Mr. Sean Roosen
OSISKO REPORTS 2.14 G/T AU OVER 107 METRES AT NEW BARNAT EXTENSION
Osisko Mining Corp. has received results from its 2010 definition drill program on the Barnat extension, located on Osisko's 100-per-cent-owned Canadian Malartic property, contiguous to the east end of the current in-pit reserves of the Canadian Malartic and Barnat deposits. The 80-hole, 18,000-metre definition drilling program, presently being executed along 25 metre-spaced sections, was started in spring 2010, following encouraging preliminary results obtained in 2009.
Results for 36 of the 80 holes of the Barnat extension program are presented below. Highlights include 107 metres averaging 2.14 grams per tonne Au (BA10-3901), 64.1 m averaging 5.03 g/t Au (BA10-3881) and 81 metres averaging 1.88 g/t Au (BA10-3886). Assay data from these holes are not included in the current resource block model, and in the majority of cases represent new mineralization and new ounces outside the current resource block model. Mineralized intersections between sections 5950E and 6150E are below or slightly within the existing engineering pit, and holes to the east of Section 6150E are outside the current engineered pit.
Hole No. Section Az./dip From (m) To (m) Length Au g/t Au g/t
(m) (uncut) (cut)
BA10-3862 5950E 182/65 163.0 199.0 36.0 1.61 ---
BA10-3863 5975E 182/57 162.0 190.0 28.0 4.46 ---
including 162.0 163.3 1.3 19.4 ---
BA10-3864 5975E 182/57 120.3 167.4 47.1 1.79 ---
BA10-3865 6000E 182/58 200.8 206.8 6.0 6.08 ---
BA10-3866 6000E 182/57 51.0 62.8 11.8 3.04 ---
And 131.4 195.0 63.6 1.85 ---
including 137.5 138.3 0.8 15.55 ---
BA10-3867 6000E 182/64 142.1 157.7 15.6 7.02 6.79
including 150.0 151.4 1.4 32.50 30.00
BA10-3869 6025E 182/64 93.2 107.2 14.0 3.19 ---
And 141.8 152.2 10.4 2.21 ---
And 181.3 211.0 29.7 2.40 ---
BA10-3870 6050E 182/59 92.3 118.0 25.7 3.15 ---
And 178.0 190.0 12.0 2.88 ---
BA10-3871 6050E 182/48 31.5 56.5 25.0 1.37 ---
And 104.0 146.0 42.0 1.58 ---
BA10-3872 6050E 182/59 39.0 65.5 26.5 3.21 ---
including 48.9 51.5 2.6 19.83 ---
And 103.7 159.0 55.3 1.67 ---
including 124.5 125.5 1.0 21.10 ---
BA10-3873 5925E 189/56 139.7 163.0 23.3 1.13 ---
BA10-3874 5925E 189/71 136.0 148.2 12.2 2.35 ---
And 178.3 182.6 4.3 22.34 16.05
And 218.0 230.0 12.0 1.78 ---
BA10-3875 5975E 182/45 33.0 57.0 24.0 2.50 ---
BA10-3876 6000E 180/45 38.0 60.5 22.5 2.73 ---
And 86.0 102.5 16.5 1.31 ---
BA10-3877A 6000E 180/60 48.0 128.7 80.7 1.15 ---
BA10-3878 6050E 2/45 127.5 158.7 31.2 6.30 5.28
including 137.0 139.7 2.7 24.23 20.59
including 153.6 157.0 3.4 19.74 13.36
BA10-3879 6075E 2/45 31.5 84.5 53.0 1.41 ---
And 133.6 160.3 26.7 4.32 4.22
including 142.9 148.7 5.8 12.78 12.32
BA10-3880 6125E 2/45 46.5 93.0 46.5 2.35 ---
including 69.0 70.0 1.0 16.90 ---
BA10-3881 6075E 182/60 77.1 141.2 64.1 5.03 ---
including 100.5 121.6 21.1 11.79 ---
And 168.3 237.0 68.7 1.00 ---
BA10-3882 6075E 182/66 123.5 140.4 16.9 5.58 ---
including 123.5 124.7 1.2 13.95 ---
And 203.0 270.6 67.6 1.84 ---
including 211.6 216.2 4.6 11.96 ---
BA10-3883 6025E 178/45 46.8 91.5 44.7 1.25 ---
BA10-3884 6025E 182/51 74.7 121.2 46.5 1.62 ---
BA10-3885 6025E 182/67 101.3 159.0 57.7 0.93 ---
BA10-3886 6175E 2/45 27.0 108.0 81.0 1.88 1.68
including 81.6 82.4 0.8 21.80 ---
including 105.0 105.8 0.8 50.40 30.00
And 130.1 133.5 3.4 11.63 ---
BA10-3887 6200E 2/53 73.0 82.0 9.0 2.71 ---
And 106.5 153.5 47.0 1.00 ---
BA10-3888 6175E 2/49 112.5 163.5 51.0 2.61 2.54
including 139.5 141.0 1.5 32.50 30.00
And 194.0 213.0 19.0 1.48 ---
BA10-3889 6150E 2/50 99.0 175.0 76.0 1.87 ---
