Radisson expands O'Brien drill program to 140,000 m

Executive Summary

• Radisson Mining Resources Inc. is expanding its step-out exploration drill program at the O'Brien gold project to a total of 140,000 metres, utilizing up to eight drill rigs, marking the largest drill program in the project's history.
• The expansion follows a successful $25-million financing and aims to delineate new high-grade gold mineralization outside the current Mineral Resource Estimate (MRE), targeting an exploration potential of 3–4 million ounces of gold in 15–20 million tonnes at 4.5–8.0 g/t Au.
• Recent drilling has confirmed high-grade mineralization beneath historic mine workings and below existing resources, with specific intercepts including 31.24 g/t Au over 8.0m (including 242.0 g/t Au over 1.0m) at ~1,500m vertical depth.

Key Details

• Drill Program Expansion: Total program increased to 140,000 metres; scope expanded from four to eight drill rigs.
• Timeline: The expanded program will continue through 2026. The first additional rig has been mobilized, with drilling expected to start prior to the end of the current month.
• Recent Progress: By the end of 2025, approximately 35,000 metres are expected to be completed of the original 50,000–60,000-metre program announced in May 2025.
• Significant Intercepts:
  • Pilot hole beneath historic mine workings: 31.24 g/t Au over 8.0 metres, including 242.0 g/t Au over 1.0 metre at approximately 1,500 metres vertical depth (500 metres below the final mining stope).
  • Seven wedges from pilot holes delineated up to six high-grade, gold-bearing veins over an area of ~250m (E-W) by 250m (vertical).
  • Stepout drilling confirmed high-grade mineralization 170 metres below the base of existing resources at Trend No. 1 and up to 300 metres below previous intercepts at Trend No. 2.
• Exploration Targets:
  • Pilot holes and wedge clusters beneath the historic mine to 2km depth.
  • Testing deep extensions of Trends No. 0, No. 1, and No. 2.
  • Testing for mineralization between Trends No. 1 and No. 2.
  • Testing extensions beneath the historic Thompson-Cadillac mine.
• Current Mineral Resource Estimate (MRE):
  • Indicated: 580,000 ounces (2.20 million tonnes at 8.2 g/t Au).
  • Inferred: 930,000 ounces (6.67 million tonnes at 4.4 g/t Au).
  • Effective date: May 6, 2025 (based on 325,509 metres of drilling completed to end of 2022).
• Strategic Context: The expansion supports the thesis that mesothermal gold mineralization continues to an exploration horizon of at least two kilometres depth. The goal is to demonstrate the full potential scope of the project and generate updates to the MRE.
• Financing Context: Expansion follows a $25-million financing completed in October 2025.
• Preliminary Economic Assessment (PEA): Describes a high-value project using neighbouring milling facilities to reduce capital costs and development risk.

Notable Quotes

• Matt Manson, President and CEO: "Following the recent completion of our very successful $25-million financing... we are announcing a major increase in scope and ambition to our exploration drill program at O'Brien... Our exploration target at O'Brien is between three and four million ounces of gold in 15 to 20 million tonnes at between 4.5 and 8.0 grams per tonne gold."
• Matt Manson, President and CEO: "The recently completed O'Brien preliminary economic assessment (PEA) describes a high-value project... It also represents a moment-in-time snapshot for the project utilizing the pre-existing MRE... Our objective by the end of this new and aggressive drill program will be to demonstrate full potential scope of the project."