SASKATOON, SASKATCHEWAN--(Marketwire - Nov. 14, 2011) -

• Premium of 8.4% over Rio Tinto's offer for Hathor
• Offer set to expire at 12:01 a.m. (Vancouver time) on November 29, 2011

Cameco (TSX:CCO) (NYSE:CCJ) announced today that it has increased its all-cash offer to acquire all of the outstanding shares of Hathor Exploration Limited to $4.50 per share, which values the fully diluted share capital of Hathor at approximately $625 million.1 Cameco's increased offer will expire at 12:01 a.m. (Vancouver time) on November 29, 2011, unless further extended or withdrawn.

"Cameco's increased offer to Hathor shareholders provides an attractive premium over Rio Tinto's offer and makes sense for Cameco given our unique position in the Athabasca Basin," said Tim Gitzel, president and CEO of Cameco.

1 Estimated fully diluted share capital of approximately 139 million shares, based on Hathor's public disclosure.

How to Tender Shares to the Offer

Cameco urges Hathor shareholders to tender their shares to Cameco's increased offer before it expires at 12:01 a.m. (Vancouver time) on November 29, 2011, (unless it is extended or withdrawn) by following the instructions provided in Cameco's take-over bid circular dated August 30, 2011, which has been filed on SEDAR and is also available at cameco.com.

Hathor shareholders are encouraged to call Kingsdale Shareholder Services if they have questions or would like assistance tendering their shares to the increased offer. Shareholders can reach Kingsdale by email at [email protected], or by calling toll-free at 1-888-518-1552 (English or French). Banks and brokers can call collect at 1-416-867-2272.

Further Details of the Offer

Cameco will mail a notice of variation and extension to Hathor shareholders, which will be filed on SEDAR and available at cameco.com later today. Further details concerning the increased offer are included in the notice of variation and extension and take-over bid circular.

Advisors

CIBC World Markets Inc. is acting as financial advisor to Cameco in connection with the offer to Hathor shareholders and Osler, Hoskin & Harcourt LLP is acting as Cameco's legal counsel.

Caution Regarding Forward-Looking Information and Statements

Certain information contained in this news release constitutes "forward-looking information" (or "forward-looking statements") within the meaning of Canadian and U.S. securities laws. All statements, other than statements of historical or present fact, constitute forward-looking information and typically include words and phrases about the future such as will, anticipate, estimate, expect, plan, intend, predict, goal, target, project, potential, strategy and outlook. Forward-looking information is necessarily based upon a number of assumptions that, while considered reasonable by management, are inherently subject to significant business, economic and competitive uncertainties and contingencies. Cameco cautions the reader that such forward-looking information involves known and unknown risks, uncertainties and other factors that may cause actual results and developments to differ materially from those expressed or implied by such forward-looking information. These risks, factors and assumptions include, but are not limited to: the assumption that Cameco will acquire a 100% interest in Hathor through the Increased Offer; the risk of changes in the price of uranium; the assumption that there are no inaccuracies or material omissions in Hathor's publicly available information and the risk that Hathor has not disclosed events or facts which may have occurred or which may affect the significance or accuracy of any such information; assumptions about anticipated operations and planned exploration and development activities; the risk of operating or technical difficulties in connection with mining or development activities; and the risks involved in the exploration, development and mining business. Certain of these factors are discussed in greater detail in Cameco's and Hathor's most recent Annual Information Form and MD&A on file with the Canadian securities regulatory authorities, which we recommend that you review for more information about these assumptions and risks. The information concerning Hathor contained in this press release has been taken from or is based upon Hathor's publicly available documents on file with Canadian securities regulatory authorities. Neither Cameco nor any of its directors or officers assumes any responsibility for the accuracy or completeness of such information, or for any failure by Hathor to disclose events or facts which may have occurred or which may affect the significance or accuracy of any such information, but which are unknown to Cameco. Forward-looking information is designed to help you understand management's current views of our near and longer term prospects, and it may not be appropriate for other purposes. Cameco does not undertake any obligation to update or revise forward-looking information, whether as a result of new information, future events or otherwise, except to the extent legally required.

Profile

Cameco, with its head office in Saskatoon, Saskatchewan, is one of the world's largest uranium producers. The company's uranium products are used to generate electricity in nuclear energy plants around the world, providing one of the cleanest sources of energy available today. Cameco's shares trade on the Toronto and New York stock exchanges.

As used in this news release, "Cameco" means Cameco Corporation, a Canadian corporation and its subsidiaries and affiliates unless stated otherwise.