OREX: Update on Drilling Campaign at Goldboro

OSISKO MINING CORPORATION ("Osisko") and OREX EXPLORATION INC. (TSX
VENTURE:OX)(FRANKFURT:O5D) would like to provide shareholders with an update on
the exploration drilling campaign at Orex's wholly-owned Goldboro Gold Property.
As previously announced, drilling began in April 2011 on a 750-metre gap from
East Goldbrook to the east property boundary, with drill holes on three sections
spaced 250 metres apart. A total of six drill holes (OSK11-01 to OSK11-06),
representing 1,610 metres of drilling, were recently completed at East
Goldbrook.


Samples from these first six drill holes have been submitted to ALS Chemex for
assaying. As soon as the Company receives results from the lab, this information
will be communicated to shareholders.


Drilling has begun on the 600-metre long gap between West Goldbrook and Dolliver
Mountain, where three drill holes are planned spaced 200 metres apart. The
Company expects that this current phase of drilling will be completed in June
2011.


Option on Goldboro Gold Property Granted to Osisko Mining Corporation

In order to acquire a 50% undivided interest in the Goldboro Gold Property on or
before September 29, 2013 (the Initial Option), Osisko Mining Corporation shall
incur exploration and development expenditures in the amount of at least
$1,500,000 on or before September 29, 2010; in the aggregate amount of at least
$3,500,000 on or before September 29, 2011; and in the aggregate amount of at
least $8,000,000 over the following two years, that is, on or before September
29, 2013. Osisko Mining Corporation may, at its sole discretion, accelerate and
apply exploration and development expenditures to future years' expenditures
and, accordingly, the Initial Option may be exercised sooner. Osisko Mining
Corporation shall solely fund a prefeasibility study to earn an aggregate 60%
interest (that is, an additional 10% interest) in the Property on or before
September 29, 2015 (the Additional Option).


About Osisko Mining Corporation

Osisko Mining Corporation is currently moving towards commercial production at
the new Canadian Malartic gold mine in Quebec and is evaluating adjacent areas
for its large-scale open pit, bulk tonnage mining operation. The Canadian
Malartic deposit currently represents one of the biggest permitted gold reserves
in Canada, and is still growing through ongoing drilling on new mineralized
zones.


About Orex Exploration Inc.

Orex Exploration Inc. is a Canadian-based junior resource and exploration
company trading under the symbol OX on the TSX Venture Exchange and O5D on the
Frankfurt Stock Exchange. The Company holds a 100% interest in the Goldboro Gold
Project in Nova Scotia.


The technical information contained in this news release has been prepared by
Mr. Bruce Mitchell, P. Geo., Senior Project Geologist to Orex, and a Qualified
Person under National Instrument 43-101 regulations. 


Neither the 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 news release. The statements
made in this news release that are not historical facts are "forward-looking
statements" and readers are cautioned that any such statements are not
guarantees of future performance, and that actual developments or results, may
vary materially from those in these "forward-looking" statements.