Sierra Metals Inc.

TORONTO, ONTARIO -- (Marketwire) -- 01/21/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) is pleased to report that surface sampling of the San Patricio prospect on its wholly owned Bacerac Property has identified high grades of silver and gold. The sampling program underway resulted from Management's decision late in 2010 to accelerate

TORONTO, ONTARIO -- (Marketwire) -- 01/12/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that all of its outstanding 10,006,493 warrants with an exercise price of $0.70 and an expiry date of January 10, 2011, were exercised, bringing an additional $7,004,545 of proceeds to the Company. These

TORONTO, ONTARIO -- (Marketwire) -- 12/31/10 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that drilling continues at its La Cascada target, which is a high-sulphidation gold system at its wholly owned Bolivar Property in southwestern Chihuahua State, Mexico. Drilling is targeted on

TORONTO, ONTARIO -- (Marketwire) -- 12/29/10 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report assay results from the La Verde high-sulfidation gold prospect at its wholly owned Batopilas Property in Chihuahua State, Mexico. The Batopilas Property is located southeast of the Company's wholly owned

MONTREAL, QUEBEC -- (Marketwire) -- 12/21/10 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras') (the 'Company') is pleased to report that it has initiated development of the La Narizona mine at its wholly owned Bolivar Property after recent drilling confirmed the continuity of high-grade zinc-copper mineralization in this area. This

MONTREAL, QUEBEC -- (Marketwire) -- 12/08/10 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras') (the 'Company') announces that the previously announced consolidation of its common shares became effective today, December 8, 2010. Following the consolidation, the number of common shares issued and outstanding was reduced from 517,563,844

MONTREAL, QUEBEC -- (Marketwire) -- 11/30/10 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras') (the Company) announces the results for the three- and nine- month periods ended September 30, 2010. All currency in this release is in Canadian dollars unless otherwise indicated. For a full explanation of results, the unaudited Interim

MONTREAL, QUEBEC -- (Marketwire) -- 11/02/10 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) (the 'Company') is pleased to report that construction of its new Piedras Verdes Mill at the Bolivar Property in Chihuahua, Mexico, is progressing on time and on budget for commissioning early in the second quarter of 2011. Of particular note is that due