| Cameco Provides Production Update; Strategically Well-Positioned for Continued Long-Term Value Creation 
 businesswire.com
 
 All amounts in Canadian dollars unless specified otherwise
 
 SASKATOON, Saskatchewan--( BUSINESS WIRE)--Cameco (TSX: CCO; NYSE: CCJ)  provided an operational update today regarding its 2025 production  plans. Development delays in transitioning the McArthur River mine to  new mining areas are expected to defer the extraction of pounds planned  in 2025 and therefore impact our 2025 production forecast. However,  strong performance at the Cigar Lake mine provides an opportunity to  partially offset the deferred McArthur River production. We believe our  balanced and disciplined strategy and embedded risk management, which  includes diversified production assets and access to multiple sources of  supply, position us well to effectively mitigate the impact of these  types of disruptions, meet our delivery commitments, and continue to  deliver long-term value.
 
 At the beginning of 2025, we highlighted several potential risks to the  McArthur River mine’s production schedule that could impact the timing  of packaged production from the Key Lake mill and our consolidated  production outlook for 2025. The risks included development delays and  the expected timing of ground freezing as the mine transitioned into two  new mining areas, as well as access to adequate skilled labour, and the  timing of commissioning for new customized equipment. The impact of  these risks was dependent on the magnitude of the delay, the McArthur  River mine’s ability to substitute feed for the Key Lake mill with  production from alternative mining areas, and our ability to offset  reduced production from McArthur River/Key Lake with additional  production from the Cigar Lake mine. We have determined that we are  unable to fully mitigate the expected impact of the delayed development  and slower than anticipated ground freezing in the first half of 2025.
 
 Production from the McArthur River/Key Lake operation is now anticipated  to be between 14 million and 15 million pounds of uranium concentrate  (U3O8) (100% basis; 9.8 million to 10.5 million pounds our share) in 2025, down from our previous forecast of 18 million pounds U3O8 (100% basis; 12.6 million pounds our share). At the Cigar Lake mine, we continue to expect to produce 18 million pounds U3O8  (100% basis; 9.8 million pounds our share) this year, however  performance to date at Cigar Lake has been strong, creating an  opportunity to potentially offset up to 1 million pounds (100% basis) of  the shortfall at the McArthur River/Key Lake operation.
 
 Cameco’s strategy, which aligns our marketing, operational and financial  decisions to capture full-cycle value, positions us to effectively  manage the expected production shortfall and meet our delivery  commitments to our customers. With favourable market prices for uranium  today, we continue to have the option to buy in the spot market if it is  advantageous for us to do so. However, we plan our supply sources  several years prior to delivery to mitigate the impact of potential  disruptions. Therefore, beyond production and spot market purchases, we  have the flexibility to source material through various other means,  including using our inventory, borrowing product, and pulling forward  long-term purchases. Any uranium we do not produce this year will remain  available to us and, with increasing upstream supply pressures,  potentially become more valuable when delivered in the future. We have  maintained exposure to higher prices under both the market-related  contracts in our long-term portfolio and our pipeline of contract  negotiations, which we expect will generate long-term value for Cameco.  We have also maintained a strong balance sheet to help us self-manage  risk.
 
 This unplanned event may lead to variability in the other outlook  provided in our second quarter Management’s Discussion and Analysis  (MD&A) for 2025; however, it is too soon to quantify the impact. We  will provide an update when we better understand the implications of the  deferred production.
 
 The McArthur River mine is owned 69.805% by Cameco and 30.195% by Orano.  The Key Lake mill is owned 83.333% by Cameco and 16.667% by Orano.
 
 The Cigar Lake operation is owned 54.547% by Cameco, 40.453% by Orano Canada Inc. (Orano) and 5% by TEPCO Resources Inc.
 
 Qualified Persons
 
 The technical and scientific information discussed in this document for  McArthur River/Key Lake and Cigar Lake was approved by the following  individuals who are qualified persons for the purposes of NI 43-101:  Greg Murdock, general manager, McArthur River, Cameco; Daley McIntyre,  general manager, Key Lake, Cameco; Kirk Lamont, general manager, Cigar  Lake, Cameco.
 
