Osisko Development Corp. announced drilling results from the 200,000-meter 2021 exploration and category conversion drill program campaign at its Cariboo Gold Project (“Cariboo”) in central British Columbia. A total of ten diamond drill rigs are currently on the Project. Drilling Summary: A total of 16,000 meters in 52 holes have been drilled thus far in 2021 on the Lowhee Deposit Zone, the strike extension of the Cow Deposit, located on Barkerville Mountain. Recent assay results include holes BM-21-020 to BM-21-036. Drill holes BM-21-031, BM-21-033 and BM-21-035 (Figure 3) intersected multiple mineralized vein corridors and include highlights of 45.80 g/t Au over 0.75meters in drillhole BM-21-031, 16.05 g/t Au over 7.50 meters, including a sample of 93.70 g/t Au over 0.80meters, located 20 meters from surface in BM-21-033 and 15.20 g/t Au in 4.85 meters in BM-21-035. Mineralization has now been defined to a vertical depth of 350 meters and remains open at depth and along strike to the southeast. Recent Drilling Highlights: 3.07 g/t Au over 16.20 meters in hole BM-21-023; 11.35 g/t Au over 3.60 meters in hole BM-21-024; 11.79 g/t Au over 2.80 meters in hole BM-21-025; 17.44 g/t Au over 3.45 meters in hole BM-21-025 including; 69.20 g/t Au over 0.80 meter; 3.44 g/t Au over 11.10 meters in hole BM-21-026; 15.15 g/t Au over 2.00 meters in hole BM-21-027; 14.65 g/t Au over 4.15 meters in hole BM-21-028 including; 29.40 g/t Au over 1.45 meters; 20.02 g/t Au over 2.65 meters in hole BM-21-028 including; 61.70 g/t Au over 0.50 meters; 57.20 g/t Au over 0.55 meter in hole BM-21-029; 45.80 g/t Au over 0.75 meter in hole BM-21-031; 16.05 g/t Au over 7.50 meter in hole BM-21-033 including; 93.70 g/t Au over 0.80 meter; 50.20 g/t Au over 0.60 meter in hole BM-21-034; 11.70 g/t Au over 4.40 meters in hole BM-21-034 including; 47.40 g/t Au over 0.85 meter; 15.20 g/t Au over 4.85 meters in hole BM-21-035; 10.12 g/t Au over 3.05 meters in hole BM-21-035; 60.90 g/t Au over 0.55 meter in hole BM-21-036; 19.04 g/t Au over 4.25 meters in hole BM-21-036 including; 39.50 g/t Au over 1.30 meters; 27.45 g/t Au over 2.35 meters in hole BM-21-036. The primary focus of the drilling at Valley Zone is to increase indicated category ounces to support ongoing feasibility study. These excellent results from Valley Zone are hitting designed targets and expanding the vein corridors at depth. 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’s folds 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.