Augusta to Commence Trading on the Toronto Stock Exchange on August 10, 2006

Augusta to Commence Trading on the Toronto Stock Exchange on August 10, 2006

Thursday, August 10th 2006

Augusta Resource Corporation is pleased to announce that its common shares have been approved for listing on the Toronto Stock Exchange (“TSX”) and will commence trading on the TSX on August 10, 2006 under the symbol “AZC”. As of the market close today, Augusta will no longer trade on the TSX Venture Exchange. The Company’s graduation to the TSX fulfils a corporate strategy to achieve greater exposure to institutional and retail investors and generate a broader shareholder base.

Gil Clausen, President and CEO, said “Augusta has clearly delivered on its operational and financing strategy over the last year, and demonstrated the value potential of our Rosemont project in Arizona. Graduating to the principal Canadian exchange is an important step in marketing our Company to a larger investor base.”

ABOUT AUGUSTA RESOURCE CORPORATION – Augusta is a mineral exploration and development company responsibly advancing copper and other base metal assets in the U.S. southwest. The Company’s Rosemont Property is located in Pima County, approximately 50 km southeast of Tucson, Arizona, and contains three known potentially open-pit copper/molybdenum (“Cu/Mo”) deposits. The Rosemont deposit contains 6.4 billion lbs of Cu equivalent (442,000,000 tons at 0.73% Cu equivalent) in measured and indicated resources and 1.9 billion lbs of Cu equivalent (145,000,000 tons at 0.67% Cu equivalent) in inferred resources. Please refer to the Company’s news release dated January 24, 2006 for further details. Augusta has additional exploration properties in Nevada, and will begin trading on the Toronto Stock Exchange under the symbol “AZC” effective August 10, 2006.


Gil Clausen, President and CEO


Certain of the statements made and information contained herein and in the documents incorporated by reference may contain “forward-looking statements” including statements concerning the Company’s plans at its Rosemont Property, and other mineral properties, which involve known and 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. Forward-looking statements 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, including, without limitation, risks and uncertainties relating to 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, 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 and other risks and uncertainties, including those described under Risk Factors Relating to the Company’s Business in the Annual Information Form and the management’s discussion and analysis. 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. Forward- looking statements include statements regarding the expectations and beliefs of management, the assumed long-term price of copper and exchange rates, the estimation of mineral reserves and resources, the realization of mineral reserve estimates in future expected production, anticipated future capital and operating costs, and the potential of the Company’s properties and expectations of growth. Except as required under applicable securities legislation, the Company undertakes no obligation to publicly update or revise forward-looking statements, whether as a result of new information, future events or otherwise.

The TSX does not accept responsibility for the adequacy or accuracy of this release.

Contacts: Augusta Resource Corporation Gil Clausen President and CEO (303) 300-0134 (303) 300-0135 (FAX)

Augusta Resource Corporation Marlo Hamer-Jackson Investor Relations Manager (604) 687-1717 (604) 687-1715 (FAX)

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