Orosur Mining Inc. (“OMI” or the “Company”) (TSX: OMI) (AIM: OMI), the
South American-focused gold producer and explorer, announces that the
common shares of the Company will be listed and posted for trading at
the opening on Monday May 14, 2012 on the TSX under the symbol “OMI”.
The Company will be listed as an exempt issuer on the TSX and will
therefore be exempt from the reporting requirements of Section 501 of
the TSX Manual.

An application has been granted for the original listing in the Mining
category of 81,800,896 common shares, of which 77,979,809shares
are issued and outstanding and 3,821,087 shares are reserved for
issuance.

On March 29, 2000, the common shares of the Company were admitted for
listing on The Canadian Venture Exchange Inc. (“CDNX”), a predecessor to
the TSX Venture Exchange. In June 2002, the CDNX was acquired by the TSX
as a wholly owned subsidiary. Accordingly the name of the CDNX was
changed to the TSX Venture Exchange (“TSXV”), where the Company’s common
shares trade under the symbol “OMI”. On December 15, 2004, the
common shares of the Company were admitted for listing on the AIM Market
of the London Stock Exchange (“AIM”) where they trade under the symbol “OMI”.
The common shares will be delisted from TSXV on Monday May 14, 2012 upon
commencement of trading on TSX.

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.

Forward Looking Statements and Cautionary Language

This news release may contain certain information that constitutes
forward-looking statements. Forward-looking statements are frequently
characterized by words such as “plan,” “expect,” “intend,” “believe,”
“anticipate” and other similar words, or statements that certain events
or conditions “may” or “will” occur. Forward-looking statements are
based on the opinions and estimates of management at the date the
statements are made, and are subject to a variety of risks and
uncertainties and other factors that could cause actual events or
results to differ materially from those projected in the forward-looking
statements. These factors include the inherent risks involved in the
exploration and development of mineral properties and other factors
described above and in the Company’s most recent annual information form
under the heading “Risk Factors” which has been filed electronically by
means of the Canadian Securities Administrators’ website located at www.sedar.com.
The Company disclaims any obligation to update or revise any
forward-looking statements if circumstances or management’s estimates or
opinions should change. The reader is cautioned not to place undue
reliance on forward-looking statements.

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.

Contacts

Orosur Mining Inc
David Fowler
CEO
or
Ignacio
Salazar, + 56 2 9246800
CFO
info@orosur.ca
or
Canaccord
Genuity Limited (Nominated Adviser Broker)
Rob Collins /
Andrew Chubb, +44 (0) 20 7523 8000
or
Blythe Weigh
Communications (Investor Relations)
Tim Blythe, +44 (0) 7816
924626
or
Susan Mckenzie, + 44 (0) 7919 050828
or
Robert
Kellner, +44 (0) 7800 554377