Sierra Metals Inc.

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

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

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

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

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

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

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

TORONTO, ONTARIO -- (Marketwire) -- 09/14/11 -- Dia Bras Exploration Inc.(TSX VENTURE: DIB)('Dia Bras' or the 'Company') is pleased to report that exploration drilling from surface at Santa Eduwiges and Promontorio mines (Figure 1: http://www.diabras.com/files/media/76cf8_NR%20No%2030%20Vein%20map%20of%20La%20India%20to%20San%20Juan.png) has