Mr. John Burzynski reports
OSISKO INTERSECTS 76.5 G/T AU OVER 5.0 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 57 intercepts in 32 drill holes focused on infill and expansion drilling in the Underdog area of the Main Windfall Lake deposit are presented in the associated table. Drilling continues to infill zones of mineralization in Underdog through the application of the Windfall geological model.New mineralization has been discovered 140 metres to the southwest of previously defined Underdog zones.
Highlights from the new results include: 76.5 grams per tonne gold over 5.0 metres in OSK-W-17-1275; 29.1 g/t Au over 3.6 metres, 59.5 g/t Au over 2.1 metres, and 9.65 g/t Au over 10.4 metres in OSK-EAG-13-480; 11.9 g/t Au over 9.0 metres in OSK-W-17-1125; 24.4 g/t Au over 4.0 metres in OSK-W-17-1336; 42.9 g/t Au over 4.1 metres in OSK-W-17-13361W1; 38.7 g/t Au over 2.0 metres in OSK-W-17-1259; 22.3 g/t Au over 2.2 metres in OSK-W-17-1249; 20.4 over 2.0 metres in OSK-W-17-1239; and 13.3 g/t Au over 3.6 metres in OSK-OBM-16-693. Maps showing hole locations and full analytical results are available at the company's website.
Hole No.FromTo IntervalAu uncut Au cut to 100 g/t (m) (m)(m) (g/t) (g/t)OSK-EAG-12-399 765.5 768.02.55.57 773.9 776.02.15.21OSK-EAG-13-480 643.2 646.83.629.1including645.2 646.81.663.0 681.0 684.03.04.67including683.0 684.01.011.8 722.7 725.52.84.09 728.0 730.02.019.5including729.3 729.70.482.6 749.5 751.62.159.515.2including750.7 751.00.3 410 100 804.0 814.4 10.49.65including807.5 810.42.925.5including814.1 814.40.325.0 820.0 822.62.66.44including821.4 821.70.331.5 911.8 914.02.27.04 923.0 925.02.05.90OSK-EAG-13-505 329.0 333.84.88.37including332.0 332.80.828.8OSK-EAG-13-520 839.3 841.62.33.00OSK-OBM-16-678 599.0 601.02.03.22 604.0 606.22.23.16 619.0 621.02.07.10including620.0 621.01.012.9OSK-OBM-16-687 749.0 751.02.03.48OSK-OBM-16-693 645.4 649.03.613.3 805.0 807.02.07.36including806.0 807.01.014.2OSK-W-16-747 677.6 680.02.43.89 813.3 816.02.76.95including813.3 813.70.426.2including815.4 815.70.320.2 850.3 856.05.74.95including853.0 854.81.88.53 911.7 914.02.33.92OSK-W-17-780-W11,358.5 1,360.82.36.55including1,358.5 1,359.00.519.1 1,396.5 1,398.52.04.76OSK-W-17-866-W21,146.7 1,149.02.39.48including1,147.6 1,148.40.826.3OSK-W-17-885 1,018.0 1,020.02.06.44OSK-W-17-885-W11,065.0 1,070.05.03.18OSK-W-17-1025732.0 734.02.03.23 806.7 809.52.88.34including806.7 807.60.920.2OSK-W-17-1051-W1 941.0 943.02.03.96 1,262.0 1,264.02.010.5OSK-W-17-1125769.0 778.09.011.9including769.0 771.02.021.1including776.0 778.02.018.4 921.5 923.92.47.32including922.1 922.60.530.1OSK-W-17-1125-W3 900.8 903.02.23.85including901.1 901.40.314.0OSK-W-17-1139785.0 787.22.211.1including785.3 785.80.547.0 888.0 890.02.06.53including889.1 889.60.524.5 1,007.0 1,009.82.85.43including1,009.2 1,009.80.621.9OSK-W-17-1208440.0 442.02.03.21including441.0 442.01.06.41OSK-W-17-1239728.0 730.02.020.4 759.0 761.02.05.40including759.0 760.01.010.3OSK-W-17-1259364.0 366.02.038.7including365.0 366.01.077.1OSK-W-17-1275844.0 849.05.076.559.9including845.4 846.00.6 148 100including846.9 847.80.9 160 100OSK-W-17-1287231.9 234.02.19.63including233.1 234.00.922.4OSK-W-17-1295696.9 699.22.38.14including697.7 698.50.820.9OSK-W-17-1305722.9 725.52.614.5including722.9 723.20.351.6OSK-W-17-1305-W1 858.5 861.02.514.8including860.3 861.00.747.0OSK-W-17-1325629.2 631.32.17.57OSK-W-17-1336816.0 820.04.024.0including817.5 820.02.535.6 891.0 893.02.06.64including891.0 891.30.322.3 1,082.0 1,084.52.515.0including1,084.0 1,084.50.567.9OSK-W-17-1336-W1 992.9 995.02.142.928.8including992.9 993.50.6 150 100OSK-W-17-1353233.9 236.32.44.66including234.5 235.00.520.1OSK-W-17-1354229.3 231.42.15.05including229.6 230.00.422.9OSK-W-17-1362337.9 339.92.04.48including339.4 339.90.515.3OSK-W-17-1374504.0 508.04.04.84 526.1 530.03.93.04Notes(1) True widths are estimated at 65 to 80 per cent of the reported core length interval. See quality control.
