Osisko Intersects 141 Metres Averaging 2.4 g/t Gold at Barnat

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MONTREAL, QUEBEC--(Marketwire - Sept. 24, 2008) - Osisko Mining Corporation ("Osisko") (TSX:OSK)(FRANKFURT:EWX) is pleased to announce new results from the definition drill program currently under way at South Barnat, a separate gold mineralized zone located approximately 1200 metres northeast of the center of the Canadian Malartic deposit.  Significant results include 2.40 g/t Au over 141.5 metres (BA08-3065) and 2.76 g/t Au over 71.2 metres (BA08-3071). Higher grade intercepts include 17.57 g/t Au over 14.0 metres (BA08-3065) and 24.15 g/t Au over 4.2 metres (BA08-3066) and 15.75 g/t Au over 3.0 metres in hole BA08-3077. Results from sixteen new holes are tabled below:

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Hole No.     Section     From (m)    To (m)    Length (m)    Au g/t

BA08-3064       400E       160.0     229.5          69.5       1.64
   And                     253.5     261.0          7.50       3.62
BA08-3065       400E        60.0     201.5         141.5       2.40
 including                 163.5     177.5          14.0      17.57
BA08-3066       350E        74.0     117.0          43.0       4.55
 including                  92.8      97.0           4.2      24.15
   And                     142.0     195.0          53.0       3.65
 including                 167.0     168.5           1.5      35.20
BA08-3068       350E        35.0      57.3          22.3       0.58
BA08-3069       150E        11.9     104.8          92.9       1.29
BA08-3070       150E        18.8      71.5          52.7       1.60
BA08-3071       200E        16.3      87.5          71.2       2.76
 including                  83.5      85.0           1.5      21.00
BA08-3072       200E        12.3      80.0          67.7       1.37
BA08-3073       300E         7.9      46.1          38.2       0.65
BA08-3074       150E       100.0     152.0          52.0       1.03
BA08-3075       150E        14.2      36.5          22.3       0.75
   And                     129.6     174.7          45.1       0.84
BA08-3076       250E        99.0     119.0          20.0       1.19
   And                     188.0     225.9          37.9       2.92
 including                 213.5     215.0           1.5      40.20
BA08-3077       250E       170.0     201.2          31.2       3.50
 including                 191.0     194.0           3.0      15.75
BA08-3078       250E       145.0     194.5          49.5       1.45
BA08-3079       350E        42.0      91.0          49.0       1.06
BA08-3080       350E        69.5     102.0          32.5        .78
   And                     115.5     223.5         108.0       1.19
   And                     262.5     267.0           4.5       4.65
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The higher grade intersection in drill hole BA08-3065 (163.5 to 177.5 metres) contained a one metre sub-intersection of 375 g/t Au that was exceptionally cut to 30 g/t Au as to avoid reporting biased results in the overall intersection.

Drill holes BA08-3068, BA08-3069, BA08-3070, BA08-3072, BA08-3073 and BA08-3079 intercepted historic mine workings and did not reach the intended target depths. Assay results for BA08-3067 and further holes at South Barnat are pending.

The definition drill program is focused on an 850 metre-long grid oriented northwest-southeast with drill sections spaced 50 metres apart. All holes on this grid are inclined 45 to 75 degrees to the northeast or southwest. True widths of the mineralized intersections reported above are 40 to 70 percent of the drilled intersections.

Drilling to date suggests that the minimum strike length of the South Barnat Zone is 850 metres with a true width between 20 and 160 metres. The mineralized zone is open along strike to the southeast, where it merges with the old East Malartic Mine. It extends to depths of 250 to 400 metres in the southeastern portion, where the system is still open at depth. Estimated depth in the northwestern third of the deposit is 130 to 200 metres.

Mineralization in the South Barnat Zone 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 comprises multiple subvertical, tabular subzones hosted both in silicified greywackes of the Pontiac Group south of the fault contact and in schistose, carbonated and biotitic ultramafic rocks north of the fault contact. Porphyry dykes on both sides of the fault contain disseminated mineralization as well as late quartz veins containing visible gold. Gold mineralization in the South Barnat Zone likely extends to the east along the north and south walls of the past-producing East Malartic mine.

All NQ core assays reported above were obtained by standard 50 g fire assaying-AA finish or gravimetric finish at ALS Chemex laboratories in Val d'Or, Quebec. Reported weighted averages were calculated using a minimum of 0.50 g/t Au over successive maximum intervals of 20 metres with no upper cut-off of individual assays. Intersected drifts or lost core within mineralized intersections were incorporated as blank intervals.

Osisko Mining Corp. 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 $145 million on hand and is carrying out an aggressive definition drilling and exploration campaign. An updated NI 43-101 compliant, Measured and Indicated resource estimate on the main Canadian Malartic gold deposit was released on September 8, 2008 and will be filed on SEDAR by mid-October. This updated resource estimate did not include the South Barnat Zone nor any other mineralized zone located outside the main deposit that is currently being evaluated by Osisko.

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.

Forward Looking Statements

Certain statements contained in this press release may be deemed "forward-looking statements". All statements in this release, other than statements of historical fact, that address events or developments that the Corporation expects to occur, are forward looking statements. Forward looking statements are statements that are not historical facts and are generally, but not always, identified by the words "expects", "plans", "anticipates", "believes", "intends", "estimates", "projects", "potential", "scheduled" and similar expressions, or that events or conditions "will", "would", "may", "could" or "should" occur. Although the Corporation believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, including, without limitation that all technical, economical and financial conditions will be met in order to put the Canadian Malartic Project into commercial production, such statements are not guarantees of future performance and actual results may differ materially from those in forward looking statements. Factors that could cause the actual results to differ materially from those in forward-looking statements include gold prices, access to skilled consultants, mining development and mill production personnel, results of exploration and development activities, the Corporation's limited experience with production and development stage mining operations, uninsured risks, regulatory changes, defects in title, availability of personnel, materials and equipment, timeliness of government approvals, actual performance of facilities, equipment and processes relative to specifications and expectations, unanticipated environmental impacts on operations market prices, continued availability of capital and financing and general economic, market or business conditions. These factors are discussed in greater detail in the Corporation's most recent Annual Information Form filed on SEDAR, which also provides additional general assumptions in connection with these statements.  The Corporation cautions that the foregoing list of important factors is not exhaustive. Investors and others who base themselves on the Corporation's forward-looking statements should carefully consider the above factors as well as the uncertainties they represent and the risk they entail.  The Corporation believes that the expectations reflected in those forward-looking statements are reasonable, but no assurance can be given that these expectations will prove to be correct and such forward-looking statements included in this press release should not be unduly relied upon. These statements speak only as of the date of this press release.


Osisko Mining Corporation
John Burzynski
Vice-President Corporate Development
514-735-7131
www.osisko.com
or
Daniel Boase
Investor Relations
416-742-5600
Toll Free: 1-866-580-8891