Osisko Development Corp. announced drilling results from the 200,000-meter 2021 exploration and category conversion drill program campaign at its Cariboo Gold Project in central British Columbia. A total of ten diamond drill rigs are currently active on the Project. Drilling Summary: 41,000 meters in 134 holes have been drilled at Island Mountain thus far in 2021. Island Mountain encompasses both the Mosquito Creek and Shaft Zone deposits. Recent assay results include holes IM-21-024 to IM-21-036. Drilling highlights include 35.25 g/t Au over 11.00 meters in hole IM-21-024 (Figure 2) at Mosquito Creek within a silicified sandstone to calcareous sandstone unit with 5% pyrite hosted in axial planar veins and intersected by fault structures. Shaft Zone hole IM-21-035 assayed 18.80 g/t Au over 6.20 meters and included multiple high-grade samples such as 102.00 g/t Au over 0.70 meter and is a mineralized vein corridor with replacement mineralization. Recent Drilling Highlights: 35.25 g/t Au over 11.00 metres in hole IM-21-024 including; 239.00 g/t Au over 1.50 metres; 11.14 g/t Au over 9.40 metres in hole IM-21-029 including; 66.30 g/t Au over 0.50 meter; 21.69 g/t Au over 6.35 meters in hole IM-21-031 including; 53.00 g/t Au over 1.00 meter and; 50.10 g/t Au over 0.70 meter; 24.60 g/t Au over 1.20 meters in hole IM-21-033; 18.80 g/t Au over 6.20 meters in hole IM-21-035 including; 102.00 g/t Au over 0.70 meter and; 33.10 g/t Au over 0.75 meter; 21.11 g/t Au over 2.80 meters in hole IM-21-035 including; and 63.20 g/t Au over 0.75 meters. Mineralized quartz veins on Cariboo are overall sub-vertical dip and northeast strike. Vein corridors are defined as a high-density network of mineralized quartz veins within the axis of the last folding event and hosted within a brittle meta-sandstone or calcareous meta-sandstone. Vein corridors are modelled at a minimum thickness of 2 meters and average about 4.5 meters true width. Individual mineralized veins within these corridors have widths varying from centimeters to several meters and strike lengths from a few meters to over 50 meters. These corridors have been defined from surface to a vertical depth averaging 300 meters and remain open for expansion at depth and along strike. Gold grades are intimately associated with quartz vein-hosted pyrite as well as pyritic, intensely silicified wall rock haloes in close proximity to the veins. True widths are estimated to be 60% to 75% of reported core length intervals. Intervals not recovered by drilling were assigned zero grade. Top cuts have not been applied to high grade assays.