OSK Osisko Exploration Ltee Com Npv

Osisko Exploration Ltd. (TSX VENTURE:OSK)( (FRANKFURT:EWX) is pleased to
announce that results from a drill hole collared at the northwestern limit of
the Canadian Malartic property, combined with preliminary compilation work on
the recently acquired East Amphi property, indicates potential for a new,
significant gold mineralized system in the Malartic camp, separate and distinct
from the Canadian Malartic deposit.


Drilling in the 1980's on the Western Porphyry Zone, located approximately 1300
metres northwest of the western end of the Canadian Malartic deposit, outlined a
mineralized system consisting of at least seven sets of mineralized auriferous
quartz veins hosted by porphyry dyke swarms and volcanic rocks. The mineralized
vein system is located within the Cadillac Break and was outlined over an area
measuring 200 metres by 500 metres. The veins sets, however, were too narrow and
intermittent to be of economic interest and little porphyry material was assayed
outside of the vein sets.


Richmont Mines drilled a single inclined hole (FX06-01) at the southeastern
limit of the system in 2006 and systematically assayed all drill core. This hole
intersected 128.2 metres averaging 0.63 g/t Au (from 21.5 to 149.7 metres), all
within porphyry.  The porphyry dyke swarm continues beyond the Western Porphyry
Zone in a southeastern direction for 700 metres, onto the Canadian Malartic
property where it reaches the Malartic town limits.  Osisko drilled a single
inclined hole into porphyry (CM07-1011) at the town limits, i.e. 700 metres
southeast of FX06-01, which returned 238.3 metres averaging 0.64 g/t Au (from
171.9 to 410.2 metres). In both holes, the porphyry contains few quartz veins
and is relatively homogenously mineralized with 1 to 3 percent disseminated
pyrite.


These results suggest potential for a large, low grade, porphyry-hosted gold
system similar to that of the F Zone porphyry at Canadian Malartic.  Geological
compilation suggests that the entire porphyry swarm measures approximately 1200
meters in length, is 200 to 250 metres wide on surface, and that the swarm
merges and expands into a single large intrusion that is 400 metres wide at a
depth of 200 meters.  It is worth noting that CM07-1011 stopped in
mineralization, and that there has been no historical drilling in the Western
Porphyry Zone designed or analyzed to test for a large tonnage, low grade gold
deposit.


Osisko is now designing a reconnaissance drill program in order to test the bulk
tonnage potential of the new mineralized zone. A series of holes collared along
fences spaced two hundred metres apart will be drilled in the fall of 2007.


Commenting on the new discovery, Sean Roosen, President of Osisko stated:  "We
are very encouraged with ongoing exploration results on our property package in
the Malartic camp and the potential it offers for low grade, bulk tonnage gold
resources. The Western Porphyry Zone looks very promising and should it be
mineralized throughout its 1200 metre length, we are obviously looking at
potential for another significant gold resource, above and beyond what we are
developing at the Canadian Malartic deposit. This zone offers a significant
opportunity to outline new resources for Osisko and we are looking forward to
continued exploration in this area".


In other developments, Osisko wishes to announce that The Board of Directors has
approved an increase in the stock option program to a total of 13,400,000 from
the previous maximum of 11,100,000 grantable options. The increase is to allow
the Company to recruit and retain key individuals for the development of the
Canadian Malartic Project.


The Canadian Malartic gold deposit and adjacent areas are being evaluated for a
large-scale open pit, bulk-tonnage mining operation. An updated NI 43-101
compliant, inferred gold resource estimate on the main deposit was released on
July 5, 2007 and the full report was filed on SEDAR on August 17, 2007. 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.

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