Mr. John Burzynski reports
OSISKO INTERSECTS 140 G/T AU OVER 5.0 METRES AT LYNX
Osisko Mining Inc. hasprovided new results from the continuing drill program at its 100-per-cent-owned Windfall Lake gold project located in the Abitibi greenstone belt in Urban township, Eeyou Istchee James Bay, Quebec. The 800,000-metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately northeast of Windfall).
Significant new analytical results from 90 intercepts in 52 drill holes focused on infill and expansion drilling in the Lynx deposit are presented herein. Osisko continues to extend the known Lynx zones of mineralization through the application of the Windfall geological model and as the density of drilling increases:
The main Lynx corridor has been extended up plunge 250 metres southwest from the last drill intercept for a total current strike length of confirmed mineralization over 1,550 metres and remains open. Lynx HW is showing good continuity and grades towards the northeast. Lynx 4 has been extended 75 metres northeast for a total current strike length of 1,350 metres and new infill drill holes continue to demonstrate continuity and robust gold grades between sections 3650E and 4225E.
Highlights from the new results include: 140 grams per tonne gold over 5.0 metres in OSK-W-17-1343; 210 g/t Au over 2.4 metres in OSK-W-17-923; 28.3 g/t Au over 7.7 metres in OSK-W-17-1193; 83.0 g/t Au over 2.0 metres in OSK-W-17-1059; 43.1 g/t Au over 4.4 metres in OSK-W-1343-W2; 48.7 g/t Au over 2.6 metres in OSK-W-17-1104; 43.8 g/t Au over 2.5 metres in OSK-W-17-1242; 22.6 g/t Au over 4.8 metres in OSK-W-17-888; 16.0 g/t Au over 5.5 metres and 22.9 g/t Au over 2.4 metres in OSK-W-17-1177; 29.8 g/t Au over 2.2 metres in OSK-W-17-1085; 14.8 g/t Au over 4.4 metres in OSK-W-1193-W1; 27.9 g/t Au over 2.4 metres in OSK-W-17-1181-W1; and 20.6 g/t Au over 2.2 metres in OSK-17-W-945. Maps showing hole locations and full analytical results are available on the company's website.
Hole No.From To Interval Au uncutAu cut to (m)(m)(m)(g/t) 100 g/t(g/t)OSK-W-17-883 229.0231.02.0 10.3OSK-W-17-888 235.2240.04.8 22.6 21.8including236.0237.21.2 52.3 48.9including236.3 236.75 0.45109100OSK-W-17-888 248.0250.02.0 17.8including248.5249.10.6 58.1OSK-W-17-888 257.3259.42.1 4.06including257.3257.80.5 16.2OSK-W-17-902 398.0400.02.0 3.67including398.8399.20.4 16.8OSK-W-17-902 431.0433.12.1 11.7including431.0432.11.1 22.0OSK-W-17-909-W2795.8797.92.1 19.2including797.4797.90.5 61.6OSK-W-17-909-W3824.0826.02.0 5.93including824.7825.00.3 39.0OSK-W-17-909-W3836.2838.32.1 5.86OSK-W-17-923 890.1892.52.4210 44.3including890.8891.81.0498100including890.8891.30.5838100OSK-W-17-945 466.6468.82.2 20.6including466.6467.61.0 44.5OSK-W-17-945 472.8476.82.0 7.74including474.8476.01.2 16.7OSK-W-17-953 370.0372.02.0 6.02including370.8371.10.3 38.1OSK-W-17-998 261.0263.02.0 15.8including261.0262.01.0 31.5OSK-W-17-1006707.8710.02.2 13.8including707.8708.40.6 49.1OSK-W-17-1015344.1346.22.1 4.02including344.9345.50.6 13.7OSK-W-17-1015357.9360.52.6 6.26including358.8359.20.4 33.7OSK-W-17-1015400.0402.32.3 8.38including400.7401.71.0 19.0OSK-W-17-1019227.0229.02.0 