Issue of Equity

Issue of Equity

Orosur Mining Inc.

Orosur Mining Inc.

Issue of Ordinary Shares upon Exercise of Stock Options

MONTEVIDEO, Uruguay, May 20, 2011. Orosur Mining Inc. ("OMI" or the "Company") (TSX-V: OMI) (LSE: OMI) announces that, following the exercise of options by employees, today the Company has issued a total of 21,333 Common Shares of the Company (“Common Shares”) at the following exercise prices: 18,000 Common Shares at CAD 0.60 per share and 3,333 at CAD 0.75 per share.

Application has been made for 21,333 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 26 May, 2011 in respect of those Common Shares.

On Admission, the Company will have 65,239,888 Common Shares in issue.

ENDS

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

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 Venture Exchange: OMI) and London (AIM: OMI).

For further information, please contact:

Orosur Mining Inc
David Fowler, CEO
Ignacio Salazar, CFO + 598 2601 6354; [e-mail]

Matrix Corporate Capital LLP
Robin Henshall [phone]
Tim Graham, [phone]

Blythe Weigh Communications
Tim Blythe: [phone]
Ana Ribeiro: [phone]
Matthew Neal: [phone]