Osisko Widens Extension at South Barnat Zone

Osisko Exploration Ltd. (TSX VENTURE:OSK)(FRANKFURT:EWX) is pleased to announce
that new mineralization has been intersected in DDH CM07-2030, a scissor hole
collared 135 metres south of previously reported DDH CM07-2008, where
significant mineralization was intersected in an extension to the South Barnat
Zone (see October 23, 2007 press release). The new hole (DDH CM07-2030)
intersected 1.89 g/t Au over 111.2 metres. It was inclined 50 degrees to the
north towards DDH CM07-2008 (which was inclined 45 degrees to the south), along
the same section. The table below outlines detailed intercepts from both holes:




---------------------------------------------------------------------
Hole No.        From (m)         To (m)        Length (m)      Au g/t
---------------------------------------------------------------------
CM07-2030          56.5          167.7             111.2         1.89
---------------------------------------------------------------------
 including        129.0          132.0               3.0         6.96
---------------------------------------------------------------------
 including        163.0          167.7               4.7         7.15
---------------------------------------------------------------------
CM07-2008(i)        9.8          113.5             103.7         1.91
---------------------------------------------------------------------
 including         71.7           77.4               5.7        12.37
---------------------------------------------------------------------
(i) previously reported



These two holes define a vertical cross-section in which mineralization is
located to the north and south of the old Barnat and East Malartic mine
workings, largely along the southern edge of the Cadillac fault. The gold
mineralization is hosted both in silicified greywackes of the Pontiac Group
south of the fault contact and in schistose, carbonated ultramafic rocks and
porphyry dykes to the north of the fault contact. The mineralized section
defined by these holes occurs along the southeastern strike extension of the
South Barnat Zone (initially drill defined by Osisko in 2006 with a series of 5
holes over a strike length of 230 metres). The new drill intersections and
further compilation of historical data suggest a true mineralized width of
approximately 100 metres along this new extension, and the current minimum
strike length of the South Barnat Zone is now 600 metres.  Gold mineralization
in the South Barnat Zone remains open at depth and to the east along the north
and south walls of the past-producing East Malartic mine.


The South Barnat Zone is a separate mineralized zone located approximately 1200
metres northeast of the center of the Canadian Malartic deposit. These
significant new results have prompted Osisko management to initiate a definition
drill program along the South Barnat zone on 25 metre section spacings. 
Detailed design of the program and void modeling of the South Barnat, as well as
portion of the East Malartic mine workings, will begin immediately. The new
program is estimated to comprise a minimum of 50,000 metres of core drilling.


All NQ core assays reported above were obtained by standard 50 g fire
assaying-AA finish at ALS Chemex laboratories in Val d'Or, Quebec. Reported
weighted averages were calculated using a minimum of 0.40 g/t Au over successive
maximum intervals of 20 metres with no upper cut-off of individual assays.


Osisko Exploration Ltd. is currently evaluating the Canadian Malartic gold
deposit and adjacent areas for a large-scale open pit, bulk-tonnage mining
operation. The Company is well-funded with approximately $180 million on hand
and is carrying out an aggressive definition drilling and exploration campaign.
An updated NI 43-101 compliant, inferred gold resource estimate on the main
Canadian Malartic deposit was released on July 5, 2007 and the full report is
available on SEDAR.


Mr. Robert Wares, P. Geo. and Executive Vice-President of Osisko, is the
Qualified Person responsible for the technical information reported in this news
release.

Osisko Exploration Ltee Com Npv (TSXV:OSK)
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