Mr. John Burzynski reports
OSISKO INTERSECTS 41.2 G/T AU OVER 3.5 METRES AT WINDFALL
Osisko Mining Inc. has provided new results from the continuing drill program at its 100-per-cent-owned Windfall Lake gold project located in the Abitibi greenstone belt, 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 46 intercepts in 23 drill holes and five wedges focused on infill drilling in the Main Windfall lake deposit are presented in the associated table. Today's infill drilling results will not be included in the pending mineral resource scheduled for release in May, 2018.
Highlights from the new results include: 82.5 grams per tonne gold over 2.0 metres in OSK-W-17-1391; 41.2 g/t Au over 3.5 metres in OSK-W-18-1402-W3; 34.3 g/t Au over 2.6 metres in OSK-W-18-1435; 31.4 g/t Au over 2.7 metres in OSK-W-18-1440; 5.53 g/t Au over 11.9 metres in OSK-W-17-801; and 24.0 g/t Au over 2.4 metres in OSK-W-17-1409.
Hole No.From To Interval Au uncut Au cut to 100 g/t (m)(m)(m)(g/t) (g/t)OSK-EAG-12-333 787.0789.02.0 5.38including787.8788.10.3 34.7OSK-EAG-12-424 832.6835.12.5 6.72OSK-W-17-801 688.1691.02.9 7.75 697.0699.42.4 3.70 758.5770.4 11.9 5.53including758.5762.03.5 10.6 777.0781.44.4 3.92OSK-W-17-1371722.1724.62.5 3.96including724.0724.60.6 15.6OSK-W-17-1378229.9232.02.1 4.41 336.9339.42.5 5.36OSK-W-17-1379485.0487.32.3 3.03OSK-W-17-1391501.0503.02.0 82.535.6including501.0501.70.7234 100OSK-W-17-1394780.5782.62.1 4.25including781.0781.60.6 14.7OSK-W-17-1397639.0641.02.0 3.53 711.0713.22.2 3.69OSK-W-17-1399658.5661.02.5 4.45OSK-W-17-1406117.0119.02.0 7.28including117.0118.01.0 13.8 129.0131.02.0 6.91including129.4130.30.9 15.2OSK-W-17-1409133.3135.72.4 24.013.6including135.4135.70.3184 100 205.0207.02.0 6.11including205.4206.00.6 19.5 350.0352.42.4 7.17including351.0351.50.5 34.1OSK-W-18-1066-W1 944.4946.42.0 12.9including945.0945.70.7 36.0 1,008.21,010.42.2 21.0including1,008.81,009.10.3 81.6OSK-W-18-1402-W1 826.5833.16.6 4.07OSK-W-18-1402-W3 778.0780.32.3 8.11including779.2779.70.5 25.5 821.1824.63.5 6.21 880.0882.02.0 4.98including881.0881.70.7 12.3 888.5892.03.5 41.2including888.5890.01.5 65.9 1,104.71,109.44.7 9.36including1,104.71,105.10.4 35.4including1,109.11,109.40.3 96.1OSK-W-18-1423509.8512.02.2 5.63including509.8510.50.7 17.3OSK-W-18-1430707.5709.52.0 7.91including708.3708.90.6 23.1OSK-W-18-1430-W1 818.0821.03.0 4.95OSK-W-18-14311,070.01,072.02.0 5.73OSK-W-18-1431-W1 758.0760.32.3 3.06 967.8969.92.1 13.5including969.2969.90.7 28.0OSK-W-18-1434859.5864.24.7 11.6including859.5860.00.5 63.4including863.8864.20.4 45.5 960.0962.42.4 16.0including962.0962.40.4 68.7OSK-W-18-1435532.0534.62.6 34.324.7including533.3533.90.6142 100 539.0541.02.0 4.38including540.2540.50.3 29.0OSK-W-18-1440729.3732.02.7 31.426.7including730.3731.00.7118 100OSK-W-18-1441181.0187.66.6 8.06OSK-W-18-1445531.9535.43.5 5.75OSK-W-18-1446679.0682.23.2 10.8including680.2680.80.6 32.6 761.0763.02.0 4.27including761.7762.40.7 12.1 794.6796.82.2 4.05including795.2796.00.8 11.0OSK-W-18-1448263.0265.02.0 6.02OSK-W-18-1459180.0182.02.0 8.26Notes(1) True widths are estimated at 65 to 80 per cent of the reported core length interval.
OSK-EAG-12-333 intersected 5.38 g/t Au over 2.0 metres in FW3. Mineralization is composed of 7 per cent pyrite-silica flooding and up to 1 per cent pyrite stringers within a strong silica, weak sericite-altered felsic porphyritic dike.
