American Stock Exchange Lists Common Stock of Northern Orion Resources, Inc. NEW YORK, April 8 /PRNewswire/ -- The American Stock Exchange(R) (Amex(R)) today listed the common stock of Northern Orion Resources, Inc. under the ticker symbol NTO. Northern Orion Resources, Inc. is a mid-tier copper and gold producer presently generating substantial cash flow from its 12.5% ownership interest in the Bajo de Alumbrera mine in Argentina. With its low operating costs and mature operation, Alumbrera should provide the necessary cash flow which, together with project debt, could bring Northern Orion's 100%-owned Agua Rica copper/gold project into production without further significant equity dilution. "We are pleased to welcome Northern Orion to the American Stock Exchange," said John McGonegal, senior vice president of the Amex Equities Group. "As a global leader in gold and mining listings, we look forward to working with Northern Orion on building increased investor attentionand visibility within the U.S. marketplace." "Northern Orion provides unhedged commodity exposure to copper and gold through our current production and assets. Our listing on the Amex will facilitate the participation of U.S. investors in our currentlow cost copper and gold production which is generating significant cash flow," commented David Cohen, President and CEO of Northern Orion. "We are pleased to offer increased additional liquidity to our current shareholders and provide access to a broader market through the Amex." The specialist in Northern Orion Resources, Inc. will be Kellogg Capital Group, LLC. For further information on NTO and other Amex-listed companies, please visit http://www.amex.com/. The American Stock Exchange(R) (Amex(R)) is the only primary exchange that offers trading across a full range of equities, options and exchange traded funds (ETFs), including structured products and HOLDRS(SM). In addition to its role as a national equities market, the Amex is the pioneer of the ETF, responsible for bringing the first domestic product to market in 1993. Leading the industry in ETF listings, the Amex lists 138 ETFs. The Amex is also one of the largest options exchanges in the U.S., trading options on broad-based and sector indexes as well as domestic and foreign stocks. For more information, please visit http://www.amex.com/. DATASOURCE: The American Stock Exchange CONTACT: Media - Lynn Duffy of the American Stock Exchange, +1-212-306-1654, Web site: http://www.amex.com/

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