TORONTO, April 29, 2020 (GLOBE NEWSWIRE) -- Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide new drilling results from the ongoing definition and expansion drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

Operations remain temporarily suspended in respect of the Government of Québec’s closure of all non-essential business in effort to contain COVID-19. When drilling resumes, it will remain focused on the Lynx deposit, the main mineralized zones, and down plunge exploration in the central areas of the mineralized system.

Significant new analytical results from the definition drilling program on Lynx and Triple Lynx are presented below and include 44 intercepts in 16 drill holes, 2 extensions and 13 wedges.

Of note is drill hole OSK-W-20-2217-W2 which returned 35.3 g/t Au over 2.7 metres, confirming the up-plunge extension of the Triple Lynx zone 120 metres from nearest wireframe (see Osisko news release dated February 19, 2020). Also, drill hole OSK-W-19-2170 returned 40.2 g/t Au over 3.5 metres confirming high grade in the down plunge area of Triple Lynx.

Selected high-grade intercepts from new results include: 104 g/t Au over 2.0 metres in WST-20-0323; 76.5 g/t Au over 2.6 metres in OSK-W-18-1747-W1; 41.2 g/t Au over 4.2 metres in WST-20-0386; and 73.6 g/t Au over 2.3 metres in OSK-W-19-1193-W2.  Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Infill Drilling

Hole No.From (m)To (m)Interval (m)Au (g/t) uncutAu (g/t) cut to 100 g/tZoneCorridor
OSK-W-17-1000573.0577.34.38.92 Lynx_301Lynx
including573.0574.01.017.1 
OSK-W-18-1639754.0757.03.08.80 Lynx_336Lynx
including754.0755.01.015.6 
OSK-W-18-1741-W1916.1918.72.676.550.0Lynx_329Lynx
including916.1917.00.9177100
 926.0928.02.04.90 Lynx 4Lynx
OSK-W-19-1104-W4470.6473.02.43.42 Lynx_359Lynx
including471.3471.60.325.6 
 575.0577.72.73.72 Lynx_321Lynx
including576.5576.90.417.6 
OSK-W-19-1193-W2928.2930.52.373.630.6Lynx_314Lynx
including928.6929.20.6265100
OSK-W-19-1731-W2591.0593.02.07.70 Lynx_322Lynx
including591.0592.01.014.5 
OSK-W-19-2059-W1833.9836.32.411.1 Lynx_313Lynx
including834.8835.70.927.3 
OSK-W-19-2067-W41028.01030.52.53.25 Lynx_368Lynx
OSK-W-19-2139-W2887.4894.06.68.34 Lynx_363Lynx
OSK-W-19-2170923.1926.63.540.2 Triple LynxTriple Lynx
including923.7924.71.098.0 
OSK-W-19-2197759.8762.02.24.04 LynxLynx
OSK-W-20-1272-W6898.0900.02.010.2 Lynx_364Triple Lynx
including899.0899.40.445.2 
OSK-W-20-1741-W2860.0862.02.03.20 Lynx_347Lynx
 899.0901.02.04.29 Lynx_313Lynx
including899.4900.00.613.6 
OSK-W-20-2059-W3701.3704.02.711.2 Lynx_315Lynx
including703.1704.00.929.3 
OSK-W-20-2217-W1877.0879.02.03.29 Triple LynxTriple Lynx
including877.0877.40.49.71 
OSK-W-20-2217-W2755.2757.92.735.317.0Triple LynxTriple Lynx
including756.3756.60.3265100
OSK-W-20-2243-W1814.0816.02.05.36 Lynx_363Lynx
WST-19-0328118.0120.02.025.9 Lynx_304Lynx
including118.5119.00.599.1 
WST-20-02608.810.92.110.1 Lynx_310Lynx
including8.89.40.626.9 
 51.053.02.06.29 Lynx_304Lynx
including51.752.10.431.0 
WST-20-026155.057.02.08.28 Lynx_304Lynx
including55.756.20.532.9 
WST-20-030852.654.72.14.56 Lynx_311Lynx
including53.654.10.516.9 
 81.183.42.33.48 Lynx_320Lynx
 95.098.33.34.09 Lynx_319Lynx
WST-20-031658.761.12.419.7 Lynx_311Lynx
WST-20-031966.869.83.024.318.8Lynx_323Lynx
including69.469.80.4141100
 77.680.02.43.95 Lynx_308Lynx
 86.088.02.08.09 Lynx_320Lynx
including86.086.50.531.4 
 94.597.12.622.6 Lynx_304Lynx
including94.594.90.494.4 
WST-20-032150.253.02.84.32 Lynx_303Lynx
including50.251.00.815.1 
 65.467.82.43.55 Lynx_323Lynx
WST-20-032368.570.52.010435.9Lynx_323Lynx
including69.169.80.7296100
WST-20-0367A110.0112.02.04.31 Lynx_323Lynx
including110.0110.60.614.3 
 126.7128.82.14.97 Lynx_359Lynx
including127.6128.40.812.9 
WST-20-0377125.1127.22.14.56 Lynx_304Lynx
WST-20-0386134.1138.34.241.222.4Lynx_304Lynx
including138.0138.30.3363100
WST-20-041377.079.02.03.44 Lynx_323Lynx
 85.888.02.224.3 Lynx_308Lynx
including85.886.91.148.3 
 99.5101.72.218.9 Lynx_304Lynx
including101.2101.70.569.6 
WST-20-041459.762.02.34.43 Lynx_311Lynx
including61.161.40.324.9 
WST-20-0426141.0143.42.49.12 Lynx_304Lynx
including142.2142.80.628.8 