OSK-EAG-12-399 intersected FW3U with 5.57 g/t Au over 2.5 metres and 5.21 g/t Au over 2.1 metres. Mineralization is composed of 7 per cent disseminated pyrite in a strongly sericitized andesite at the contact with a moderately sericitized felsic porphyritic dike.
OSK-EAG-13-480 intersected nine intervals: 29.1 g/t Au over 3.6 metres related to FW1, 4.67 g/t Au over 3.0 metres in FW1FW, 4.09 g/t Au over 2.8 metres, 19.5 g/t Au over 2.0 metres, 59.5 g/t Au over 2.1 metres in FW2, 9.65 g/t Au over 10.4 metres, 6.44 g/t Au over 2.6 metres in FW3 and 7.04 g/t Au over 2.2 metres, 5.90 g/t Au over 2.0 metres in FW3U. The first interval is composed of up to 7 per cent pyrite stringers, local visible gold, disseminated pyrite, chalcopyrite and sphalerite with local tourmaline ptygmatic veins hosted in a porphyriticc felsic dike. Moderate sericitization and pervasive silica flooding are present. The second interval is composed of 1 per cent pyrite stringers and traces of disseminated pyrite in a sericitized porphyritic felsic dike. The three intervals in FW2 are composed of 1 per cent pyrite stringers, 2 per cent disseminated pyrite in pervasive silica flooding, hosted in a sericitized porphyritic felsic dike with fuchsite. The sixth and seventh intervals in FW3 are composed of up to 10 per cent pyrite associated with local pervasive silica flooding within a silicified and moderately sericitized porphyritic felsic dike with fuchsite. The eighth and ninth intervals in FW3U are composed of 1 per cent pyrite stringers, 2 per cent pyrite in pervasive silica flooding within a strongly silicified and sericitized porphyritic felsic dike.
OSK-EAG-13-505 intersected 8.37 g/t Au over 4.8 metres in FW1. The mmineralization is composed of 5 per cent pyrite stringers and traces of tourmaline ptygmatic veinlets within a strongly silicified porphyritic felsic dike with moderate sericite and fuchsite alteration.
OSK-EAG-13-520 intersected 3.00 g/t Au over 2.3 metres in F3WU. Mineralization is composed of 4 per cent disseminated pyrite in a bleached andesite.
OSK-OBM-16-678 intersected 3.22 g/t Au over 2.0 metres, 3.16 g/t Au over 2.2 metres and 7.10 g/t Au over 2.0 metres in FW3U. Mineralization is composed of up to 10 per cent disseminated pyrite and 5 per cent pyrite stringers hosted in andesite or porphyritic felsic volcanic with strong sericite and weak silica alteration.
OSK-OBM-16-687 intersected 3.48 g/t au over 2.0 metres in FW3 HW. Mineralization is composed of 5 per cent pyrite stringers and 1 per cent ptygmatic tourmaline veins hosted in a fragmental felsic intrusive unit.
OSK-OBM-16-693 intersected 13.3 g/t Au over 3.6 metres and 7.36 g/t Au over 2.0 metres. The first interval is in FW3 HW and composed of trace disseminated or stringer pyrite, locally 30 per cent massive pyrite, with intense pervasive silica flooding hosted in a strongly sericitized porphyric felsic dike. The second interval is related to FW3U and composed of 12 per cent pyrite stringers and 4 per cent disseminated pyrite in a sericitized andesite.
