Osisko Windfall Infill Drilling
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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.
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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).