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May 25, 2009

Mexican Silver Mines Ltd. Announces Grant of Stock Options

Mexican Silver Mines Ltd. ("Mexican Silver") (TSXV: MSM; Frankfurt WKN: A0MSLE) is pleased to announce that, subject to regulatory approval, it has granted 100,000 options (the "Options") to Fayyaz Alimohamed, the President and principal of Acamar Asia Consultants Inc., a Vancouver based company that provides investor relations activities to Mexican Silver. The Options are exercisable at a price of $0.23 per common share with an expiry date of May 21, 2010. The Options vest as to 1/4th of the Options granted every three months from the issuance date, with the first Options vesting on the date of the grant.

About Mexican Silver

Mexican Silver Mines is a silver focused junior resource company developing three former silver producing properties in northeastern Mexico. To learn more about Mexican Silver Mines, please visit: www.mexicansilvermines.com.

ON BEHALF OF THE BOARD OF
MEXICAN SILVER MINES LTD.
___________________________________
Feisal Somji, B.Sc., MBA
President and Chief Executive Officer

FOR FURTHER INFORMATION, CONTACT:

Mexican Silver Mines Ltd.
Feisal Somji, President & CEO
Phone: 403.236.5089
Fax: 403.398.0693
Email: info@mexicansilvermines.com
Web: www.mexicansilvermines.com

Investor Relations
Jamie Mathers, Ascenta Capital Partners Inc.
Phone: 604.684.4743 ext. 236
Phone: 866.684.4209
Email:jamie@ascentacapital.com

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts the responsibility for the adequacy or accuracy of this release.

Ascenta Capital Partners Inc. � Suite 1610, 1066 West Hastings Street � Vancouver � BC V6E 3X1 � Canada

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Rio Alto Mining Limited

	DEVELOPMENT STAGE
	CODE : RIO.TO
	ISIN : CA76689T1049

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Rio Alto is a copper and gold development stage company based in Canada.

Rio Alto develops copper, gold and silver in Peru, and holds various exploration projects in Mexico.

Its main asset in development is LA ARENA in Peru and its main exploration properties are ANILLO DE FUEGO, PROVIDENCIA, RAL ( LA IGUANA ), VALLECILLO, MAMULIQUE and LA BLANCA in Mexico.

Rio Alto is listed in Canada. Its market capitalisation is CA$ 793.2 millions as of today (US$ 798.5 millions, € 597.1 millions).

Its stock quote reached its lowest recent point on December 26, 2008 at CA$ 0.07, and its highest recent level on February 23, 2012 at CA$ 4.54.

Rio Alto has 175 886 000 shares outstanding.

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