OSK-W-16-747 intersected 3.89 g/t Au over 2.4 metres, 6.95 g/t Au over 2.7 metres, 4.95 g/t Au over 5.7 metres and 3.92 g/t Au over 2.3 metres. The first interval in FW1 and composed of 1 per cent of pyrite stringers, 1 per cent pyrite in smoky quartz veins, and 2 per cent semi-massive pyrite in sericitized and silicified porphyritic felsic dike. The second and third intervals are related to FW2 and composed of local zones with semi-massive pyrite associated with pervasive silica flooding, local visible gold and up to 2 per cent pyrite clusters hosted in a moderately sericitized felsic porphyritic dike. The fourth interval is related to FW3U and composed of 7 per cent pyrite stringers in a sericitized porphyritic felsic volcanic with tourmaline and quartz-tourmaline veinlets.
OSK-W-17-780-W1 intersected 6.55 g/t Au over 2.3 metres in FW3 HW and 4.76 g/t Au over 2.0 metres in FW3. Mineralization is composed of 2 per cent pyrite stringers in a strongly sericitized and moderately silicified porphyritic felsic dike.
OSK-W-17-866-W2 intersected FW1 returning 9.48 g/t Au over 2.3 metres. Mineralization is composed of trace disseminated or stringer pyrite hosted in a weakly sericitized and silicified porphyritic felsic dike.
OSK-W-17-885 intersected 6.44 g/t Au over 2.0 metres in FW0 HW. Mineralization is composed of 2 per cent disseminated pyrite in a weakly sericitized and silicified porphyritic felsic dike.
OSK-W-17-885-W1 intersected 3.18 g/t Au over 5.0 metres in FW0. Mineralization is composed of 3 per cent pyrite-tourmaline stringers and 1 per cent pyrite associated with pervasive silica flooding within a fragmental felsic dike.
OSK-W-17-1025 intersected FW1 returning 3.23 g/t Au over 2.0 metres and 8.34 g/t Au over 2.8 metres. The first interval is composed of 4 per cent disseminated and stringer pyrite hosted in a sericitized felsic intrusion. The second interval is composed of 6 per cent pyrite-tourmaline stringers and hosted in the same felsic intrusion.
OSK-W-17-1051-W1 intersected 3.96 g/t Au over 2.0 metres in FW3 and 10.5 g/t Au over 2.0 metres in FW1. Mineralization is composed of traces of pyrite stringers or clusters in a weakly sericitized and silicified porphyritic felsic dike.
OSK-W-17-1125 intersected 11.9 g/t Au over 9.0 metres and 7.32 g/t Au over 2.4 metres. The first interval is in FW3 HW and composed of 3 per cent pyrite stringers in a sericitized porphyritic felsic dike at the contact with a bleached mafic volcanic unit. The second interval is composed of a metre-scale crustiform vein with 25 per cent pyrite stringers hosted in a sericitized gabbro containing 15 per cent disseminated pyrite.
OSK-W-17-1125-W3 intersected 3.85 g/t Au over 2.2 metres in a crustiform vein. The mineralization is within a sericitized felsic dike with carbonate alteration and 15 per cent pyrite as clusters or in quartz-tourmaline veins.
OSK-W-17-1139 intersected three intervals: 11.1 g/t Au 2.2 metres, 6.53 g/t Au over 2.0 metres and 5.43 g/t Au over 2.8 metres. The first interval is in FW2 and composed of 1 per cent pyrite in pervasive silica flooding and 2 per cent pyrite stringers at the contact between two bleached felsic intrusive units with strong silica, sericite and fuchsite alteration. The second interval, in F3W, is a felsic porphyritic dike with moderate sericite, silica, and fuchsite alteration with 2 per cent pyrite stringers and 1 per cent pyrite in smoky quartz veins. The third interval is in FW4 and composed of 8 per cent stringers, 5 per cent disseminated pyrite, 1 per cent tourmaline-pyrite veins and crustiform veins in a moderately chloritized, strongly bleached gabbro at the contact with a felsic dike.
OSK-W-17-1208 intersected 3.21 g/t Au over 2.0 metres. The mineralization is composed of 2 per cent disseminated or clustered pyrite in a quartz vein hosted in a chloritized and strongly sericitized felsic porphyritic dike with fuchsite alteration.