BA10-3890 6125E 2/46 84.0 139.3 55.3 2.18 ---
BA10-3891 6125E 2/46 85.5 199.5 114.0 0.97 ---
And 225.0 285.0 60.0 0.60 ---
And 312.0 316.8 4.8 3.72 ---
BA10-3892 6075E 182/49 18.7 47.2 28.5 1.86 ---
And 104.0 165.6 61.6 1.16 ---
BA10-3894 6100E 182/46 27.4 51.5 24.1 1.42 ---
And 108.8 151.5 42.7 1.20 ---
BA10-3895 6100E 182/58 39.0 58.8 19.8 5.05 3.58
including 39.0 40.5 1.5 49.50 30.00
And 126.0 190.4 64.3 1.42 ---
BA10-3897 6075E 2/53 88.0 187.5 99.5 1.26 ---
including 184.2 185.1 0.9 14.65 ---
BA10-3899 6125E 182/45 122.7 226.0 103.3 1.15 ---
BA10-3900 6125E 182/57 145.0 226.5 81.5 1.71 ---
BA10-3901 6150E 165/61 129.5 236.5 107.0 2.14 ---
including 189.5 190.5 1.0 17.45 ---
Results for holes BA10-3868, BA10-3893, BA10-3896, BA10-3898 and holes BA10-3902 to BA10-3926 are pending. The next series of holes that are currently being drilled for this program are BA10-3954 to BA10-3972.
The drill data suggest the Barnat rxtension comprises two mineralized zones that parallel to the southern limit of the Cadillac fault. The northerly extension (Sheehan zone) is located within the Cadillac fault and is hosted mostly by mineralized porphyry within sheared and altered ultramafic rocks. This zone is subvertical and 12 metres true thickness on average (range of two to 28 metres). The southerly extension (Mammoth zone) is located in Pontiac sediments, about 35 metres south of the Sheehan zone. This zone comprises silicified porphyry and metasediments similar to those of the Canadian Malartic deposit. This zone dips subvertically to the north near surface and reverses to a 75-degree dip to the south at depth. Its average true thickness is 25 metres, although drill hole BA10-3901 has outlined previously unknown and more extensive mineralization towards the south, suggesting a minimum thickness in that sector of 60 metres. Both zones have been traced along a strike length of 200 metres in the immediate area of the old East Malartic mine workings, and both zones are open to the east and at depth.
Sean Roosen, president and chief executive officer of Osisko, commented: "The positive results from the new Barnat Extension drilling, in addition to what Osisko and Golden Valley Mines have already reported from the Jeffrey zone located one kilometre further to the east, suggest there is excellent potential to discover new, higher-grade ore on the Canadian Malartic project. These two deposits will almost certainly provide future feed and thereby extend the life of the milling complex."
All NQ core assays reported above were obtained by standard 50-gram fire assaying-AA finish or gravimetric finish at ALS Chemex laboratories in Val d'Or, Que. Reported drill core weighted averages were calculated using a minimum of 0.34 g/t Au over successive intervals of 20 metres. The reported lengths of isolated mineralized intervals were minimized, and an upper cut-off of 30 g/t Au was applied to individual assays where indicated. Intersected drifts or lost core within mineralized intersections were incorporated as blank intervals.
Osisko follows strict quality assurance and quality control protocol measures in keeping with industry standards and regulatory reporting requirements. Robert Wares, PGeo and executive vice-president of Osisko, and Francois Bouchard, PGeo, are the qualified persons who has reviewed this news release and are responsible for the technical information reported herein, including verification of the data disclosed including the sampling, analytical and test data underlying the technical information.
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