Osisko Mining Inc
Osisko deep drilling gold discovery at Windfall
Wednesday, Aug 08, 2018
Osisko Mining Inc. is pleased to provide new results from the ongoing 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 two deep exploration drill holes ("Deep Underdog" and "Deep Lynx") to investigate the potential for depth extensions of the Lynx and Underdog mineralized zones, as well as to further test the intrusion-related geological model for the Windfall deposit at depths of approximately 2500 metres from surface.  Drilling on the Deep Lynx hole is still in progress, and wedge holes for both Deep Lynx and Deep Underdog are planned.

Following the discovery of Triple 8 Zone in the "Deep Underdog" hole (as disclosed in Osisko's news release dated July 11, 2018), the down-plunge projection of the gold mineralized structure was interpreted to lie in the path of the "Deep Lynx" hole, OSK-W-18-1616-W1, at target depth of approximately 1950 meters downhole. Alteration and mineralization related to the new intersection occurs in the Deep Lynx hole between 1985.1 metres and 1991.5 metres downhole (approximately 1900 metres vertical depth from surface), including two intervals containing visible gold.  Maps and sections showing the location of the Deep Lynx drill hole and the new mineralized zone are provided on the Corporation's website.

The new gold bearing zone appears to be sub-vertical and has an estimated true thickness of 2.5 metres. Mineralization occurs as up to 12% pyrite stringers, pyrrhotite, chalcopyrite and local visible gold associated with minor quartz-carbonate veins. The hosting andesite is bleached, with sericite alteration and is crosscut by metre scale felsic porphyritic dike. Exact geometries and relationship to the Triple 8 discovery is currently unknown.  Drilling in the Deep Lynx hole is still in progress.  Wedge holes are being planned to further investigate the new mineralized zone.

Osisko President and CEO John Burzynski commented: "We are very pleased with the continuing success of our deep hole exploration program at Windfall.  Our geological model is predicting where to find new extensions of our deposit, and our extensive drill program is key in defining what we believe is a World Class gold system.  We are currently planning wedge holes for the Triple 8 discovery area and this new potential extension to better understand the geometry of the gold mineralization in this exciting discovery."

For more information, please visit: https://www.osiskomining.com

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