11.3including227.5228.51.0 22.6OSK-W-17-1019329.0331.22.2 3.21including329.5330.00.5 13.5OSK-W-17-1019589.0591.02.0 9.04OSK-W-17-1024134.0136.02.0 3.97OSK-W-17-1024138.0140.02.0 3.64OSK-W-17-1027604.0606.02.0 3.85OSK-W-17-1027625.0627.22.2 12.2including626.0627.21.2 22.3OSK-W-17-1027779.5782.02.5 3.47OSK-W-17-1028 76.0 78.02.0 8.18including770.0 77.30.3 45.4OSK-W-17-1040162.0164.02.0 15.9including162.3162.70.4 68.3OSK-W-17-1043374.0376.02.0 3.11OSK-W-17-1044264.6266.72.1 3.59OSK-W-17-1059264.0266.02.0 83.0 55.9including264.9266.01.1149100OSK-W-17-1059362.8365.22.4 17.7including362.8364.01.2 33.6OSK-W-17-1067512.6515.73.1 4.54OSK-W-17-1072-W2 842.8845.93.1 5.24OSK-W-17-1072-W2 885.2887.22.0 17.7including886.9887.20.3 98.2OSK-W-17-1072-W2 908.0911.03.0 8.60including910.6911.00.4 56.6OSK-W-17-1072-W2 915.0917.02.0 10.9including915.5916.20.7 30.9OSK-W-17-1072-W2 989.7992.02.3 17.1including990.1990.40.3127OSK-W-17-1072-W2 1,019.71,022.02.3 4.16including1,020.21,020.50.3 31.0OSK-W-17-1072-W3 906.6909.02.4 4.02OSK-W-17-1085230.0232.52.5 4.41OSK-W-17-1085328.5330.72.2 29.8including329.5330.71.2 54.6OSK-W-17-1099 83.0 85.02.0 7.87including 83.0 83.30.3 51.9OSK-W-17-1104857.4860.02.6 48.7 27.3including857.4858.00.6193100OSK-W-17-1112603.0605.12.1 9.96including604.0604.70.7 24.0OSK-W-17-1113374.1376.22.1 6.35including374.7375.20.5 25.2OSK-W-17-1113382.4387.04.6 8.46including386.4387.00.6 22.2OSK-W-17-1128985.5988.53.0 17.4including987.0988.51.5 32.3OSK-W-17-11281,256.01,258.02.0 4.49including1,257.01,257.70.7 12.7OSK-W-17-11281,286.11,288.12.0 8.25including1,286.11,286.70.6 20.0OSK-W-17-1131135.0137.02.0 3.28including136.4137.00.6 10.8OSK-W-17-1166-W1 662.0665.03.0 3.32OSK-W-17-1166-W1 676.3682.05.7 3.13including676.3677.00.7 11.4OSK-W-17-1166-W1 799.0801.02.0 3.12OSK-W-17-1166-W2 1,048.61,050.82.2 5.06OSK-W-17-1166-W3 941.4944.02.6 4.21OSK-W-17-1166-W3 969.4971.52.1 6.63including969.4970.00.6 16.1OSK-W-17-1166-W3 1,267.01,269.12.1 6.96including1,267.51,268.20.7 16.6OSK-W-17-1166-W3 1,477.01,479.02.0 4.05including1,477.01,477.40.4 16.8OSK-W-17-1168213.0217.04.0 6.05including216.0217.01.0 14.5OSK-W-17-1169624.0627.03.0 9.75including625.5627.01.5 19.4OSK-W-17-1170232.0234.02.0 4.22OSK-W-17-1170417.0419.02.0 3.23including417.0417.50.5 12.3OSK-W-17-1177571.0576.55.5 16.0including572.2573.00.8 97.6OSK-W-17-1177764.0766.42.4 22.9including765.3766.00.7 77.0OSK-W-17-1181933.5936.02.5 4.46including 934.25935.1 0.85 12.7OSK-W-17-1181-W1 920.9923.32.4 27.9 25.6including921.5922.10.6110100OSK-W-17-1181-W1 1,030.01,032.32.3 14.4including1,031.11,031.70.6 48.2OSK-W-17-1181-W1 1,040.51,042.62.1 4.66including1,041.01,041.80.8 12.2OSK-W-17-1181-W2 909.0915.06.0 5.92OSK-W-17-1181-W2 938.0942.04.0 4.60OSK-W-17-1181-W2 949.0954.05.0 10.5including949.5950.00.5 59.5OSK-W-17-1181-W2 961.1963.22.1 41.0OSK-W-17-1181-W3 1,097.51,101.03.5 5.31OSK-W-17-1187264.0266.72.7 3.43OSK-W-17-1193971.3979.07.7 28.3 24.9including971.3974.43.1 66.5 58.1OSK-W-17-1193-W1 947.6952.04.4 14.8including947.6948.10.5 27.7including950.5951.51.0 45.5OSK-W-17-1242820.0822.52.5 3.68including821.3822.10.8 9.25OSK-W-17-1242871.0873.02.0 