Mr. John Burzynski reports
OSISKO INTERSECTS 34.3 G/T AU OVER 4.5 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 24 intercepts in 12 drill holes and five wedges focused on infill drilling in the Windfall 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: 34.3 grams per tonne gold over 4.5 metres in OSK-W-17-1172; 13.0 g/t Au over 5.7 metres in OSK-W-18-1336-W2; 27.7 g/t Au over 2.1 metres in OSK-W-17-778; and 25.5 g/t Au over 2.1 metres in OSK-W-17-1380. Maps showing hole locations and full analytical results are available at the company's website.
Hole No. From ToIntervalAu uncut Au cut to 100 g/t(m)(m) (m) (g/t) (g/t)OSK-EAG-12-427918.0920.0 2.013.0including 918.9920.0 1.123.6OSK-EAG-13-5131,050.01,054.0 4.010.6including 1,050.01,052.0 2.018.0OSK-W-16-7621,253.01,255.0 2.04.66OSK-W-17-778917.0919.2 2.211.61,095.41,098.4 3.010.61,114.61,117.1 2.59.241,132.01,134.1 2.127.719.1including 1,132.01,132.4 0.4 145 1001,158.01,160.0 2.04.49OSK-W-17-1172 136.5141.0 4.534.327.4including 136.5137.0 0.544.1including 140.0141.0 1.0 131 100OSK-W-17-1336-W1723.0725.0 2.09.44including 723.7724.0 0.362.8OSK-W-18-1336-W2831.9835.3 3.44.62849.7852.3 2.63.53950.0952.3 2.33.92964.0969.7 5.713.0including 967.3967.8 0.592.2OSK-W-17-1380 361.1363.2 2.125.525.3including 361.9362.4 0.5 101 100OSK-W-17-1394 902.7904.8 2.113.0including 904.0904.8 0.833.0OSK-W-18-1402-W1683.5686.0 2.53.57including 684.5685.0 0.517.6OSK-W-18-1418 893.0896.4 3.46.72including 893.0893.5 0.539.0OSK-W-18-1423 268.4271.0 2.63.07OSK-W-18-1431-W1922.1924.6 2.54.25OSK-W-18-1431-W2765.0767.0 2.03.55OSK-W-18-1435 555.5558.0 2.516.7including 555.5556.5 1.040.7OSK-W-18-145752.7 55.0 2.310.5including54.0 54.3 0.366.0OSK-W-18-1459 256.0258.0 2.09.52including 257.5258.0 0.536.4
OSK-EAG-12-427 intersected 13.0 g/t Au over 2.0 metres in Underdog. Mineralization contains 5 per cent pyrite stringers within an enclave of foliated andesite in a porphyric felsic dike.
OSK-EAG-13-513 intersected FW4 with 10.6 g/t Au over 4.0 metres in Underdog. Mineralization contains up to 5 per cent pyrite stringers and 3 per cent disseminated pyrite within a moderately sericitized felsic dike.
OSK-W-16-762 intersected FW4 with 4.66 g/t Au over 2.0 metres in Underdog. Mineralization contains 5 per cent semi-massive pyrite and 2 per cent pyrite stringers within a bleached andesite with moderate silica and sericite alteration.
OSK-W-17-778 intersected five intervals in Underdog: 11.6 g/t Au over 2.2 metres in FW0, 10.6 g/t Au over 3.0 metres and 9.24 g/t Au over 2.5 metres in FW1, and 27.7 g/t Au over 2.1 metres and 4.49 g/t Au over 2.0 metres in FW2. The first interval contains local visible gold with 15 per cent pyrite-silica flooding in a sericitized and bleached felsic porphyritic intrusion. The second and third intervals contain up to 5 per cent pyrite and pyrite-tourmaline stringers and up to 12 per cent disseminated and cluster pyrite with patchy silica hosted in a strongly bleached to sericitized and silicified felsic porphyritic dike. The fourth interval is similar to the previous ones and contains local visible gold.
OSK-W-17-1172 intersected 34.3 g/t Au over 4.5 metres in zone 27. Mineralization contains up 1 per cent disseminated pyrite, 5 per cent pyrite and pyrite-tourmaline stringers in a moderately silicified porphyritic felsic dike.