OSK-EAG-12-424 intersected 6.72 g/t Au over 2.5 metres in FW3. Mineralization is composed of up to 5 per cent pyrite stringers, 1 per cent pyrite clusters and quartz veins within a moderate sericitized felsic porphyritic dike.
OSK-W-17-801 intersected four intervals in Caribou extension: 7.75 g/t Au over 2.9 metres, 3.70 g/t Au over 2.4 metres, 5.53 g/t Au over 11.9 metres and 3.92 g/t Au over 4.4 metres. The first and second intervals are composed of up to 5 per cent pyrite stringers and semi-massive pyrite within a strong sericite-altered andesite. In the third and fourth intervals, mineralization is composed of up to 3 per cent pyrite stringers, 3 per cent pyrite clusters and 1 per cent disseminated pyrite at the contact between a strong chlorite-altered andesite and a strong sericite-altered felsic porphyritic dike. These two intervals are 100 metres down plunge of OSK-W-17-1351 (3.65 g/t Au over 2.2 metres and 3.64 g/t Au over 2.3 metres previously reported Jan. 18, 2018).
OSK-W-17-1371 intersected 3.96 g/t Au over 2.5 metres in Wolf. Mineralization is hosted in a quartz vein and composed of up to 2 per cent disseminated pyrite within a strong chlorite-altered andesite.
OSK-W-17-1378 intersected two intervals in Caribou: 4.41 g/t Au over 2.1 metres and 5.36 g/t Au over 2.5 metres. The first interval is composed of 1 per cent pyrite stringers within strong chlorite- and weak fuchsite-altered felsic porphyritic dike. The second interval is composed of trace disseminated or stringer pyrite and quartz-tourmaline veins within a strong chlorite-altered andesite.
OSK-W-17-1379 intersected 3.03 g/t Au over 2.3 metres in Caribou extension. Mineralization is composed of trace pyrite stringer and chalcopyrite within a felsic porphyritic dike.
OSK-W-17-1391 intersected 82.5 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 1 per cent pyrite stringers and quartz vein within a chloritized andesite.
OSK-W-17-1394 intersected 4.25 g/t Au over 2.1 metres in Caribou extension. Mineralization is composed of 2 per cent pyrite stringers, 1 per cent disseminated pyrite within a strong sericite-altered rhyolite.
OSK-W-17-1397 intersected two veins in Caribou returning 3.53 g/t Au over 2.0 metres and 3.69 g/t Au over 2.2 metres. Both intersects are composed of up to 15 per cent disseminated pyrite hosted in quartz veins within a strong silica-, strong sericite- and moderate chlorite-altered rhyolite.
OSK-W-17-1399 intersected 4.45 g/t Au over 2.5 metres in Caribou extension. Mineralization is composed of 2 per cent pyrite clusters and quartz veins within a weak sericite-altered rhyolite layered with gabbro.
OSK-W-17-1406 intersected two intervals in Bobcat: 7.28 g/t Au over 2.0 metres and 6.91 g/t Au over 2.0 metres. Both intersects are composed of up to 4 per cent disseminated pyrite and quartz-tourmaline crustiform veins within a weak sericite-altered gabbro.
OSK-W-17-1409 intersected three intervals: 24.0 g/t Au over 2.4 metres and 6.11 g/t Au over 2.0 metres in Bobcat and 7.17 g/t Au over 2.4 metres in Caribou extension. The first two intervals are composed of trace disseminated and stringer pyrite and quartz-tourmaline veins within a strong sericite- and silica-altered rhyolite. The last interval is composed of trace disseminated pyrite and quartz-tourmaline veins within a strong chlorite- and weak sericite-altered rhyolite.
OSK-W-18-1066-W1 intersected two intervals: 12.9 g/t Au over 2.0 metres in FW3 and 21.0 g/t Au over 2.2 metres in FW3 footwall. The first interval is composed of 35 per cent semi-massive pyrite within a strong sericite-altered felsic porphyritic dike. The second interval is composed of 10 per cent pyrite stringers and pyrite-silica flooding within a moderate sericite-altered felsic porphyritic dike.
OSK-W-18-1402-W1 intersected 4.07 g/t Au over 6.6 metres in FW1. Mineralization is composed of up to 2 per cent pyrite in stockwork and stringers within a strong sericite-altered felsic porphyritic dike.
OSK-W-18-1402-W3 intersected five intervals: 8.11 g/t Au over 2.3 metres in FW0, 6.21 g/t Au over 3.5 metres in FW1, 4.98 g/t Au over 2.0 metres and 41.2 g/t Au over 3.5 metres in FW1 FW, and 9.36 g/t Au over 4.7 metres in FW3. The first interval is composed of up to 15 per cent pyrite in pyrite-silica flooding, stringers and disseminated within a strong sericite-altered felsic porphyritic dike. The second interval is composed of up to 3 per cent pyrite-silica flooding, 1 per cent chalcopyrite and quartz veins within a strong silica- and sericite-altered felsic porphyritic dike. The third and fourth intervals are composed of up to 20 per cent pyrite-silica flooding, up to 2 per cent chalcopyrite, 1 per cent quartz-tourmaline veins and local visible gold within strong silica and strong sericite-altered felsic porphyritic dikes. The last interval is composed of 10 per cent pyrite stringers, 2 per cent disseminated pyrite and local visible gold within a strong sericite- and strong silica-altered felsic porphyritic dike.