4.38including871.7872.20.5 15.3OSK-W-17-12421,032.01,034.52.5 43.8 12.3including1,034.21,034.50.3362100OSK-W-17-1242-W2 601.0603.02.0 7.18including602.1603.00.9 13.2including 38.4 39.20.8 21.4OSK-W-17-1320 61.8 64.32.5 4.72OSK-W-17-1320112.0114.02.0 5.45including112.4112.70.3 31.0OSK-W-17-1343541.0546.05.0140 30.8including544.7545.60.9704100OSK-W-17-1343-W2 507.3511.74.4 34.1 29.5including507.3509.11.8 77.7 66.6OSK-W-17-1343-W2 636.5639.02.5 3.11OSK-W-17-1346214.0218.14.1 3.26OSK-W-17-1350386.7388.72.0 6.31OSK-W-17-1356195.2197.52.3 10.0OSK-W-17-1364301.0307.16.1 15.0including303.8305.11.3 35.0Note: True widths are estimated at 65 per cent to 80 per cent of the reported core length interval.
OSK-W-17-883 intersected 10.3 g/t Au over 2.0 metres in Lynx 1. Mineralization is composed of 2 per cent disseminated pyrite in a silicified rhyolite with trace local visible gold and 1 per cent pyrite in a one-metre crustiform vein.
OSK-W-17-888 intersected 22.6 g/t Au over 4.8 metres, 17.8 g/t Au over 2.0 metres and 4.06 g/t Au over 2.1 metres in Lynx 2. The first and second intervals are composed of up 2 per cent disseminated pyrite with pervasive silica flooding in a fragmental felsic intrusive. The third interval corresponds to a rhyolite containing 1 per cent disseminated pyrite and 5 per centpyrite in association with pervasive silica flooding.
OSK-W-17-902 intersected 3.67 g/t Au over 2.0 metres and 11.7 g/t Au over 2.1 metres in the Lynx corridor. The first interval is composed of 2 per cent pyrite stringers and 1 per cent pyrite in tourmaline ptygmatic veins hosted in a gabbro. The second interval is composed of trace to 2 per cent stringers and disseminated pyrite in a crustiform vein hosted in the same gabbroic unit.
OSK-W-17-909-W2 intersected 19.2 g/t Au over 2.1 metres in Lynx 1. Mineralization is composed of 5per cent to 10 per cent pyrite stringers in a fuchsitized, sericitized and silicified gabbro.
OSK-W-17-909-W3 intersected Lynx 1 with 5.93 g/t Au over 2.0 metres and 5.86 g/t Au over 2.1 metres. The first interval is composed of 5 per centpyrite stringers in a crustiform vein with fuchsite and trace local visible gold hosted is a chloritized and sericitized andesite. The second interval is composed of 15 per cent pyrite clusters and stringers in a silicified and sericitized andesite.
OSK-W-17-923 intersected Lynx 4 returning 210 g/t Au over 2.4 metres with local visible gold in a slightly sericitized and silicified gabbro with fuchsite.
OSK-W-17-945 intersected Lynx 1 returning 20.6 g/t Au over 2.2 metres and 7.74 g/t Au over 4.0 metres. The first interval corresponds to a quartz vein in a sericitized zone at the contact between gabbro and rhyolite with 1 per cent disseminated and stringer pyrite. The second interval is composed of up to 5 per cent disseminated pyrite and trace pyrite stringers at the contact between a rhyolite and a sericitized gabbro.
OSK-W-17-953 intersected 6.02 g/t Au over 2.0 metres in Lynx 3. Mineralization is composed of 8 per cent pyrite with quartz clusters and veins, hosted in a slightly sericitized and silicified rhyolite with trace disseminated and stringer pyrite.
