Sierra Metals Inc.

TORONTO, ONTARIO -- (Marketwire) -- 11/23/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that its own geological and mining staff has calculated a Resource Evaluation for a portion of its Cusi property, which is along Section A of the disseminated silver zone at the Promontorio mine. The Company has also completed an updated Resource Evaluation for the Bolivar

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TORONTO, ONTARIO -- (Marketwire) -- 11/15/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that exploration drilling from the surface at Promontorio mine (Figure 1: http://diabras.com/files/media/a20ec_figure1.pdf) combined with underground channel and bulk samples from drifting in the Promontorio mine continue to identify wide zones of disseminated silver

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TORONTO, ONTARIO -- (Marketwire) -- 11/11/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) is pleased to report that it has received a favorable legal ruling on its flagship Mexican property, the Bolivar property of SW Chihuahua.

TORONTO, ONTARIO -- (Marketwire) -- 11/03/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) is pleased to report that final assay results from drilling at the Corralitos project of its Batopilas property, Chihuahua State, Mexico have been received. The results confirm data from a previous release (see release of June 29, 2011) that extensive grades of molybdenum and copper occur in the drilled area. Seventeen holes

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TORONTO, ONTARIO -- (Marketwire) -- 10/26/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to announce that the road blockade impeding access between the Company's Yauricocha property and the rest of the region has been cleared. Transportation of concentrate from the property to Lima has resumed and is running as usual.

TORONTO, ONTARIO -- (Marketwire) -- 10/21/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) is pleased to report additional assay results from the stream sediment sampling program conducted at the La Verde high-sulfidation gold prospect of its Batopilas property in Chihuahua State, Mexico. These results have focused the Company's attention on certain gold-anomalous ridges that will be explored after the rainy season in

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TORONTO, ONTARIO -- (Marketwire) -- 10/21/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') reports an illegal demonstration at the Company's Yauricocha property, resulting in a road blockade halting access to trucks carrying concentrates to Lima. Additionally, a small group of demonstrators illegally entered onto the property causing minor damage.

TORONTO, ONTARIO -- (Marketwire) -- 10/06/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to announce that it has commissioned its new Piedras Verdes mill at the Bolivar Property in Chihuahua, Mexico, which currently has a capacity to process 1,000 tonnes per day ('tpd'). The mill is presently operating at 850 tpd, more than doubling the prior production of 360 tpd when using

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TORONTO, ONTARIO -- (Marketwire) -- 10/05/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to welcome and announce the appointment of Mr. Steven Dean to the Board of Directors of Dia Bras. Mr. Dean replaces Director, Mr. David Crevier, who has tendered his resignation.

TORONTO, ONTARIO -- (Marketwire) -- 09/16/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to welcome and announce the appointment of Mr. John S. Donnelly to the Board of Directors of Dia Bras. Mr. Donnelly replaces Director, Mr. Thomas Robyn, who has tendered his resignation and will remain as a consultant to the company.