Radisson Mining Resources Inc. (RDS) has reached a significant milestone at its 100%-owned O'Brien project in Quebec, returning the highest drill assay in the company's history. The result, intercepted in drill hole OB-26-385W4, yielded 1,603.95 grams per tonne (g/t) gold over one metre, nested within a broader mineralized interval of 316.31 g/t gold over 5.1 metres. This intercept, observed in Pontiac Formation rocks, suggests the potential for a new, high-grade zone located outside the project’s existing mineral resources.

"We are taking the unusual step of releasing three holes from our ongoing step-out drill program at O'Brien because of the significant nature of the results received."

"Importantly, it occurs within a cluster of previously published gold intercepts, offering the potential for a new, very high-grade zone of mineralization outside of the scope of the Project's current mineral resources."
— Matt Manson, President and CEO

The company is currently executing a 140,000-metre step-out drill program to aggressively test the extent of the mineralization, with eight drill rigs actively turning on-site. Management has prioritized exploring deep extensions of the system, setting an exploration floor at 2.5 kilometres depth. Hole OB-26-384W1, another of the holes highlighted, returned significant high-grade mineralization within the Larder Lake-Cadillac Break at depths between 1,600 and 1,700 metres, further confirming the deep continuity of the system.

A third hole, OB-26-386W3, targeted the gap between the project's mineralized trends, demonstrating that mineralization remains open in multiple directions. These results underscore the effectiveness of Radisson's technical approach in identifying and defining new high-grade gold zones. To provide further details on these developments and the ongoing exploration strategy, Radisson will host a technical webinar on Tuesday, July 14, 2026.

Read the full announcement: Radisson Reports Highest-Ever Assay Result at O'Brien: 1,604 g/t (1.60 kg/t) Gold over 1.0 Metre Within 316 g/t Gold over 5.1 Metres