OSK-W-17-998 intersected Lynx 1 returning 15.8 g/t Au over 2.25 metres. The interval is composed of 3 per cent disseminated pyrite and 5 per cent pyrite stringers in a sericitized rhyolite.
OSK-W-17-1006 intersected 13.8 g/t Au over 2.2 metres in Lynx 4. Mineralization is composed of local visible gold, trace disseminated pyrite and 2 per cent pyrite stringers in a rhyolite with a strong pervasive silica flooding.
OSK-W-17-1015 intersected 4.02 g/t Au over 2.1 metres and 6.26 g/t Au over 2.6 metres in Lynx 2 and 8.38 g/t Au over 2.3 metres in a crustiform vein within the Lynx corridor. The first interval corresponds to a sericitized and silicified rhyolite containing trace disseminated pyrite and a decimetre-scale quartz-tourmaline vein. The second interval is composed of 4 per cent pyrite clusters and trace pyrite stringers in a strongly chloritized gabbro with weak silica and sericite alteration. The third interval corresponds with a decimetre-scale quartz-tourmaline vein in a gabbro with sericite, silica and chlorite alteration.
OSK-W-17-1019 intersected 11.3 g/t Au over 2.0 metres, 3.21 g/t Au over 2.2 metres and 9.04 g/t Au over 2.0 metres. The first interval is composed of local visible gold within a pervasive silica flooding zone with 30 per cent to 40 per cent pyrite and 5 per cent pyrite tourmaline stringers associated with a five-centimetre tourmaline ptygmatic vein. This interval is the southwest extension of the Lynx 1 corridor, 250 metres southwest of OSK-W-17-1052 (7.65 g/t Au over 4.1 metres, previously reported Oct. 30, 2017). The second interval is related to Lynx 4, geometry to be determined, and is composed of 5 per cent pyrite stringers in a sericitized and weakly silicified porphyry felsic dike. The third interval is composed of a partially dismembered quartz vein and local visible gold.
OSK-W-17-1024 intersected Lynx 1 with 3.97 g/t Au over 2.0 metres and 3.64 g/t Au over 2.0 metres. Mineralization is composed of trace disseminated pyrite in a sericitized porphyritic felsic dike.
OSK-W-17-1027 returned 3.85 g/t Au over 2.0 metres, 12.2 g/t Au over 2.2 metres and 3.47 g/t Au over 2.5 metres in the Lynx corridor. The first interval is in Lynx 2 and composed of trace disseminated pyrite in a sericitized and strongly chloritized gabbro. The second interval corresponds to a 20-centimetre-wide quartz-carbonate vein in the same gabbroic unit. The third interval is related to the Lynx HW (hangingwall)and is composed of 20 per cent pyrite stringers and 10 per cent disseminated pyrite in a bleached gabbro.
OSK-W-17-1028 intersected 8.18 g/t Au over 2.0 metres in the Lynx corridor. Mineralization is composed of up to 3 per cent pyrite clusters and 10 per cent pyrite stringers in a sericitized and silicified porphyric felsic dike. It is in the southwest extension of the Lynx 1 corridor, 145 metres southwest of OSK-W-17-1052 (7.65 g/t Au over 4.1 metres, previously reported Oct. 30, 2017). Geometry of this intercept is yet to be determined.
OSK-W-17-1040 intersected 5.9 g/t Au over 2.0 metres in Lynx 2. The interval is composed of highly silicified and fuschitized felsic intrusive with 5 per cent pyrite stringers, 2 per cent disseminated pyrite and local visible gold.
OSK-W-17-1043 intersected 3.11 g/t Au over 2.0 metres. Mineralization is composed of trace pyrite fragments and 1 per cent pyrite stringers in a chloritized and slightly silicified fragmental felsic intrusive. This interval is located between Lynx 1 and Lynx 2.
OSK-W-17-1044 intersected 3.60 g/t Au over 2.1 metres in Lynx 2. Mineralization is composed of 4 per cent disseminated and clustered pyrite in a sericitized fragmental felsic rock.
OSK-W-17-1059 intersected 83.0 g/t Au over 2.0 metres and 17.7 g/t Au over 2.4 metres in Lynx 3 and Lynx 1, respectively. Mineralization is composed of 3 per cent pyrite fragments and 1 per cent pyrite stringers in a chloritized and slightly sericitized gabbro.
