McArthur River/Key Lake

  • McArthur River/Key Lake, located in northern Saskatchewan, Canada is the world's largest high-grade uranium operation.
  • Due to continued market weakness, in July 2018, Cameco made the decision to extend the planned 10-month production suspension of this operation for an indeterminate duration.
  • In service since 1999 and 1983 respectively, Cameco operates the ISO 14001 certified locations, which have collectively produced 535 million lbs using a variety of mining methods.
Operation(As of December 31, 2018)
McArthur River Reserves(As of December 31, 2018)

2019 Q2 Update


There was no production in the second quarter as a result of the planned production suspension that began in February 2018 and continues for an indeterminate duration due to continued weakness in the uranium market.

Our share of the cash and non-cash costs to maintain both operations during the suspension is expected to range between $7 million and $9 million per month.

A new collective agreement with unionized employees at our McArthur River/Key Lake operation has been reached. The new agreement expires on December 31, 2022.

McArthur River/Key Lake Production

Cameco's Share (million lbs)

3 months ended
June 30
6 months ended
June 30
2019 2018 2019 2018 Change 2019 Plan
- - - 0.1 (100)% -



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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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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.