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Osisko Windfall Results From Discovery 1 Deep Drill Hole

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Osisko Windfall Results From Discovery 1 Deep Drill Hole






Osisko Mining Inc. (TSX:OSK) is pleased to provide an update on the Discovery 1 (OSK-W-19-1970) drill hole. Discovery 1 is a 3467 metre drill hole, the longest diamond drill hole in Canada, which successfully intersected the targeted down plunge extensions of two known gold zones and investigated the projected source area of the Windfall deposit at depth.


Prior results from Discovery 1 include the successful intersection of the targeted Underdog Zone (500 metre extension:  14.1 g/t Au over 2.1 metres) and Triple 8 Zone (100 metres extension:  9.58 g/t Au over 7.6 metres) (see Osisko news release dated September 11, 2019). Discovery 1 also intersected wide anomalous gold zones including 116 metres of 0.46 g/t Au (see Osisko news release dated December 10, 2019). Similar wide anomalous gold zones have been observed in the proximity of Triple 8, Triple Lynx, and Lynx zones.


Previously reported intersection 1.05 g/t Au over 96.0 metres (see Osisko news release dated January 29, 2020) has been extended by new analytical results to 1.04 g/t Au over 191 metres, including a high-grade intersection of 10.1 g/t Au over 2.5 metres. The intersection begins at 3139 metres down hole and now ends at 3330 metres. All analytical results for Discovery 1 have been received. Mineralization, up to 3% pyrite and pyrrhotite, occurs in biotite, chlorite, and sericite altered mafic volcanics with occasional felsic volcanics and local felsic porphyritic intrusions. The high value intercept is within a breccia textured interval with an increased intensity of carbonate alteration in fracture filling.


Osisko President and Chief Executive Officer John Burzynski commented: “Discovery 1 has been a great success for Osisko. We are very pleased to have intersected the down plunge extensions of known zones, especially Underdog. This 500 metre extension provides us with a high potential zone ready for infill drilling to continue to grow our world class deposit. The wide zones of anomalous gold interspersed with high-grade intervals throughout the bottom half of the hole are a strong indication the Windfall gold system is extensive. We are planning a down hole IP geophysical survey to further investigate the potential for new Lynx-like zones nearby.”


Maps showing hole locations and full analytical results are available at


Hole No. From (m) To (m) Interval (m) Au (g/t) uncut Host
OSK-W-19-1970-W1 3139.0 3330.0 191 1.04 Mafic Volcanics
*including 3168.9 3170.3 1.4 11.4 Felsic Porphyritic Intrusion
*including 3199.0 3200.0 1.0 15.4 Felsic Porphyritic Intrusion
including 3274.5 3277.0 2.5 10.1 Andesite


Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. *Osisko news release dated January 29, 2020.


Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Elevation Section
OSK-W-19-1970-W1 090 -51 3467 451913 5435346 401 2425


OSK-W-19-1970-W1 intersected 10.1 g/t Au over 2.5 metres. The interval consists of 1% disseminated pyrite and quartz-carbonate veins hosted in a strong biotite and moderate chlorite and carbonate altered andesite.


Qualified Person


The scientific and technical content of this news release has been reviewed, prepared and approved by Mr. Louis Grenier, M.Sc.A., P.Geo. (OGQ 800), Project Manager of Osisko’s Windfall 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 determination is estimated at 55-80% of the reported core length interval for the zone. 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. Except when specified, 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 1-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at (i) ALS Laboratories in Val d’Or, Québec, Thunder Bay, Ontario, Sudbury, Ontario or Vancouver, British Colombia, or (ii) Bureau Veritas in Timmins, Ontario. The 1-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 multi-elements, including silver, using an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control and interpretation of results is 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% of sample pulps are sent to secondary laboratories for check assay.


About the Windfall Gold Deposit


The Windfall gold deposit is located between Val-d’Or and Chibougamau in Eeyou Istchee James Bay, Québec, Canada. The mineral resource defined by Osisko, disclosed in the February 19, 2020 news release and assuming a cut-off grade of 3.5 g/t, comprises 4,127,000 tonnes at 9.1 g/t Au (1,206,000 ounces) in the indicated mineral resource category and 14,532,000 tonnes at 8.40 g/t Au (3,938,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in the February 19, 2020 news release, certain of which are described in the February 19, 2020 news release, will be further described in the full technical report being prepared for this updated mineral resource estimate in accordance with NI 43-101, and will be available on SEDAR ( under the Corporation’s issuer profile within 45 days from the February 19, 2020 news release. The Windfall gold deposit is currently one of the highest-grade resource-stage gold projects in Canada and has world-class scale. Mineralization occurs in three principal zones: Lynx, Main Zone, and Underdog.  Mineralization is generally comprised of sub-vertical zones following intrusive porphyry contacts plunging to the northeast. The deposit is well defined from surface to a depth of 1,200 metres and remains open along strike and at depth. Mineralization has been identified 30 metres from surface in some areas and as deep as 2,000 metres in others, with significant potential to extend mineralization 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% interest in the high-grade Windfall gold deposit located between Val-d’Or and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quévillon area (over 2,700 square kilometres).


Posted February 25, 2020

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