OSK-W-17-1067 intersected Lynx HW returning 4.54 g/t Au over 3.1 metres. Mineralization is composed of 3 per cent pyrite stringers and 1 per cent disseminated pyrite at a chloritized and sericitized contact between an andesite and a fragmental felsic dike.
OSK-W-17-1072-W2 intersected six intervals all related to Lynx 4: 5.24 g/t Au over 3.1 metres, 17.7 g/t Au over 2.0 metres, 8.60 g/t Au over 3.0 metres, 10.9 g/t Au over 2.0 metres, 17.1 g/t Au over 2.3 metres and 4.16 g/t Au over 2.3 metres. The first interval consists of traces of ptygmatic tourmaline veins and pyrite-tourmaline stringers in a four-metre interval composed of sericitized and partially silicified rhyolite within a large gabbro. The other five intervals consist of chloritized and slightly sericitized rhyolite containing 1 per cent pyrite stringers, trace to 20 per cent tourmaline-pyrite veins and local, but intense, pervasive silica flooding.
OSK-W-17-1072-W3 intersected Lynx 4 returning 4.02 g/t Au over 2.4 metres. Mineralization is composed of trace disseminated pyrite at the sericitized contact between rhyolite and small porphyry felsic dike.
OSK-W-17-1085 intersected 4.41 g/t Au over 2.5 metres and 29.8 g/t Au over 2.2 metres in Lynx 1 and Lynx 2, respectively. The first interval is composed of trace disseminated and stringer pyrite with 2 per cent crustiform veins hosted in a chloritized and slightly silicified gabbro. The second interval consist of 5 per cent disseminated pyrite in a sericitized and strongly chloritized gabbro.
OSK-W-17-1099 intersected 7.87 g/t Au over 2.0 metres in Lynx 1. Mineralization consists of 5 per cent disseminated pyrite and 2 per cent pyrite-tourmaline stringers in a silicified and slightly sericitized rhyolite.
OSK-W-17-1104 intersected 48.7 g/t Au over 2.6 metres in the Lynx corridor. Mineralization is composed of a quartz-carbonate vein containing multiple local visible gold over 0.4 metre hosted in a fuchsitized and strongly chloritized gabbro.
OSK-W-17-1112 intersected 9.96 g/t Au over 2.1 metres in the Lynx HW. Mineralization is composed of up 3 per cent pyrite stringers and 1 per centdisseminated pyrite at a sericitized contact between a rhyolite and a chloritized-fuchsitized gabbro.
OSK-W-17-1113 intersected 6.35 g/t Au over 2.1 metres and 8.46 g/t Au over 4.6 metres. The first interval is in Lynx 2 and is composed of trace pyrite stringers and clusters in quartz veining within a sericitized and silicified rhyolite. The second interval is composed of 5 per cent pyrite clusters at a contact between a pervasively silica-flooded rhyolite and a sericitized and chloritized gabbro with trace ptygmatic tourmaline veining and located between Lynx 1 and Lynx 2.
OSK-W-17-1128 intersected 17.4 g/t Au over 3.0 metres in Lynx 4. Two additional intervals returned 4.49 g/t Au over 2.0 metres and 8.25 g/t Au over 2.0 metres in an area with geometry yet to be determined. The first interval is composed of 2 per cent pyrite stringers in a chloritized and sericitized andesite with 30 per cent smoky quartz veinlets. The second interval is composed of slightly silicified and sericitized porphyry felsic dike with trace pyrite stringers, clusters and 1 per cent quartz veining. The third interval is composed of 5 per cent pyrite in pervasive silica flooding and disseminated pyrite in a slightly sericitized rhyolite.
OSK-W-17-1131 intersected Lynx 1 with 3.28 g/t Au over 2.0 metres. Mineralization is composed of trace pyrite fragments in a sericitized fragmental felsic intrusion.
OSK-W-17-1166-W1 intersected 3.32 g/t Au over 3.0 metres, 3.13 g/t Au over 5.7 metres and 3.12 g/t Au over 2.0 metres. The first and second intervals are composed of up to 5 per cent pyrite stringer and 4 per cent fragments in a sericitized and silicified fragmental felsic intrusive with fuchsite. The second interval contains 15 per cent crustiform veins. Geometry of this intercept is yet to be determined; it is 230 metres northeast of and in the trend of Lynx 2. The third interval is in Lynx 1 and composed of 8 per cent interstitial and fragmental pyrite in a chloritized rhyolite.