OSK-W-17-1239 intersected 20.4 g/t Au over 2.0 metres and 5.4 g/t au over 2.0 metres in FW3U HW. The mineralization is composed of to up to 4 per cent pyrite stringers in a strongly sericitized and strongly silicified felsic dike.
OSK-W-17-1259 intersected FW4 zone returning 38.7 g/t Au over 2.0 metres. Mineralization is composed of 1 per cent pyrite stringers and 2 per cent semi-massive pyrite within a sericitized felsic porphyritic dike.
OSK-W-17-1275 intersected 76.5 g/t over 5.0 metres. The mineralization is composed of 10 per cent disseminated pyrite and 2 per cent pyrite stringers in a strongly silicified and sericitized andesite.
OSK-W-17-1287 intersected 9.63 g/t Au over 2.1 metres in a quartz vein. Mineralization is composed of 3 per cent disseminated chalcopyrite, and 2 per cent disseminated pyrite associated with ptygmatic quartz-tourmaline veins, hosted in a porphyritic felsic dike.
OSK-W-17-1295 intersected 8.14 g/t Au over 2.3 metres in a new zone. Mineralization is composed of up to 20 per cent semi-massive pyrite and 1 per cent disseminated chalcopyrite within a strongly sericitized and chloritized andesite. The mineralization is at the contact with a porphyritic felsic dike. This new zone is in the western area of the Underdog corridor, 140 metres southwest of OSK-W-17-1325 (7.57 g/t Au over 2.1 metres, this press release).
OSK-W-17-1305 intersected 14.5 g/t Au over 2.6 metres. The interval is related to FW3 upper zone and is composed of up to 1 per cent pyrite stringers. The mineralization is at the contact between a porphyritic felsic dike and an andesite.
OSK-W-17-1305-W1 intersected 14.8 g/t Au over 2.5 metres. The mineralization is associated with a crustiform quartz vein and composed of 6 per cent disseminated pyrite and 5 per cent pyrite stringers in a moderately silicified andesite.
OSK-W-17-1325 intersected 7.57 g/t Au over 2.1 metres. The mineralization is composed of 10 per cent pyrite stringers with trace disseminated tourmaline hosted in a bleached intermediate volcanic unit.
OSK-W-17-1336 intersected 24.0 g/t Au over 4.0 metres, 6.64 g/t Au over 2.0 metres and 15.0 g/t Au over 2.5 metres. The first interval is in FW0 and composed of 5 per cent pyrite stringers with tourmaline, 2 per cent disseminated pyrite, and 2 per cent tourmaline ptygmatic veins hosted in a moderately silicified porphyritic felsic dike. The second interval is in FW1 and composed of 5 per cent pyrite stringers and 2 per cent disseminated pyrite, hosted in silicified porphyritic felsic dike. The third interval, in FW3, is composed of 4 per cent pyrite stringers, 1 per cent disseminated pyrite within silica flooding. Local visible gold is observed in association with the pyrite stringers.
OSK-W-17-1336-W1 intersected 42.9 g/t Au over 2.1 metres in FW1. Mineralization is composed of local visible gold, up to 20 per cent pyrite clusters and up to 5 per cent disseminated pyrite in a moderately silicified and weakly sericitized felsic dike.
OSK-W-17-1353 intersected 4.66 g/t Au over 2.4 metres. Mineralization is in FW3 and is composed of 5 per cent pyrite in pervasive silica flooding with traces of pyrite-tourmaline stringers in a silicified and weakly sericitized porphyritic felsic dike.
OSK-W-17-1354 intersected 5.05 g/t Au over 2.1 metres in FW3. Ten per cent semi-massive mineralized horizons with 4 per cent pyrite stringers, 2 per cent pyrite-tourmaline stringers are hosted in a strongly sericitized fragmental felsic dike.
OSK-W-17-1362 intersected 4.48 g/t Au over 2.0 metres in FW4. Mineralization is composed of 10 per cent pyrite with tourmaline ptygmatic veins hosted in a silicified porphyritic felsic dike.
OSK-W-17-1374 intersected 4.84 g/t Au over 4.0 metres and 3.04 g/t Au over 3.9 metres. The first interval is in FW1 and composed of up 10 per cent pyrite and pyrite-tourmaline stringers in a bleached porphyritic felsic dike. The second interval is also in FW1 and composed of up to 5 per cent pyrite and pyrite-tourmaline stringers at a bleached contact between two porphyritic felsic dikes.
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.
We seek Safe Harbor.
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