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• Cameco temporarily suspended production at its Cigar Lake uranium mine after an operational outage at the McClean Lake mill.

• The company also agreed to acquire an additional interest in the Cigar Lake Joint Venture, lifting its ownership to more than 57%.

• These developments affect one of the world's largest uranium mines and increase Cameco's direct exposure to the asset.

Cameco, traded as TSX:CCO, is in focus after pausing output at Cigar Lake because milling operations at McClean Lake were disrupted. The news comes with the stock last closing at CA$139.59 and a gain of 40.5% over the past year, even as it is down 5.7% over the past week and 12.5% over the past month.

At the same time, Cameco is raising its ownership in the Cigar Lake Joint Venture to more than 57%, increasing its interest in this high grade uranium source. For investors, the combination of a temporary suspension and a higher ownership stake highlights both current operational risk and a larger long term resource position tied to Cigar Lake.

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The Cigar Lake suspension is a reminder that Cameco's core uranium business is still exposed to operational bottlenecks at shared infrastructure such as Orano's McClean Lake mill. While the company currently expects milling to restart in about two weeks and keeps its 2026 production outlook unchanged, any extended interruption could affect volumes, costs, or delivery timing to customers. At the same time, lifting its stake in the Cigar Lake Joint Venture to about 57% gives Cameco a larger long term interest in what is described as one of the largest high grade uranium deposits globally. For investors, this pairs short term execution risk with increased asset concentration, as a greater share of future uranium output and reserves would be tied to a single mine.

How This Fits Into The Cameco Narrative

• The higher Cigar Lake interest increases Cameco's exposure to Tier 1 uranium supply, which aligns with the narrative that disciplined use of top tier assets can support long term contracts and margins.

• The production halt highlights the operational and supply chain risks already identified in the narrative, especially the potential impact of technical issues or infrastructure outages on volumes and costs.

• The current narrative focuses heavily on contracting momentum and Westinghouse, and may not fully reflect the financial impact if repeated or prolonged outages affect key mines like Cigar Lake.