OSK-W-17-1166-W2 intersected 5.06 g/t Au over 2.2 metres related to a shear zone within the Lynx corridor. Mineralization is composed of 5 per cent pyrite clusters and 1 per cent disseminated pyrite in a rhyolite with moderate silica, sericite and carbonate alteration. The mineralization is in contact with a chloritized andesite.
OSK-W-17-1166-W3 returned four intervals: 4.21 g/t Au over 2.6 metres, 6.63 g/t Au over 2.1 metres, 6.96 g/t Au over 2.1 metres and 4.05 g/t Auover 2.0 metres. The first interval in Lynx 1 is composed of dismembered crustiform veins with 3 per cent to 5 per cent disseminated pyrite hosted in gabbro with sericite, chlorite, carbonates and fuchsite alteration. The second interval is composed of 5 per cent pyrite clusters and stringers with 30 per cent quartz-tourmaline veins in a silicified rhyolite. The third interval, in Lynx 6, is composed of a strongly sericitized mafic dike with 5 per cent pyrite stringers and massive sulphides over one metre with quartz tourmaline and quartz carbonates veinlets. The fourth interval consists of 6 per cent pyrite stringers and up to 3 per cent sphalerite in a sericitized gabbro at contact with porphyric felsic dike in an area with geometry yet to be determined.
OSK-W-17-1168 intersected 6.05 g/t Au over 4.0 metres in Lynx 2. Mineralization is composed of 1 per cent pyrite stringers hosted in a sericitized and slightly silicified felsic porphyritic dike.
OSK-W-17-1169 intersected Lynx 1 returning 9.75 g/t Au over 3.0 metres. Mineralization is composed of trace disseminated pyrite in a strongly chloritized, moderately fuchsitized and carbonatized gabbro.
OSK-W-17-1170 intersected 4.22 g/t Au over 2.0 metres and 3.23 g/t au over 2.0 metres within the Lynx corridor. The first interval consists of a quartz crustiform veins with 15 per cent pyrite stringers and fuchsite alteration. The mineralization is hosted in a sericitized felsic porphyritic dike. The second interval is related to a quartz crustiform vein with traces of clustered or disseminated pyrite hosted in a hematized and sericitized felsic porphyritic dike.
OSK-W-17-1177 intersected 16.0 g/t Au over 5.5 metres and 22.9 g/t Au over 2.4 metres in Lynx 1 and Lynx 3, respectively. The first interval is composed of 1 per cent pyrite stringers and 5 per cent pyrite associated with pervasive silica flooding. The interval is hosted in a felsic porphyritic intrusion. The second interval is at the contact between a silicified and sericitized rhyolite and a gabbroic dike. Mineralization is composed of 5 per cent pyrite stringers.
OSK-W-17-1181 intersected 4.46 g/t Au over 2.5 metres in Lynx 4. Mineralization is composed of 3 per cent pyrite in quartz-tourmaline veinlets in a rhyolite with pervasive silica flooding and local sericite and fuchsite alteration. This interval extends Lynx 4 approximately 75 metres northeast of OSK-W-17-909 (11.8 g/t Au over 2.0 metres, previously reported Sept. 18, 2017, and 301 g/t Au over 6.2 metres and 10.7 g/t Au over 6.0 metres, previously reported Nov. 14, 2017).
OSK-W-17-1181-W1 intersected 27.9 g/t Au over 2.4 metres, 14.4 g/t Au over 2.3 metres and 4.66 g/t Au over 2.1 metres. The first interval corresponds to a quartz-tourmaline vein with local visible gold hosted in an altered gabbro containing fuschite and sericite. The vein is located between Lynx 1 and Lynx 4. The second interval is a small silicified porphyritic felsic dike with 15 per cent pyrite and correlates to Lynx 4. The third interval consists of 15 per cent pyrite in silicified contact between a sericite gabbro and an altered rhyolite.
