Cameco Announces McArthur River/Key Lake Operation Resumes Production
All amounts in Canadian dollars unless specified otherwise
Cameco (TSX: CCO; NYSE: CCJ) today 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. Our 2026 consolidated production outlook remains unchanged.
On May 10, 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. While our northern Saskatchewan sites were not directly impacted by flood waters, the Smoothstone River Bridge, which is on the primary route we use 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 roadway, 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. However, 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 our sites.
