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OMI.V ·

Orosur Mining Inc. Announces New Staff Appointments at San Gregorio

Management Changes

Montevideo 13 June, 2012. Orosur Mining Inc. (‘OMI’ or ‘the Company’) (TSX: OMI) (AIM: OMI), a South American-focused gold producer and explorer, announces new appointments at the San Gregorio mine.

Orosur is pleased to announce the appointment of Mr. Juan Lacerda as General Manager for San Gregorio and Mr. Alfredo Elizondo as the new Mining Manager.

Mr. Lacerda is a Uruguayan Chemical Engineer who has worked for the Company for more than 10 years and has previously held the positions of Mill General Foreman, Mill Superintendent in San Gregorio and recently was Project Manager for the Company´s Pantanillo project in Chile, where he assisted in the completion of a positive Scoping Study (see press release on June 1st 2012). During his time as Mill Superintendent, Juan was responsible for increasing plant throughput from 1 m tonnes per annum to 1.5 m tonnes per annum through improvement in operating practices and systems with minimal capital investment. Mr. Lacerda will replace Randall Corbett who is leaving the Company.

Alfredo Elizondo is an Argentinean Mine Engineer specializing in underground and open-pit operations. Alfredo has almost 15 years of experience, has been in charge of several expansion projects and has experience in planning, development and management of operations and production. He has worked for Barrick Gold Corp. (in the Veladero project), Yamana Gold (in the Gualcamayo project) and Panamerican Silver, among others.

David Fowler, Chief Executive Officer commented:

“This is a significant strengthening of our operational team and will maintain our focus on enhancing production while controlling costs.”

ENDS

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.

For further information, please contact:

Orosur Mining Inc.

David Fowler, CEO Ignacio Salazar, CFO + 56 2 9246800;[email protected]

Canaccord Genuity Limited (Nominated Adviser & Broker)

+44 (0) 20 7523 8000 Rob Collins Andrew Chubb

Blythe Weigh Communications (Investor Relations)

Tim Blythe: +44 (0) 7816 924626 Susan Mckenzie: + 44 (0) 7919 050828 Robert Kellner: +44 (0) 7800 554377