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Osisko Mining Inc.

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Summary

Project:

Windfall

Deposit:Windfall
Location:Canada
Commodities:Gold
Date:1/16/2019
Report Code:NI43-101
Report Type:Exploration/Drilling Update
Project Stage:Pursuing Resource Increase/Upgrade
Report details:16-1-2019: Osisko Mining Inc. announces an Exploration/Drilling Update report for its Windfall deposit at the Windfall project. Drilling results incl. 2.0m @ 38.4g/t Au from 1858.9m. (Toronto, January 16, 2019) Osisko Mining Inc. (OSK:TSX. "Osisko" or the
Resources:(Resource): 2.874Mt @ 8.17g/t Au (Ind.) and 10.352Mt @ 7.11g/t Au (Inf.) at Lynx
CP/QP:[Overall Report]: Louis Grenier (Internal)
ABSTRACT:(Toronto, January 16, 2019) Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide new results from the ongoing Triple 8 deep-hole exploration program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. In May 2018 Osisko commenced deep exploration drilling to investigate the potential for depth extensions of the main mineralized zones, as well as to further test the intrusion-related geological model for the Windfall deposit. In July 2018 Osisko discovered “Triple 8”, a developing new corridor of mineralization at the Windfall deposit, at 1,425 metres vertical depth. Today’s new drill results confirm and expand on the initial discovery (please see Osisko news releases dated July 11, 2018 and September 13, 2018). Drill hole OSK-W-18-1783 tested the continuity at the mid-point between OSK-W-18-1603 (Triple 8 discovery hole) and gold mineralization intersected in a similar setting in OSK-W-18-1616-W1 (see Osisko news release dated August 7, 2018). OSK-W-18-1783 encountered three distinct altered intervals between 1,819 metres and 1,945 metres downhole, each averaging approximately 10 metres width. Significant results from the three gold bearing intervals include 38.4 g/t Au over 2.0 metres and 16.0 g/t Au over 2.3 metres and. Geometry is still being interpreted, however mineralization is open in all directions. Sericite and silica alteration are hosted within an andesite and gabbro package, surrounded by peripheral chlorite - biotite +/- garnet alteration (identical to that encountered in the Triple 8 discovery hole 350 metres to the north, and in hole OSK-W1616-W1, 400 metres to the south). The mineralized intervals contain disseminated and stringer pyrite with local visible gold, and trace pyrrhotite and chalcopyrite.

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