Osisko Gold Confirms Presence of Mineralized System with Open Pit Potential at the Proserpine Target on the Cariboo Gold Project's Regional Property; Exploration Drilling Highlights Include 95.93 g/t Au over 4.60 m at 71 m Vertical Depth and 5.46 g/t Au

TORONTO, Aug. 05, 2026 (GLOBE NEWSWIRE) -- Osisko Gold Group Inc. (NYSE: OGG, TSXV: OGG) ("Osisko Gold" or the "Company") is pleased to announce its first set of new diamond drilling results consisting of fourteen holes from the surface exploration program on the Proserpine regional greenfield target, located within the broader Cariboo Gold Project property boundary and approximately 7 kilometres ("km") from the Company's permitted, 100%-owned Cariboo Gold Project (the "Project") in central British Columbia, Canada.