OSK-W-17-1181-W2 intersected 5.92 g/t Au over 6.0 metres in Lynx 1 and 4.60 g/t Au over 4.0 metres, 10.5 g/t Au over 5.0 metres and 41.0 g/t Au over 2.1 metres in Lynx 4. The first interval is composed of 7 per cent pyrite clusters and stringers in a sericitized gabbro. The three intervals related to Lynx 4 are composed of moderately sericitized and silicified rhyolite with 2 per cent pyrite clusters and stringers. The high grade in the third interval consists of a small felsic dike with sericite and silica alteration with 5 per cent pyrite clusters and 1 per cent pyrite stringers.
OSK-W-17-1181-W3 intersected 5.31 g/t Au over 3.5 metres in Lynx 4. Mineralization is composed of 3 per cent pyrite stringers, 1 per cent pyrite tourmaline stringers, and 1 per cent tourmaline in a moderately sericitized and slightly chloritized gabbro.
OSK-W-17-1187 intersected 3.43 g/t Au over 2.7 metres in Lynx 3.Mineralization is composed of 6 per cent pyrite clusters stringers with 1 per cent tourmaline ptygmatic veins in a moderately chloritized gabbro with fuchsite.
OSK-W-17-1193 intersected 28.3 g/t Au over 7.7 metres in Lynx 4. High grade mineralization is composed of local visible gold, up 10 per cent pyrite stringers in pervasive silica flooding hosted in a breccia unit with strong fuchsite and silica alteration. This unit is at a contact of a sericitized porphyric felsic dike containing trace pyrite stringers.
OSK-W-17-1193-W1 intersected 14.8 g/t Au over 4.4 metres in the Lynx 4 corridor. High-grade mineralization is composed 7 per cent pyrite stringer and 1 per cent chalcopyrite in 20 per cent to 30 per cent crustiform veins at low angles with quartz tourmaline veins hosted in gabbro with moderate fuchsite alteration.
OSK-W-17-1242 intersected 3.68 g/t Au over 2.5 metres, 4.38 g/t Au over 2.0 metres and 43.8 g/t Au over 2.5 metres, all in Lynx 4. The first interval is composed of up to 5 per cent tourmaline-pyrite stringers hosted in a strongly sericitized gabbro with fuchsite and rhyolite fragments. The second interval is composed of 5 per cent pyrite in quartz-tourmaline veins with locally intense pervasive silica flooding hosted in a moderately sericitized rhyolite. High-grade mineralization in the third interval is composed of local trace electrum in millimetre fracture fillings and 3 per cent disseminated and stringer pyrite hosted in a strongly chloritized fragmental rhyolite.
OSK-W-17-1242-W2 intersected 7.18 g/t Au over 2.0 metres related to the Lynx HW. Mineralization is composed of 4 per cent pyrite clusters and 1 per cent pyrite in quartz veins with patches of silica flooding. The interval is hosted in a fragmental rhyolite.
OSK-W-17-1320 intersected 4.72 g/t Au over 2.5 metres and 5.45 g/t Au over 2.0 metres in the southwest extension of Lynx 1 corridor. The first interval is composed of 65 per cent crustiform vein and 5 per cent disseminated and stringer pyrite in a strongly silicified and fuchsitized andesite at the contact with porphyric felsic dike. The second interval is composed of 5 per cent disseminated pyrite, 1 per cent sphalerite clusters with intense and local pervasive silica flooding hosted in a porphyritic felsic dike with moderate carbonate and sericite alteration. It is located 90 metres southwest and up plunge of OSK-W-17-1052 (7.65 g/t Au over 4.1 metres, previously reported Oct. 30, 2017).
OSK-W-17-1343 intersected Lynx HW, returning 140 g/t Au over 5.0 metres. High-grade mineralization is composed of disseminated local visible gold in stringers filling up microfractures with electrum in a smoky quartz vein. It is hosted in a moderate sericitized and silicified rhyolite.
OSK-W-17-1343-W2 intersected 34.1 g/t Au over 4.4 metres related to Lynx HW. Mineralization is composed of local visible gold and up to 10 per centpyrite with pervasive silica flooding hosted in a moderately silicified and sericitized fragmental felsic intrusive.
OSK-W-17-1346 intersected 3.26 g/t Au over 4.1 metres in Lynx 2. Mineralization is composed of 6 per cent pyrite clusters and 2 per cent pyrite stringers at the contact between a chloritized gabbro and a silica-altered porphyritic felsic intrusion.
