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, September 24, 2012. Orosur Mining Inc. ("OMI" or the "Company") (TSX: OMI) (LSE: OMI) announces that, following the exercise of options, today the Company has issued a total of 55,000 Common Shares of the Company (“Common Shares”) at CAD 0.61 per share.

Application has been made for 55,000 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 September 28, 2012 in respect of those Common Shares.

On Admission, the Company will have 78,168,143 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 & Joint Broker)

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

Seymour Pierce (Joint Broker)

Stewart Dickson / Jeremy Stephenson +44 (0) 20 7107 8000

Blythe Weigh Communications (Public Relations and Investor Relations)

Tim Blythe: +44 (0) 7816 924626 Robert Kellner: +44 (0) 7800 554377 Samantha Ryan +44 (0) 7947 762658