MFS INTER INT NPV : Excelsior Commences Trading on OTCQX

NEWS RELEASE

Excelsior Commences Trading on OTCQX

May 24th, 2011 (TSX.V: MIN) (OTCQX: EXMGF) Excelsior Mining Corp. (TSX.V: MIN) (OTCQX: EXMGF) (“Excelsior”) is pleased to announce that it

has today commenced trading on the OTC Market’s prestigious tier, OTCQX International, under the

symbol of EXMGF. Investors can find current financial disclosure and Real-Time Level 2 quotes for

Excelsior on www.otcqx.comand www.otcmarkets.com.

About OTCQX

The OTCQX Marketplace is the premier tier of the U.S. OTC market. Investor-focused companies use the quality-controlled OTCQX platform to offer investors transparent trading, superior information, and easy access through their regulated U.S. broker-dealers. The innovative OTCQX platform offers companies and their shareholders a level of marketplace services formerly available only on a U.S. stock exchange. Several large international companies are quoted on the OTCQX including Adidas, Air France, Gazprom Neft, Repsol and Deutsche Telekom. For more information and to view a full list of OTCQX companies, visit www.otcqx.com.

About OTC Markets Group Inc.

OTC Markets Group Inc.(OTCQX: OTCM) operates the world's largest electronic marketplace for broker-dealers to trade unlisted stocks. Our OTC Link™ platform supports an open network of competing broker-dealers that provide investors with the best prices in over 10,000 OTC securities. In

2010, securities on OTC Link traded over $144 billion in dollar volume, making it the third largest U.S. equity trading venue after NASDAQ and the New York Stock Exchange. We categorize the wide

spectrum of OTC-traded companies into three tiers - OTCQX (the quality-controlled marketplace for investor friendly companies), OTCQB® (the U.S. reporting company marketplace for development stage companies), and OTC Pink™ (the speculative trading marketplace) - so investors can identify the level and quality of information companies provide. To learn more about how OTC Markets Group makes the unlisted markets more transparent, informed, and efficient, visit www.otcmarkets.com.

About Excelsior

Excelsior is an exploration and development company with a copper project located within the copper porphyry belt of Arizona. The Gunnison Copper Project is located close to the required infrastructure and with its in-situ recovery potential, is intended for near-term production. The Excelsior team consists of experienced professionals with proven track records of advancing projects towards production.

Further details about Excelsior can be found at: www.excelsiormining.com.

ON BEHALF OF THE EXCELSIOR BOARD "Stephen Twyerould"

President & CEO

T: 604-681-8030

F: 604-681-8039 www.excelsiormining.com

Renmark Financial Communications Inc.

Barry Mire: [e-mail]

Lyane Bourassa: [e-mail]

Tel.: [phone] or [phone] www.renmarkfinancial.com

Information set forth in this news release may involve forward-looking statements under applicable securities laws. Forward- looking statements are statements that relate to future, not past, events. In this context, forward-looking statements often address expected future business and financial performance, and often contain words such as "anticipate", "believe", "plan", "estimate", "expect", and "intend", statements that an action or event "may", "might", "could", "should", or "will" be taken or occur, or other similar expressions. All statements, other than statements of historical fact, included herein including, without limitation; statements about the production potential of the Gunnison Copper Project are forward-looking statements. By their nature, forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements, or other future events, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Such factors include, among others, the following risks: the need for additional financing; operational risks associated with mineral exploration; fluctuations in commodity prices; title matters; environmental liability claims and insurance; reliance on key personnel; the potential for conflicts of interest among certain officers, directors or promoters with certain other projects; the absence of dividends; competition; dilution; the volatility of our common share price and volume and the additional risks identified the management discussion and analysis section of our interim and most recent annual financial statement or other reports and filings with the TSX Venture Exchange and applicable Canadian securities regulations. Forward-looking statements are made based on management's beliefs, estimates and opinions on the date that statements are made and Excelsior undertakes no obligation to update forward-looking statements if these beliefs, estimates and opinions or other circumstances should change, except as required by applicable securities laws. Investors are cautioned against attributing undue certainty to forward-looking statements.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release, and no securities regulatory authority has either approved or disapproved of the contents of this release.