Osisko and Clifton Star Intersect 70 Metres Averaging 1.94 g/t Au at Duparquet

MONTREAL, QUEBEC--(Marketwire - Nov. 2, 2010) - Osisko Mining Corporation (TSX:OSK)(FRANKFURT:EWX) and Clifton Star Resources Inc (TSX VENTURE:CFO)(FRANKFURT:C3T) are pleased to announce results from thirty-five additional holes from the 2010 drill program at the Duparquet Project, located in the Abitibi region of Quebec. Significant intersections from the new drill holes on the Beattie property include 49.3 metres averaging 2.05 g/t Au (BD10-267), 70.5 metres averaging 1.94 g/t Au and 96 metres averaging 1.21 g/t Au (separate intersections in BD10-282), 73.5 metres averaging 1.70 g/t Au (BD10-286), and 132 metres averaging 0.94 g/t Au (BD10-281). A narrower but very high grade intersection of 7.5 meters averaging 69.18 g/t Au (2.22 ounces gold per tonne) was encountered in BD10-284. Assay results are summarized in the table below:

Drill holes BD10-285, BD10-287, BD10-288, BD10-292, BD10-296, BD10-297, BD10-299, BD10-305, BD10-307 and BD10-309 did not intersect significant mineralization. These holes tested the margins to underground stopes, or alternatively surrounding basalts and sediments, all separate from the known mineralized zones. Results for holes BD10-251, BD10-261, BD10-278, BD10-290 and BD10-293 are pending.

Drilling has focused on three properties: Beattie, Donchester and Duquesne, for an overall 2010 drilling campaign of 122,800 metres that is now completed. The Phase I drill program comprised 69,800 metres of drilling on the Beattie property with a total of 219 holes. The Phase Two drilling program of 20,300 metres comprised 69 holes on the Duquesne property, and the Phase Three program of 32,700 metres on the Donchester Property and Central Duparquet comprised a total of 96 holes.

Osisko has the right to acquire a 50% interest in the Duparquet project in consideration for (1) total exploration expenditures of $70 million from 2010 to 2013, and (2) extending loans to Clifton to fund option payments on the property of $8.5 million for 24 months and $22.5 million for 36 months. These loans would carry interest at 5% and can be converted into stock at Clifton's choice. Osisko had also extended a $6 million credit line to Clifton, to be drawn prior to January 1, 2010, which was not utilized.

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 drill core weighted averages were calculated using a minimum of 0.60 g/t Au over successive maximum intervals of 20 metres with an upper cut-off of 30 g/t Au where indicated. Intersected drifts or lost core within mineralized intersections were incorporated as blank intervals. The true widths are estimated at approximately 50% to 75% of the core lengths reported above, with the exceptions of BD10-263 and BD10-264, which were fan holes drilled sub-parallel to dip of the mineralized zone.

Osisko follows strict QA-QC protocol measures in keeping with industry standards and regulatory reporting requirements. Mr. Robert Wares, P. Geo. and Executive Vice-President of Osisko, is the Qualified Person who has reviewed this news release and is responsible for the technical information reported herein, including verification of the data disclosed including the sampling, analytical and test data underlying the technical information.