 Forward Looking Information
 
 This news release includes statements and information about expectations  for the future, which are referred to as forward-looking information.  This forward-looking information is based on current views, which can  change significantly, and actual results and events may be significantly  different from what is currently expected. Examples of forward-looking  information in this news release include our expectation of changes to  our 2025 production forecast as a result of delayed developments and  slower than anticipated ground freezing at the McArthur River/Key Lake  operation, and our expectation that we will be unable to fully mitigate  the expected impacts thereof; our expectation that the development  delays will defer planned extraction of uranium for 2025 at the McArthur  River/Key Lake operation to a later date; the new expected production  levels of the McArthur River/Key Lake operation for 2025; our  expectation for the 2025 production levels of the Cigar Lake mine, and  our view that its performance in 2025 may provide an opportunity to  partially offset the shortfall at the McArthur River/Key Lake operation;  our belief that our strategy positions us well to effectively mitigate  the expected production shortfall, meet our delivery commitments, and  continue to deliver long-term value,; our view that we have the option  to buy uranium in the spot market if necessary to offset the production  shortfall; our anticipated flexibility to source material through means  other than production and spot market purchases; our expectation that  any uranium not produced in 2025 will remain available to us in future  years and potentially become more valuable when delivered in the future;  our expectation that our maintained exposure to higher prices in our  long-term contracts and ongoing contract negotiations will generate  long-term value for us; our view that maintaining a strong balance sheet  will help us self-manage risk; and our view that the production  shortfall may affect the outlook regarding production and other matters  provided in our second quarter MD&A for 2025, and our intention to  provide a further update in the future.
 
 Material risks that could lead to different results include the risk  that production levels at the McArthur River/Key Lake operation could be  even lower than we currently expect for 2025 due to further development  delays, slower than anticipated ground freezing, lack of access to  adequate skilled labour, delayed commissioning of new equipment, or for  other reasons; the risk that the Cigar Lake mine will not achieve its  planned production for 2025, or that its production levels are  insufficient to partially offset the shortfall at the McArthur River/Key  Lake operation; the risk that spot market prices for uranium become  unfavourable to us in the future; the risk that we may be unable to  mitigate the expected production shortfall, meet our delivery  commitments, or continue to deliver long-term value effectively if we  are unable to source material through means other than production and  spot market purchases, or if we are unable to otherwise successfully  execute on our strategy; the risk that circumstances may arise which  delay or prevent the future production of any uranium not produced this  year, or the risk that such uranium may be less valuable when delivered  in the future; the risk that our exposure to higher prices in our  long-term contracts and ongoing contract negotiations will not generate  the expected long-term value for us; the risk that the outcome of our  contracting negotiations will not be as favourable to us as we expect;  the risk we may be unable to self-manage risk as effectively as we  expect; and the risk that these or other factors may result in further  changes to our previously provided outlook, or that we are not able to  provide a timely update regarding those changes.
 
 Cameco has made material assumptions which may prove incorrect,  including assumptions regarding the extent of the impact that the  challenges at the McArthur River/Key Lake operation will have on  production levels; assumptions regarding the magnitude of the delays and  possible further delays; the ability of the Cigar Lake mine to achieve  or exceed its expected production level; assumptions regarding the  favourability of uranium spot market purchases to us; our ability to  mitigate the expected shortfall, meet our delivery commitments and  continue to deliver long-term value by sourcing material through means  other than production and spot market purchases, and by otherwise  successfully executing on our strategy; our ability to achieve future  production of uranium not produced this year, and assumptions regarding  the effect of upstream supply pressures on future uranium pricing; our  ability to derive long-term value from our exposure to higher prices in  our long-term contracts and ongoing contract negotiations; our ability  to conclude contracting negotiations on favourable terms; assumptions  regarding future developments and trends in the uranium market; our  ability to self-manage risk; and our ability to identify and provide  updates regarding further changes to our outlook.
 
 Other material risks and assumptions associated with Cameco’s business  are described in greater detail in Cameco’s current annual information  form and its most recent annual and subsequent quarterly MD&A.  Forward-looking information is designed to help you understand  management’s current views of our near-term and longer-term prospects,  and it may not be appropriate for other purposes. Cameco will not  necessarily update this information unless required by securities laws.
 
 Profile
 
 Cameco is one of the largest global providers of the uranium fuel needed  to power a secure energy future. Our competitive position is based on  our controlling ownership of the world’s largest high-grade reserves and  low-cost operations, as well as significant investments across the  nuclear fuel cycle, including ownership interests in Westinghouse  Electric Company and Global Laser Enrichment. Utilities around the world  rely on Cameco to provide global nuclear fuel solutions for the  generation of safe, reliable, carbon-free nuclear power. Our shares  trade on the Toronto and New York stock exchanges. Our head office is in  Saskatoon, Saskatchewan, Canada.
 
 As used in this news release, the terms we, us, our, the Company and  Cameco mean Cameco Corporation and its subsidiaries unless otherwise  indicated.
 
 Contacts
 Investor inquiries
 Cory Kos
 306-716-6782
 cory_kos@cameco.com
 
 Media inquiries
 Veronica Baker
 306-385-5541
 veronica_baker@cameco.com
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