safety, environmental monitoring and proper decommissioning, after mining is completed, are of the utmost importance to Cameco.

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Reserves & Resources

Our mineral reserves and resources are the foundation of our company and fundamental to our success.

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An image of a front end loader with a barrel

Key Lake is the world’s largest high-grade uranium mill.  

An image of two employees testing water samples at key lake in a boat

Routine water sampling is part of a rigorous environmental monitoring program in place at each operation. 

An image of a slurry train arriving to McArthur River

McArthur River high-grade ore arrives as a slurry in special totes after being trucked 80 kilometres south to the Key Lake mill.  

An image of the McArthur River building with employees outside

McArthur River is the world’s largest high-grade uranium mine.  

An image of underground facility at McArthur River

Underground at McArthur River, 'snowmen' circulate a brine that keeps the porous rock surrounding the orebody frozen. 

An image of the McArthur River facility

Mining at McArthur River takes place between 530 and 640 meters below surface.  

and image of a woman testing a sample

Numerous tests to measure radiation are part of a rigorous monitoring program in place at each operation. 

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Caution about Forward-Looking Information   
This page may contain forward-looking information that is based upon the assumptions and subject to the material risks discussed on page 2 of Cameco's most recent Quarterly MD&A.

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