Sierra Minerals Inc.

Sierra Minerals Inc.

July 18, 2007 16:20 ET

Sierra Reports Second Gold Theft at Cerro Colorado

TORONTO, ONTARIO--(Marketwire - July 18, 2007) - Sierra Minerals Inc. ("Sierra" or the "Company") (TSX:SIM) has today experienced a second robbery of its gold producing mine in Sonora, Mexico. The theft represented two weeks' of production. Details are not yet known subject to full police reporting and internal investigation, but it has been confirmed that all employees are safe. The Company will make a further announcement in the near future including further steps to enhance security provisions in addition to those recently implemented.

About Sierra

Sierra is a precious metals producing company focused on acquiring and developing advanced stage gold and silver deposits that have a likelihood of realizing near-term production. The Company's primary focus is Mexico, where it owns and operates the Cerro Colorado Gold mine. Sierra is committed to company-wide environmental and corporate social responsibility best practices.

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