Rouyn-Noranda, Quebec — January 6, 2026 — Leads & Copy — Ressources minières Inc. (Radisson) has announced assay results from six new drill holes at its 100% owned O’Brien gold project in the Abitibi-Témiscamingue region of Quebec.
The six drill holes represent extensions at depth below the existing geological model and the past-producing O’Brien mine. The drill program, totaling 140,000 meters, is designed to assess the overall extent of gold mineralization at the Project. Two drill holes represent the 12th and 13th branches completed from pilot hole OB-24-337 and continue to expand the high-grade mineralization being outlined, intersected in multiple veins below the past-producing O’Brien gold mine.
All six drill holes published today intersected gold mineralization, with five yielding intervals with grades and thicknesses consistent with the Project’s current mineral resources, continuing a very high success rate for the ongoing drill program.
Highlights include:
- OB-25-337W13 intersected 90.60 grams per tonne (“g/t”) gold (“Au”) over 1.0 meter, within a mineralized interval averaging 30.59 g/t Au over 3.0 meters and 9.14 g/t Au over 2.7 meters including 16.35 g/t Au over 1.4 meters.
- OB-25-337W12 intersected 25.10 g/t Au over 1.5 meters and 14.20 g/t Au over 1.5 meters and 11.40 g/t Au over 1.3 meters.
- OB-25-322W2 intersected 3.11 g/t Au over 8.0 meters, including 5.93 g/t Au over 1.5 meters and 3.62 g/t Au over 4.0 meters including 6.33 g/t Au over 1.5 meters.
- OB-25-322W1 intersected 4.02 g/t Au over 4.5 meters, including 8.29 g/t Au over 1.5 meters.
Radisson President and CEO Matt Manson said the results continue to demonstrate the extension of the gold mineralization system below the past-producing O’Brien mine and the current mineral resources. Of particular note are the two new branches completed from pilot hole OB-24-337 located below the last mined stope of the old mine. These are the 12th and 13th branches completed.
Manson said the company is observing multiple high-grade intervals from quartz-sulfide veins within wider alteration envelopes. The company has modeled the gold mineralization system as being composed of at least six veins delineated over an area of 250 meters (east-west) by 500 meters (vertical), which remains open. Radisson is progressively pushing the limits of known mineralization at O’Brien laterally and at depth with the drill program.
Radisson has now completed 74 drill holes in the 140,000-meter program, with 61 intersecting mineralization with grades and thicknesses consistent with the Project’s current mineral resources, representing a success rate of 82%. Seven drills will be operating on the site as the company enters 2026, with an eighth drill expected to be added soon. Twelve additional extension drill holes, including the latest OB-24-337 branches, have been completed and are awaiting assay results.
Gold mineralization at O’Brien is found in quartz-sulfide veins within a narrow band of interbedded mafic volcanic rocks, conglomerates, and thin porphyritic andesite units of the Piché Group, which are in contact with the east-west trending Larder-Lake-Cadillac Fault.
Gold with pyrite and arsenopyrite is generally associated with shearing and pervasive biotite alteration that develops within multiple lithologies of the Piché Group and occasionally in the metasedimentary rocks of the Pontiac and Cadillac Groups.
Individual veins are generally narrow, ranging from several centimeters to several meters thick. Multiple veins are sub-parallel to each other, and with the lithologies of the Piché Group and the Larder-Lake-Cadillac Fault. Individual veins show well-established lateral continuity, with sub-vertical high-grade shoots developed over significant lengths.
The past-producing O’Brien mine produced over half a million ounces of gold from such veins and primarily from an enrichment shoot with a vertical extent of at least 1,000 meters and an average recovered grade of over 15 g/t Au. Modern exploration is focused on delineating vein mineralization to the east of the past-producing mine, with high-grade shoots becoming evident in the exploration data and described as a series of repeating shoots.
Since late 2024, Radisson has been conducting an extension drill program at depth below the past-producing O’Brien gold mine and the current mineral resources, aimed at testing the extent of mineralization at the Project. Drilling is being conducted with pilot holes followed by directional and wedge holes to maximize drilling efficiency. Radisson announced the expansion of its extension drill program to 140,000 meters using up to eight drill rigs on October 16, 2025.
The extension drill program originated from deep pilot hole OB-24-337, which was the first exploration hole drilled below the past-producing mine infrastructure since operations ceased in 1957. That hole intersected 31.24 g/t gold (Au) over 8.0 meters, including 242.0 g/t Au over 1.0 meter at approximately 1,500 meters vertical depth. With the results published today, a total of 13 branches from hole OB-24-337 have now been reported, and up to six gold-bearing veins have been delineated over an area of approximately 250 meters (east-west) by 500 meters (vertical).
The 13th branch intersected 9.14 g/t Au over 2.7 meters, including 16.35 g/t Au over 1.4 meters, within Piché Group rocks, only 40 meters below the last historically mined stope. The last two branches, the 14th and 15th, have been completed and assay results are pending. Future drilling in the area will consist of new pilot holes and extension branches to test the full continuity of mineralization to a depth of 2 kilometers.
Today’s results also include the first and second branches, completed from pilot hole OB-24-322, intersecting high-grade mineralization in the down-plunge extension of Shoot #1 at 1,280 meters and 1,360 meters vertical depth. These two branches appear to have intersected the same mineralized zone at a vertical distance of 80 meters, returning similar intervals of 4.02 g/t Au over 4.5 meters, including 8.29 g/t Au over 1.5 meters (OB-25-322W1) and 3.11 g/t Au over 8.0 meters, including 5.93 g/t Au over 1.5 meters and 3.62 g/t Au over 4.0 meters, including 6.33 g/t Au over 1.5 meters (OB-25-322W2). Additional branches have been completed from hole OB-24-322 and assay results are pending.
Drill hole OB-25-371W7 is the seventh branch, completed from the pilot hole targeting the down-plunge extension of Shoot #2. It intersected three distinct intervals of gold mineralization, short but with grades and thicknesses consistent with the Project’s mineral resources, in an unexplored area located west of Shoot #2, towards the down-plunge extension of Shoot #1. The company believes that the apparent “gap” between the deep extensions of these two mineralized Shoots is a function of drill coverage rather than mineralization. This area offers a significant opportunity to delineate future mineral resources at relatively shallow depths and within the mine plan presented in the 2025 Preliminary Economic Assessment of the Project. Additional drill targets in this area will be an important part of the work program planned for 2026. The sixth hole published today, OB-25-377, was located in a gap area between the west and east sides of the old mine and intersected three narrow zones of minor mineralization.
Matt Manson, President and CEO 416-618-5885 mmanson@radissonmining.com
Hubert Parent-Bouchard, Chief Financial Officer 819-763-9969 hpbouchard@radissonmining.com
Source: Ressources minières Radisson Inc.
