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Osisko Infill Drilling Windfall. Good Results Include 86.2 g/t Au over 14.5 Metres and 327 g/t Au over 2.2 Metres

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Osisko Mining Inc. (TSX:OSK) is pleased to provide new analytical results from the ongoing expansion and definition drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

 

Drilling is currently focused on the Lynx deposit. Osisko Chief Executive Officer John Burzynski commented: “We remain very pleased with Lynx’s consistent good results on grade and widths.”

 

The table below contains resource definition infill intercepts located inside the February 2020 mineral resource estimate wireframes (see Osisko news release dated February 19, 2020). Significant new analytical results are presented below and include 27 intercepts in 10 drill holes and 9 wedges.

 

Selected high-grade intercepts from the new results include: 86.2 g/t Au over 14.5 metres in OSK-W-2256-W5; 327 g/t Au over 2.2 metres in WST-20-0569; 85.0 g/t Au over 10.8 metres in OSK-W-20-2133-W4; 94.9 g/t Au over 2.1 metres in WST-20-0508; and 71.3 g/t Au over 4.0 metres in OSK-W-2252-W5. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

 

 

Hole No. From
(m)
To
(m)
Interval
(m)
Au (g/t)
uncut
Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-W-20-2133-W4 928.8 939.6 10.8 85.0 22.7 Lynx_331 Triple Lynx
including 931.0 933.1 2.1 420 100
OSK-W-20-2252-W5 854.7 856.9 2.2 18.6   Lynx_371 Triple Lynx
including 855.6 856.0 0.4 97.3  
  882.3 886.3 4.0 71.3 43.8 Lynx_371 Triple Lynx
including 884.1 884.6 0.5 234 100
and 885.9 886.3 0.4 375 100
OSK-W-20-2252-W7 943.6 950.1 6.5 36.0 25.8 Lynx_368 Triple Lynx
including 943.9 945.2 1.3 151 100
OSK-W-20-2256-W5 858.5 873.0 14.5 86.2 16.4 Lynx_361 Triple Lynx
including 868.1 868.4 0.3 230 100
and 868.4 868.7 0.3 3120 100
and 869.0 869.3 0.3 321 100
OSK-W-20-2275-W2 906.6 910.3 3.7 7.56   Triple Lynx Triple Lynx
including 909.0 909.5 0.5 25.7  
OSK-W-20-2280-W2 998.4 1001.1 2.7 11.2   Lynx_368 Triple Lynx
  1027.9 1031.3 3.4 5.60   Lynx_363 Triple Lynx
including 1027.9 1028.3 0.4 28.3  
OSK-W-20-2295-W2 654.0 656.0 2.0 16.1   Lynx_376 Triple Lynx
including 654.5 655.0 0.5 51.9  
OSK-W-20-2295-W3 697.0 699.0 2.0 5.11   Triple Lynx Triple Lynx
including 698.1 698.5 0.4 22.8  
OSK-W-20-2313-W2 986.3 988.3 2.0 6.69   Triple Lynx Triple Lynx
OSK-W-20-2339 608.3 610.5 2.2 8.59   Triple Lynx Triple Lynx
WST-20-0473 101.0 103.0 2.0 12.3   Lynx_304 Lynx
including 102.5 103.0 0.5 48.6  
WST-20-0486 93.0 95.0 2.0 5.03   Lynx_323 Lynx
WST-20-0487 103.7 106.0 2.3 25.2   Lynx_359 Lynx
including 104.4 105.0 0.6 53.2  
WST-20-0500 132.0 134.5 2.5 10.1   Lynx_304 Lynx
including 132.9 133.6 0.7 35.9  
WST-20-0506 82.7 85.1 2.4 6.21   Lynx_311 Lynx
WST-20-0508 51.4 53.5 2.1 6.01   Lynx_311 Lynx
including 52.8 53.1 0.3 37.7  
  70.5 72.8 2.3 9.05   Lynx_323 Lynx
  77.4 80.0 2.6 4.45   Lynx_308 Lynx
including 77.7 78.1 0.4 21.9  
  93.9 96.0 2.1 94.9 22.0 Lynx_304 Lynx
including 93.9 94.3 0.4 483 100
  109.0 111.2 2.2 19.2   Lynx_359 Lynx
including 110.7 111.2 0.5 71.7  
WST-20-0511 82.5 88.4 5.9 15.6   Lynx_308 Lynx
including 83.4 84.0 0.6 79.7  
  92.0 94.0 2.0 9.36   Lynx_304 Lynx
including 93.6 94.0 0.4 45.0  
WST-20-0515 156.0 158.0 2.0 24.4 20.4 Lynx_323 Lynx
including 157.0 157.4 0.4 120 100
  169.0 171.0 2.0 25.0 21.0 Lynx_304 Lynx
including 169.0 169.4 0.4 120 100
WST-20-0569 310.5 312.7 2.2 327 28.2 Lynx_356 Lynx
including 310.5 311.1 0.6 1195 100

 

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below.