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 NumberAzimuth (°)Dip (°)Length (m)UTM EUTM NElevationSection
OSK-W-17-1000142-5078645340854354624013800
OSK-W-18-1639142-53116445326654353974053625
OSK-W-18-1741-W1144-48108345332854354664063725
OSK-W-19-1104-W4142-5093345338354354554023775
OSK-W-19-1193-W2141-59109545380754357214004275
OSK-W-19-1731-W2139-5199645338354355184093800
OSK-W-19-2059-W1131-52104145344654354774003825
OSK-W-19-2067-W4123-53120345324154356974163750
OSK-W-19-2139-W2115-52120345298054355494203450
OSK-W-19-2170128-59120345342554356574133900
OSK-W-19-2197121-48105945308754355274183550
OSK-W-20-1272-W6127-60103545324654355354123675
OSK-W-20-1741-W2144-4897245332854354664063725
OSK-W-20-2059-W3131-52102945344654354774003825
OSK-W-20-2217-W1134-48104445294354355664193425
OSK-W-20-2217-W2134-4889345294354355664193425
OSK-W-20-2243-W1122-5496045308754355274183550
WST-19-03281393914145321754351152253450
WST-20-0260169348745329854350672063500
WST-20-0261169257345329854350662053500
WST-20-0308172-1316045329154351391633525
WST-20-0316133-1912445329254351391633525
WST-20-0319134-311845329254351391633525
WST-20-0321127-2213345329254351391633525
WST-20-0323115615145329254351401633525
WST-20-0367A163-3416645345054352641153725
WST-20-0377161-4217545349354352861163775
WST-20-0386163-4717845349354352861163775
WST-20-0413119-2113945329254351401633525
WST-20-0414136-1412145329254351391633525
WST-20-0426142-4717245349354352871163775

Lynx Zone
Mineralization in the Lynx zone is typically characterized by trace to 15% disseminated, clustered or stringer pyrite (locally up to 70%), local visible gold, trace to 3% sphalerite, chalcopyrite, and galena, local ptygmatic pyrite-tourmaline or tourmaline veinlets, quartz-carbonate veins (locally crustiform), smoky quartz veins and veinlets, and local chlorite-calcite or quartz-carbonate chlorite fracture filling. Alteration consists of weak to strong sericite, weak to strong silica with areas of local pervasive silica flooding, weak to moderate chlorite and carbonate, and locally weak to strong fuchsite. Mineralization is hosted in or at the contacts of felsic porphyritic or fragmental intrusions with rhyolites, andesites (locally bleached), or gabbros.

Triple Lynx Zone
Mineralization in the Triple Lynx zone is typically characterized by trace to 30% disseminated, clustered or stringer pyrite, local visible gold, trace sphalerite, chalcopyrite, and galena, local quartz-tourmaline veins (up to 20%), local ptygmatic tourmaline veins, and local smoky quartz and quartz-carbonate veins. Alteration consists of weak to strong sericite, weak to strong silica with areas of local pervasive silica flooding, weak to moderate chlorite and carbonate, and locally weak to strong fuchsite. 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 an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control ("QA/QC") 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 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).

Cautionary Note Regarding Forward-Looking Information
This news release contains "forward-looking information" within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. Any statement that involves predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often, but not always, using phrases such as "expects", or "does not expect", "is expected", "interpreted", "management's view", "anticipates" or "does not anticipate", "plans", "budget", "scheduled", "forecasts", "estimates", "potential", "feasibility", "believes" or "intends" or variations of such words and phrases or stating that certain actions, events or results "may" or "could", "would", "might" or "will" be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. This news release contains the forward-looking information pertaining to, among other things: the Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale; the key assumptions, parameters and methods used to estimate the mineral resource estimate; the prospects, if any, of the Windfall gold deposit; the timing and ability of Osisko, if at all, to publish a feasibility study for the Windfall gold deposit; the projected capital expenditures of mining activities at the Windfall gold deposit; upgrading an inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the deposit remaining open along strike to the northeast and at depth; significant high-grade zones (Lynx 4, Triple Lynx) remaining open down plunge; the plunge potential of the Lynx and Underdog zones; the significance of historic exploration activities and results. Such factors include, among others, risks relating to the ability of exploration activities (including drill results) to accurately predict mineralization; errors in management's geological modelling; the ability of Osisko to complete further exploration activities, including drilling; property and royalty interests in the Windfall gold deposit; the ability of the Corporation to obtain required approvals; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, Osisko cannot assure shareholders and prospective purchasers of securities of the Corporation that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither Osisko nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information. Osisko does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law.

CONTACT INFORMATION:
John Burzynski
President & Chief Executive Officer
Telephone (416) 363-8653