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Message: OSISKO AND CLIFTON STAR REPORT 4.19 g/t Au OVER 27.5 METRES AT DUPARQUET

OSISKO AND CLIFTON STAR REPORT 4.19 g/t Au OVER 27.5 METRES AT DUPARQUET

(Montreal, June 17, 2010)

Osisko Mining Corporation (“Osisko”, OSK – TSX; EWX – Deutsche

Boerse) and Clifton Star Resources Inc (“Clifton”, CFO – TSXV; C3T – Deutsche Boerse) are pleased

to announce results from twenty-two additional holes from the 2010 drill program and extended core

sampling program at the Duparquet Project, located in the Abitibi region of Quebec. Drilling and

extended sampling on selected holes are focused on three properties: Beattie, Donchester (eastern

extension of Beattie) and Duquesne. The current Phase I drill program comprises 65,000 metres of

drilling on the Beattie property (of the overall 2010 Duparquet Project drilling campaign planned for

120,000 metres). To date approximately 52,800 metres from Phase I have been completed as 148

holes. New drilling is planned to focus on the Donchester Property. The property-wide drill program is

progressing on schedule with 10 drills currently on site. Additional results are expected to be received

and released on a regular basis as they become available from the lab.

Significant new intersections from the new drill holes listed below (from the Beattie property) include

27.5 metres averaging 4.19 g/t Au

(BD10-115), and 58.2 metres averaging 1.12 g/t Au

(BD10-138).

Assay results are summarized in the table below:

Beattie-Donchester Properties

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

(m) (uncut) (cut)

BD10-115 630500E N/60 281.5 309.0

27.5 4.16

BD10-119 631300E N/60 365.0 377.1

12.1 4.46

including 372.6 374.0

1.4 22.50

BD10-122 631300E N/60 57.6 64.0

6.4 2.25

And 436.5 457.5

21.0 0.66

BD10-123 630900E N/60 56.0 86.0

30.0 1.16

BD10-125 630000E N/60 45.0 56.3

11.3 1.70

BD10-126 630000E N/44 40.3 45.4

5.1 1.78

And 86.9 104.3

17.4 1.64

BD10-129 631300E N/60 116.0 128.5

12.5 1.31

And 340.4 348.5

8.1 0.96

BD10-130 631300E N/58 173.0 206.0

33.0 1.71

including 204.5 206.0

1.5 24.00

And 275.5 281.5

6.0 2.66

Beattie-Donchester Properties (con't)

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

(m) (uncut) (cut)

BD10-131 631300E N/60 5.5 35.0

29.5 1.19

And 117.9 136.0

18.1 2.58

including 132.9 134.3

1.4 12.85

And 397.5 431.4

33.9 0.64

BD10-134 630900E N/60 162.0 196.5

34.5 1.25

BD10-136 630600E N/60 210.4 227.0

16.6 1.80

BD10-137 630000E N/60 33.0 53.5

20.5 2.09

BD10-138 630700E N/60 317.0 375.2

58.2 1.12

Drill hole BD10-127 intersected underground mine workings and did not reach its target depth. Holes

BD10-120 and BD10-121 were skipped, and holes BD10-124, BD10-127 and BD10-128 did not

intersect significant mineralization. Results for holes BD10-132, -133 and -135 are pending.

Duquesne Property

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

DQ10-15* 642050E Nipissing 114.5 117.0

2.5 5.40

DQ10-16 642178E Nipissing 47.0 52.5

5.5 1.52

DQ10-25 642150E Nipissing 270.0 271.5

1.5 9.81

DQ10-26 642225E Nipissing 33.0 42.0

9.0 1.37

And 142.5 144.0

1.5 28.30

DQ10-27 642250E Nipissing 84.2 90.6

6.4 1.44

DQ10-28 642285E Nipissing 43.5 51.0

7.5 1.71

DQ10-29 642286E Nipissing 142.5 147.0

4.5 3.54

* Restated from previous press release.

Osisko Mining Corporation Clifton Star Resources

John Burzynski Harry Miller

Vice-President Corporate Development President

Tel. (514) 735-7131 Tel. (425) 453-0355

hmiller@cliftonstarresources.com

www.osisko.com www.cliftonstarresources.com

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