Uranium & Fuel

Cameco’s Key Lake Mill And McArthur River Mine Return To Full Production After Flooding

By David Dalton
29 May 2026

Canada uranium company says 2026 production outlook remains unchanged

Cameco’s Key Lake Mill And McArthur River Mine Return To Full Production After Flooding
Cameco’s McArthur River uranium mine in northern Saskatchewan. Courtesy Cameco.

Canadian uranium miner Cameco announced that the Key Lake mill and McArthur River mine have returned to full production activities following a disruption caused by flooding in northern Saskatchewan.

On 10 May 2026, Cameco announced that Key Lake had temporarily halted production activities and McArthur River had reduced activities due to the impact of flooding in northern Saskatchewan.

Cameco’s northern Saskatchewan sites were not directly impacted by flood waters, but the Smoothstone River Bridge, which is on the primary route it uses to transport supplies to the McArthur River and Key Lake sites, partially collapsed due to flood waters.

There were also weight and traffic restrictions on the alternative road, which interrupted the delivery of critical operating materials.

“We are in regular contact with the Saskatchewan Ministry of Highways, and while the timing to restore access to our primary supply route is still being confirmed, we have now been able to consistently deliver the volume of critical materials required to resume full operations at Key Lake and McArthur River using the secondary route,” Cameco said in a statement.

The company added, however, that as is the case every spring season, there remains a risk that continued thawing and precipitation events could result in further road restrictions, which could cause delays in future deliveries of critical operating materials to its sites.

Cameco said its 2026 production plan for the McArthur River/Key Lake operation has not been impacted by the disruption. The company’s other major facility, Cigar Lake mine, also in northern Saskatchewan, was not impacted and continues to operate.

“Our consolidated 2026 production outlook remains unchanged at 19.5 million to 21.5 million pounds of U3O8,” Cameco said.

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