OSK-W-17-1336-W1 intersected 9.44 g/t Au over 2.0 metres in a vein in the Red Dog intrusive (hematized monzonite). Mineralization contains local visible gold within a centimetre-thick pyrite stringer.
OSK-W-17-1336-W2 intersected four intervals: 4.62 g/t Au over 3.4 metres and 3.53 g/t Au over 2.6 metres in FW0, 3.92 g/t Au over 2.3 metres and 13.0 g/t Au over 5.7 metres in FW1. The first interval contains local visible gold in a ptygmatic tourmaline vein hosted in a porphyritic felsic dike with up to 3 per cent pyrite-tourmaline stringers and pyrite clusters in pervasive silica flooding. The second interval contains 2 to 5 per cent semi-massive pyrite clusters, 1 to 3 per cent pyrite stringers with smoky quartz-chlorite-tourmaline, local pervasive silica flooding, ptygmatic tourmaline veinlets, 2 per cent semi-massive to massive pyrite associated with mafic fuchsitized fragments and 2 per cent disseminated pyrite, all hosted in a sericitized porphyritic felsic unit. The third interval contains up to 15 per cent pyrite-tourmaline stringers hosted in a silicified and sericitized porphyritic felsic dike. The last interval contains local visible gold with up to 20 per cent pyrite-silica flooding and 2 per cent pyrite-tourmaline stringers within a silicified and sericitized felsic dike.
OSK-W-17-1380 intersected 25.5 g/t Au over 2.1 metres in Underdog. Mineralization contains semi-massive to massive pyrite, up to 7 per cent pyrite-tourmaline and pyrite stringers and 3 per cent disseminated pyrite within a sericitized porphyritic felsic dike. It is located 50 metres west of OSK-EAG-13-505 (8.37 g/t Au over 4.8 metres, previously released Jan. 16, 2018).
OSK-W-17-1394 intersected 13.0 g/t Au over 2.1 metres in Caribou extension. Mineralization contains 1 per cent disseminated pyrite and traces of pyrite stringers within a chloritized andesite with moderate carbonate alteration.
OSK-W-18-1402-W1 intersected a mineralized vein in Red Dog intrusion returning 3.57 g/t Au over 2.5 metres. Mineralization is composed of 20-centimetre-wide quartz vein with traces of pyrite.
OSK-W-18-1418 intersected 6.72 g/t Au over 3.4 metres in Caribou. Mineralization contains up to 5 per cent pyrite and quartz-tourmaline veins at the chloritized contact between an andesite and a porphyric felsic dike.
OSK-W-18-1423 intersected 3.07 g/t Au over 2.6 metres in Bobcat. Mineralization corresponds with quartz-carbonates veins with 5 per cent pyrite in a moderately sericitized andesite with fuschite and up to 2 per cent disseminated pyrite.
OSK-W-18-1431-W1 intersected FW3 with 4.25 g/t Au over 2.5 metres in Underdog. Mineralization is composed of two decimetre-scale pyrite stringers within a sericitized and silicified porphyritic felsic dike.
OSK-W-18-1431-W2 intersected FW1 with 3.55 g/t Au over 2.0 metres in Underdog. Mineralization contains up to 5 per cent fragments of pyrite-stringers and 3 per cent disseminated pyrite in a foliated and sericitized porphyritic felsic dike with fuchsite.
OSK-W-18-1435 intersected 16.7 g/t Au over 2.5 metres related to Caribou extension. Mineralization contains 1 per cent disseminated pyrite and 3 per cent pyrite-quartz clusters within a gabbro with moderate carbonate alteration.
OSK-W-18-1457 intersected 10.5 g/t Au over 2.3 metres in Bobcat. Mineralization contains up to 4 per cent pyrite stringers associated with a tourmaline breccia hosted in a sericitized felsic porphyritic intrusion.
OSK-W-18-1459 intersected 9.52 g/t Au over 2.0 metres in Bobcat. Mineralization contains 8 per cent pyrite stringer, 3 per cent pyrite stringers and clusters, and 2 per cent pyrite in a crustiform vein in a silicified and chloritized gabbro with strong fuchsite alteration.
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.
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