OSK-W-17-1350 intersected 6.31 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of 5 per cent pyrite in a sericitized rhyolite in contact with andesite. The contact contains brecciated smoky quartz veins with sericite, carbonate, tourmaline and sulphides over 1.0 metre with local visible gold.
OSK-W-17-1356 intersected 10.0 g/t Au over 2.3 metres in Lynx 1. Mineralization is composed of 5 per cent pyrite in low-core-angle ptygmatic tourmaline vein and 1 per cent disseminated pyrite at the strongly epidotized, moderately sericitized rhyolite-gabbro contact.
OSK-W-17-1364 intersected 15.0 g/t Au over 6.1 metres in the southwest extension of Lynx 1 corridor. Mineralization is at contact between a porphyric felsic dike and andesite. The porphyric felsic dike is moderately silica and sericite altered with up to 5 per cent disseminated and stringer pyrite with local and intense pervasive silica flooding and fuchsite. The andesite is moderately silicified and sericitized with 6 per cent disseminated or stringer pyrite and one-metre crustiform vein. It is located 110 metres at northeast and downplunge of OSK-W-17-1052 (7.65 g/t Au over 4.1 metres, previously reported Oct. 30, 2017).
Qualified person
The scientific and technical content of this news release has been reviewed, prepared and approved by Louis Grenier, MScA, PGeo (OGQ 800), project manager of the Windfall Lake gold project, who is a qualified person as defined by National Instrument 43-101, Standards of Disclosure for Mineral Projects.
Quality control and reporting protocols
True widths determinations are estimated at 65 per cent to 80 per cent of the reported core length intervals for most of the zones. Assays are uncut except where indicated. Intercepts occur within geological confines of major zones but have not been correlated to individual vein domains at this time. Reported intervals include minimum weighted averages of 3.0 g/t Au diluted over core lengths of at least 2.0 metres. All NQ core assays reported were obtained by either one-kilogram screen fire assay or standard 50-gram fire assaying, AA finish or gravimetric finish,at ALS Laboratories in Val d'Or, Que., Thunder Bay and Sudbury, Ont., or Vancouver, B.C., or Bureau Veritas in Timmins, Ont. The one-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multielements, including silver, using an aqua regia ICP-AES method at ALS Laboratories. Drill program design, quality assurance/quality control (QA/QC) and interpretation of results are performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the corporation as well as the lab. Approximately 5 per cent of sample pulps are sent to secondary laboratories for check assay.
About the Windfall Lake gold deposit
The Windfall Lake gold deposit is located between Val d'Or and Chibougamau in the Abitibi region of Quebec, Canada. The mineral resource defined by the previous operator comprises 2,762,000 tonnes at 8.42 g/t Au (748,000 ounces) in the indicated category and 3,512,000 tonnes at 7.62 g/t Au (860,000 ounces) in the inferred category (sourced from a technical report dated June 10, 2015, entitled "Preliminary Economic Assessment of the Windfall Lake Gold Property, Quebec, Canada," with an effective date of April 28, 2015, prepared in accordance with NI 43-101). The Windfall Lake gold deposit is currently one of the highest-grade resource-stage gold projects in Canada. The bulk of the mineralization occurs in the Main zone, a southwest/northeast-trending zone of stacked mineralized lenses, measuring approximately 600 metres wide and at least 1,400 metres long. The deposit is well defined from surface to a depth of 500 metres and remains open along strike and at depth. Mineralization has been identified only 30 metres from surface in some areas and as deep as 870 metres in others, with significant potential to extend mineralization up and down plunge and at depth.
About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration and development of precious metal resource properties in Canada. Osisko holds a 100-per-cent interest in the high-grade Windfall Lake gold deposit located between Val d'Or and Chibougamau in Quebec and holds a 100-per-cent undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100-per-cent interest in the Marban project located in the heart of Quebec's prolific Abitibi gold mining district, and properties in the Larder Lake mining division in Northeastern Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past-producing mine, and the Gold Pike mine property. The corporation also holds interests and options in a number of additional properties in Northern Quebec and Ontario. Osisko continues to be well financed with approximately $190-million in cash and investments.
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