OSK-W-18-1423 intersected 5.63 g/t Au over 2.2 metres in Caribou extension. Mineralization is composed of 1 per cent stringer and disseminated pyrite within a strong sericite-altered andesite.
OSK-W-18-1430 intersected 7.91 g/t Au over 2.0 metres in FW1. Mineralization is composed of up to 30 per cent semi-massive pyrite in stringers or pyrite-silica flooding and 5 per cent disseminated pyrite within a moderate sericite-altered felsic porphyritic dike.
OSK-W-18-1430-W1 intersected 4.95 g/t Au over 3.0 metres in FW2. Mineralization is composed of low-core-angle quartz-tourmaline veins with 2 per cent disseminated pyrite within a felsic porphyritic dike.
OSK-W-18-1431 intersected 5.73 g/t Au over 2.0 metres in FW4. Mineralization is composed of 2 per cent pyrite stringers, 1 per cent pyrite clusters within a strong sericite-altered felsic porphyritic dike.
OSK-W-18-1431-W1 intersected two intervals: 3.06 g/t Au over 2.3 metres in FW1 and 13.5 g/t Au over 2.1 metres in FW3 FW. Both intersects are composed of up to 3 per cent pyrite stringers, 2 per cent disseminated pyrite and 1 per cent pyrite clusters within strong sericite-altered felsic porphyritic dikes.
OSK-W-18-1434 intersected two intervals: 11.6 g/t Au over 4.7 metres in FW3 and 16.0 g/t Au over 2.4 metres in FW3U. The first interval is composed of up to 15 per cent pyrite stringers, pyrite-silica flooding, and local visible gold within a strong sericite- and strong silica-altered felsic porphyritic dike. The second interval is composed of 15 per cent semi-massive pyrite, pyrite-tourmaline veins within a strong sericite-altered felsic porphyritic dike.
OSK-W-18-1435 intersected two intervals in Caribou extension: 34.3 g/t Au over 2.6 metres and 4.38 g/t Au over 2.0 metres. The first interval is composed of 80 per cent massive pyrite veins and quartz-tourmaline veins within a strong chlorite-, weak sericite- and weak carbonate-altered andesite. The second interval is composed of 15 per cent pyrite stringers within a strong carbonate-altered andesite.
OSK-W-18-1440 intersected 31.4 g/t Au over 2.7 metres in FW1. Mineralization is composed of up to 25 per cent semi-massive pyrite, 5 per cent pyrite-tourmaline veins, and local visible gold within a strong sericite- and strong silica-altered felsic porphyritic dike.
OSK-W-18-1441 intersected 8.06 g/t Au over 6.6 metres in Bobcat. Mineralization is composed of 7 per cent disseminated pyrite and 3 per cent pyrite-tourmaline stringers within a strong fuchsite- and silica-altered gabbro.
OSK-W-18-1445 intersected 5.75 g/t Au over 3.5 metres in Caribou extension. Mineralization is composed of local visible gold and up to 35 per cent pyrite in stringers, pyrite-tourmaline veins and clusters within a strong sericite- and silica-altered felsic porphyritic dike.
OSK-W-18-1446 intersected three intervals: 10.8 g/t Au over 3.2 metres in FW1, 4.27 g/t Au over 2.0 metres in FW2 and 4.05 g/t Au over 2.2 metres in FW3. The first interval is composed of up to 5 per cent disseminated pyrite and pyrite-tourmaline veins and local visible gold within a strong silica- and sericite-altered felsic porphyritic dike. The second interval is composed of 3 per cent disseminated pyrite in quartz-tourmaline veins within a moderate sericite-altered felsic porphyritic dike. The last interval is composed of local visible gold, up to 5 per cent pyrite stringers and pyrite-silica flooding within a strong silica-altered felsic porphyritic dike.
OSK-W-18-1448 intersected 6.02 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 9 per cent pyrite stringers within a moderate silica- and sericite-altered felsic porphyritic dike.
OSK-W-18-1459 intersected 8.26 g/t Au over 2.0 metres in Bobcat. Mineralization is in a crustiform vein and composed of up to 3 per cent disseminated pyrite within a strong silica and moderate fuchsite-altered gabbro.
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 width determinations are estimated at 65 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 as of Dec. 31, 2017.
We seek Safe Harbor.
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