Sierra Metals Inc.

MONTREAL, QUEBEC -- (Marketwire) -- 07/12/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company'), announces that that it has filed today on SEDAR a revised Interim Financial Report for the three-month period ended March 31, 2011. The revised Interim Financial Report include in Note 23 (d) and (e) the equity

TORONTO, ONTARIO -- (Marketwire) -- 06/30/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB)('Dia Bras' or the 'Company') is pleased to present the Company's first quarter 2011 Financial Statements and Management's Discussion & Analysis. All currency in this release is in Canadian dollars unless otherwise indicated. For a full explanation of

TORONTO, ONTARIO -- (Marketwire) -- 06/28/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that drilling at the Corralitos project on its 100% owned Batopilas Property, located in Chihuahua State, Mexico, has yielded extensive grades of molybdenum. Seventeen holes totaling 4,640.1 m have been

TORONTO, ONTARIO -- (Marketwire) -- 06/10/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to announce that it held its Annual and Special Meeting of shareholders ('AGM') yesterday, as planned. The Company received approvals by voting shareholders for all of the matters presented and discussed in the

TORONTO, ONTARIO -- (Marketwire) -- 05/27/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to announce that it has closed its previously announced acquisition of 29,377,015 voting shares ('Voting Shares') of Sociedad Minera Corona S.A. ('Corona') at a price of US$9.7282 per share for an aggregate

TORONTO, ONTARIO -- (Marketwire) -- 05/26/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to announce that it has closed its previously announced acquisition of 29,377,015 voting shares ('Voting Shares') of Sociedad Minera Corona S.A. ('Corona') at a price of US$9.7282 per share for an aggregate

TORONTO, ONTARIO -- (Marketwire) -- 05/18/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that development of El Gallo and La Narizona deposits at its 100% owned Bolivar Property in Chihuahua, Mexico, continues to advance and that the deposits will begin shipping mineralized rock to the new

TORONTO, ONTARIO -- (Marketwire) -- 05/17/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that continued drilling in support of mine planning at its 100% owned, 11,319 hectare Cusi Property silver project has returned more significant exploration results. Dia Bras has received assays of