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Osisko Mining Inc.

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Summary

Project:

Windfall Lake

Deposit:Extension
Location:Canada
Commodities:Gold
Date:12/5/2016
Report Code:NI43-101
Report Type:Exploration/Drilling Update
Project Stage:Pursuing Resource Increase/Upgrade
Report details:5-12-2016: Osisko Mining Inc. announces an Exploration/Drilling Update report for its Extension deposit at the Windfall Lake project. Drilling results incl. 5.7m @ 148g/t Au from 226.3m. (Montréal, December 5, 2016). Osisko Mining Inc. (OSK:TSX, "Osisko"
Resources:(Resource): 2.762Mt @ 8.42g/t Au (Ind.) and 3.512Mt @ 7.62g/t Au (Inf.)
CP/QP:[Overall Report]: Jean-Philippe Desrochers (Internal)
ABSTRACT:(Montréal, December 5, 2016). Osisko Mining Inc. (OSK:TSX, "Osisko" or the "Corporation") is pleased to announce new results from the ongoing 150,000 metre drill program at its 100% owned Windfall Lake gold project located in the Urban Township, Québec. The recently commenced expansion program included step-out drilling along fences located 200, 400, 600 and 800 metres northeast of the main deposit. The program is testing a linear magnetic depression that is interpreted to be related to a magnetite destructive silica-sericite alteration corridor associated with the Windfall intrusive system. The linear structure currently being investigated with the step out drilling is parallel to the Windfall deposit and extends for an additional 2600 metres northeast of the deposit. The magnetic feature was identified in the high-resolution airborne magnetic survey conducted earlier in the year by Osisko. Initial drill holes have been completed on the first three step out lines extending 600 metres from the last known mineralized intercept in the main deposit. The initial holes on all three lines have encountered mineralized zones characteristic of the main Windfall deposit, providing strong support for management’s view that the deposit continues along the extension program area. Assays are pending from the drill holes on the 200 and 400 metre step out lines and for the lower half of the drill hole reported today. The 800 metre step out fence will commence shortly. Initial analytical results presented below are from DDH OSK-W-16-760, one of the first drill holes located on the 600 metre fence, which intersected 65.0 g/t Au over 5.7 metres(148 g/t Au over 5.7 metres uncut) at a vertical depth of 200 metres. The mineralization and alteration is very similar to known zones in the Windfall deposit, consisting of a strong dark silica breccia and flooding with pyrite stringers and abundant visible gold.

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