Orosur Mining Inc

Report Publication Announcement • May 28, 2013

National Storage Mechanism | Additional information

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Orosur Mining Inc. (TSX: OMI) (LSE: OMI) announces that drilling has commenced at the Company’s Anillo gold-silver prospect in northern Chile.

In line with Orosur's plans, the Company initiated on May 23th the drilling of an initial 3,000 meters of Reverse Circulation Drilling at Anillo, distributed in approximately 10 holes to test the highest priority targets for El Peñon type, high grade epithermal gold mineralization. This current drilling program is expected to be finalized by late June, with analytical data expected to become available during July-August 2013.

About Orosur Mining Inc.

Orosur Mining Inc. is a fully integrated gold producer and exploration company focused on identifying and developing gold projects in Latin America. The Company operates the only producing gold mine in Uruguay (San Gregorio), and has assembled an exploration portfolio of high quality assets in Uruguay and Chile. The Company is quoted in Canada (TSX: OMI) and London (AIM: OMI).