Issue of Ordinary Shares upon Exercise of Stock Options

                                                                                                              News Release 

Orosur Mining Inc.

Issue of Ordinary Shares upon Exercise of Stock Options

SANTIAGO, Chile, June 6, 2012. Orosur Mining Inc. ("OMI" or the "Company") (TSX: OMI) (LSE: OMI) announces that, following the exercise of options by employees, today the Company has issued a total of 41,668 Common Shares of the Company (“Common Shares”) at CAD 0.395 per share.

Application has been made for 41,668 new Common Shares to be admitted to trading on AIM (“Admission”). It is expected that Admission will become effective and that dealings will commence on June 11, 2012 in respect of those Common Shares.

On Admission, the Company will have 78,063,143 Common Shares in issue.

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.

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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