 

 

Drill hole location

 

Hole Number Azimuth
(°)
Dip
(°)
Length
(m)
UTM E UTM N Elevation Section
OSK-W-20-2133-W4 118 -49 987 453080 5435531 417 3525
OSK-W-20-2252-W5 129 -54 1092 453241 5435694 415 3750
OSK-W-20-2252-W7 129 -54 1089 453241 5435694 415 3750
OSK-W-20-2256-W5 125 -51 1022 453160 5435686 414 3675
OSK-W-20-2275-W2 127 -49 1035 452886 5435584 409 3400
OSK-W-20-2280-W2 127 -58 1211 453304 5435639 415 3775
OSK-W-20-2295-W2 132 -51 963 452938 5435472 415 3375
OSK-W-20-2295-W3 132 -51 969 452938 5435472 415 3375
OSK-W-20-2313-W2 134 -52 1047 452965 5435583 420 3450
OSK-W-20-2339 144 -50 1025 452960 5435442 415 3400
WST-20-0473 149 -16 202 453493 5435287 117 3775
WST-20-0486 130 -37 162 453359 5435209 154 3625
WST-20-0487 140 -5 177 453358 5435208 155 3625
WST-20-0500 139 -30 166 453228 5435126 135 3475
WST-20-0506 175 20 141 453357 5435208 156 3625
WST-20-0508 136 -12 138 453316 5435165 124 3575
WST-20-0511 137 8 162 453316 5435165 125 3575
WST-20-0515 158 -33 186 453418 5435305 68 3725
WST-20-0569 165 -59 526 453104 5435065 231 3325

 

Lynx Zone

 

Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. The vein-type is associated with haloes of pervasive sericite-pyrite ± silica alteration and contain sulphides (predominantly pyrite with minor amounts of chalcopyrite, sphalerite, galena, arsenopyrite, and pyrrhotite) and local visible gold. Replacement mineralization is associated with strong pervasive silica-sericite-ankerite ± tourmaline alteration and contains disseminated pyrite from trace to 80% with local visible gold. Pyrite stockworks can form envelopes that reach several tens of metres thick. Fuchsite alteration is common and is spatially constrained to near the gabbros. Mineralization occurs at or near geological contacts between felsic porphyritic or fragmental intrusions and the host rhyolites or gabbros and locally can be hosted along the gabbro-rhyolite contact.

 

Triple Lynx

 

Mineralization in the Triple Lynx zone is vein-type, quartz-carbonate-pyrite-tourmaline veins, associated with pervasive sericite-pyrite ± silica alteration and contain sulphides similar to the main Lynx Zone, pyrite dominated with minor other sulphides, ranging from trace to up to 70% locally, and local visible gold. Locally fuchsite is present when proximal to the gabbros. Mineralization is hosted in or at the contacts of felsic porphyritic dikes with rhyolites (locally bleached) or gabbros.

 

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 Lake gold project, who is a “qualified person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

 

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. 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 a four acids digestion -MS61 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, as disclosed in the news release dated February 19, 2020 and supported by the technical report entitled “An updated mineral resource estimate for the Windfall Lake Project, Located in the Abitibi Greenstone Belt, Urban Township, Eeyou Istchee James Bay, Québec, Canada” and dated April 3, 2020 (with an effective date of January 3, 2020), 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 are further described in the full technical report prepared by Micon International Limited (“Micon”) and BBA Inc (“BBA”), in accordance with NI 43-101 available on SEDAR (www.sedar.com) under the Corporation’s issuer profile. 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 deformed sub-vertical zones plunging to the northeast. Vein-type or pyrite replacement-type styles of mineralization crosscut syn-volcanic host rocks and syn-deformation felsic porphyry intrusions and are spatially associated with the contacts of the intrusions. 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 November 24, 2020

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