Augusta Resource Corporation
TSX : AZC
AMEX : AZC
FRANKFURT : A5R

Augusta Resource Corporation

April 30, 2008 13:42 ET

Augusta to Sell 45% of Silver Production to Silver Wheaton to Raise US$165 M

VANCOUVER, BRITISH COLUMBIA--(Marketwire - April 30, 2008) - Augusta Resource Corporation (TSX:AZC)(AMEX:AZC)(FRANKFURT:A5R) ("Augusta" or the "Company") is pleased to announce it has elected to sell 45% of the payable silver to be produced during the mine life of the Company's Rosemont Copper Project ("Rosemont") to Silver Wheaton Corp. ("Silver Wheaton") for a total upfront cash payment of US$165 million. The upfront payment will be made to fund construction of the mine as milestones are achieved. Under the terms of the agreement, Augusta maintains the right to increase the saleable amount of silver, which is exercisable for up to three years from the execution of the definitive agreement.

Both parties expect to complete the definitive agreement for this transaction by the end of June 2008. The transaction is subject to (a) Augusta receiving all necessary permits to construct and operate a mine in accordance with Augusta's 2007 Rosemont Feasibility Study, (b) Augusta having entered into committed arrangements for sufficient additional financing to construct and operate the mine, and (c) execution by the parties of definitive agreements on or before June 30, 2008, as well as receipt of any required regulatory approvals and third-party consents.

ABOUT AUGUSTA RESOURCE CORPORATION - Augusta Resource Corporation is a base metals company focused on advancing the Rosemont Copper deposit located near Tucson, Arizona. Rosemont currently hosts a 7.2 billion pound copper resource that will account for 10% of US copper output once in production in 2011. The deposit also contains 180 million pounds of molybdenum and 75 million ounces of silver. A bankable feasibility study was completed in August 2007. The exceptional experience and strength of our management team, combined with the developed infrastructure and robust economics of this project, will propel Augusta to become a solid mid-tier copper producer within the next three years. The company is traded on the American Stock Exchange and the Toronto Stock Exchange under the symbol AZC, and on the Frankfurt Stock Exchange under the symbol A5R.

ON BEHALF OF THE BOARD OF DIRECTORS

Gil Clausen, President and CEO

CAUTIONARY STATEMENT REGARDING FORWARD LOOKING INFORMATION

Certain of the statements made and information contained herein and in the documents incorporated by reference may contain forward-looking statements or information within the meaning of the United States Private Securities Litigation Reform Act of 1995 and forward looking statements or information within the meaning of the Securities Act (Ontario). Forward-looking statements or information include statements regarding the expectations and beliefs of management. Forward looking statements or information include, but are not limited to, statements or information with respect to known or unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company, or industry results, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements or information.
Forward-looking statements or information are subject to a variety of risks and uncertainties which could cause actual events or results to differ from those reflected in the forward-looking statements or information, including, without limitation, risks and uncertainties relating to the Company's plans at its Rosemont Property and other mineral properties, the interpretation of drill results and the estimation of mineral resources and reserves, the geology, grade and continuity of mineral deposits, the possibility that future exploration, development or mining results will not be consistent with the Company's expectations, metal recoveries, accidents, equipment breakdowns, title matters, labor disputes or other unanticipated difficulties with or interruptions in production and operations, the potential for delays in exploration or development activities or the completion of feasibility studies, the inherent uncertainty of production and cost estimates and the potential for unexpected costs and expenses, commodity price fluctuations, currency fluctuations, failure to obtain adequate financing on a timely basis, the effect of hedging activities, including margin limits and margin calls, regulatory restrictions, including environmental regulatory restrictions and liability, the speculative nature of mineral exploration, dilution, competition, loss of key employees, and other risks and uncertainties, including those described under "Risk Factors Relating to the Company's Business" in the Company's Annual Information Form dated March 4, 2008. Should one or more of these risks and uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described in forward-looking statements. Accordingly, readers are advised not to place undue reliance on forward-looking statements or information. We do not expect to update forward-looking statements or information continually as conditions change, and you are referred to the full discussion of the Company's business contained in the Company's reports filed with the securities regulatory authorities in Canada and the United States.

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