RDS.V · 2026-09-02 12:00:00

Radisson Continues to Intersect High-Grade Gold Mineralization in the "Trend 1-Trend 2 Gap" at O'Brien, Including 52.34 g/t Gold over 3 Metres

Drill Results

Radisson Continues to Intersect High-Grade

Gold Mineralization in the "Trend 1-Trend 2

Gap" at O'Brien, Including 52.34 g/t Gold over

3 Metres

Rouyn-Noranda, Quebec--(Newsfile Corp. - September 2, 2026) -

Radisson Mining Resources Inc.

(TSXV: RDS) (OTCQX: RMRDF)

Radisson

" or the "

Company

") is pleased to announce the results

of six new drill holes recently completed at its 100%-owned O'Brien Gold Project ("

O'Brien

" or the

Project

") located in the Abitibi region of Québec. The six holes represent new wedge branches

targeting the "

Trend 1-Trend 2 Gap

", an area of little previous drilling extending over an approximate

800-metre vertical extent in the central portion of the Project. All have returned significant intercepts of

high-grade gold mineralization. This follows a pattern developed in recently published results in the same

area (see news releases dated

June 1, 2026

June 22, 2026

, and

July 7, 2026

), with important

implications for future mineral resources. These results are the latest from the Company's ongoing

140,000-metre step-out drill program and continue to extend the scope of gold mineralization beyond the

Company's March 2026 Mineral Resource Estimate ("

MRE

"). Highlights (Figure 1 and Table 1) include:

OB-26-386W4

intersected 52.34 grams per tonne ("g/t") gold ("Au") over 3.0 metres (core lengths)

including 154.95 g/t Au over 1.0 metre,

and

3.82 g/t Au over 10.2 metres including 9.98 g/t Au over

3.0 metres,

and

9.39 g/t Au over 2.0 metres including 11.50 g/t Au over 1.0 metre;

OB-26-387W7

intersected 10.62 g/t Au over 4.7 metres including 40.90 g/t Au over 1.1 metres,

and

29.34 g/t Au over 1.0 metre,

and

6.43 g/t Au over 3.0 metres including 8.20 g/t Au over 2.0

metres;

OB-26-386W5

intersected 5.37 g/t Au over 4.2 metres including 14.38 g/t Au over 1.2 metres;

OB-26-386W6

intersected 6.14 g/t Au over 3.7 metres including 11.11 g/t Au over 1.0 metre.

Matt Manson, President and CEO: "We have now released results from two pilot holes and thirteen

directional wedge branches in the "Trend 1-Trend 2 Gap", previously a large hole in our drill

coverage extending over 800 metres vertically in the centre of the deposit. Thirteen of these fifteen

holes have intersected mineralization with grades and thicknesses consistent with the Project's

mineral resources. In many cases, as with today's news, we have intersected multiple, parallel

zones of mineralization with very high grades. Previous drilling at O'Brien has defined steeply

plunging mineralization "Trends" separated by "Gaps", a pattern that defines the character of our

mineral resource block model and influences our exploration targeting and conceptual mine

design. We now know that the gap between Trend #1 and Trend #2, at least, is a function of

insufficient drilling. Gold mineralization appears laterally continuous across this area. This has

important implications for mineral resource growth and may positively influence future

development scenarios such as stope continuity in a potential mine and the location of future

mining infrastructure such as drifts and ramps. All of this gap drilling has been achieved from just

two drill rigs successfully completing multiple wedge branches over a broad area from two pilot

holes (OB-26-386 and 387). A total of eight drill rigs are currently active at the Project as part of the

ongoing 140,000-metre step-out drill program focused exclusively on mineral resource growth.

This drilling will run concurrently with the recently announced advanced underground exploration

program (see news release dated

August 24, 2026

). These parallel, fully-funded programs offer

substantial progress on both the exploration of the Project and its development path."

Figure 1

: Longitudinal Vertical Section and Plan View of Gold Vein Mineralization and Mineral

Resources at the O'Brien Gold Project, with Today's Drill Holes Illustrated

To view an enhanced version of this graphic, please visit:

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Gold Mineralization at O'Brien

Gold mineralizing quartz-sulphide veins at O'Brien occur within a thin band of interlayered mafic volcanic

rocks, conglomerates, and porphyritic andesitic sills of the Piché Group occurring in contact with the

east-west oriented Larder Lake-Cadillac Break ("LLCB"). Gold, along with pyrite and arsenopyrite, is

typically associated with shearing and a pervasive biotite alteration, and developed within multiple Piché

Group lithologies and, occasionally, the hanging-wall Pontiac and footwall Cadillac meta-sedimentary

rocks.

Table 1

: Assay Results Calculated at a 3 g/t Au Bottom Cut-Off from Drill Holes Published Today

To view an enhanced version of this graphic, please visit:

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Notes on Calculation of Drill Intercepts:

The O'Brien Gold Project Mineral Resource Estimate effective January 31, 2026 utilizes a 2.20 g/t Au bottom cut-off, a US$2,500 gold price, a

minimum mining width of 1.2 metres, and a 60 g/t Au upper cap on individual assays. Intercepts presented in Table 1 are calculated with a 3.00 g/t

Au bottom cut-off.

Sample grades are uncapped. True widths, based on depth of intercept and drill hole inclination, are estimated to be 30-80% of

core length. Table 3 presents additional drill intercepts calculated with a 1.00 g/t Au bottom cut-off over a minimum 1.0 metre core length so as to

illustrate the frequency and continuity of mineralized intervals within which high-grade gold veins at O'Brien are developed. Lithology Codes: PON-

S3: Pontiac Sediments; V3-S, V3-N, V3-CEN: Basalt-South, North, Central; S1P, S3P: Conglomerate and Greywackes; POR-S, POR-N: Porphyry

South, North; TX: Crystal Tuff; ZFLLC: Larder Lake-Cadillac Fault Zone

As mapped at the historic O'Brien mine, and now replicated in the modern drilling, individual veins are

generally narrow, ranging from several centimetres up to several metres in thickness and areassociated

with broader, mineralized alteration envelopes. Multiple veins occur sub-parallel to each other, as well as

sub-parallel to the Piché lithologies and the LLCB. Individual veins have well-established lateral

continuity, with steeply plunging grade shoots developed over significant lengths.

The historic O'Brien mine produced over half a million ounces of gold from such veins and shoots at an

average grade exceeding 15 g/t Au and over a vertical extent of at least 1,000 metres. Modern

exploration has focussed on delineating well-developed vein mineralization below and to the east of the

historic mine. Based on the historic data available, it is clear that the former mine was "high-graded",

with mining focussed on a main central stope and parallel veins identified but left undeveloped.

Figure 2

: The "Trend 1-Trend 2 Gap" Illustrated on the Basis of the March 2026 MRE (left) and the July

2025 PEA Mine Design (Right). This Graphic Also Illustrates the Growth in the Project's MRE since the

July 2025 PEA was Completed.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/10977/312483_05a0c8bbc479e801_003full.jpg

Step-Out Drilling at O'Brien

Since the end of 2024, Radisson has been pursuing a program of broad step-outs beneath the historic

O'Brien Gold mine and the existing mineral resources designed to test the extent of gold mineralization

at the Project. This drilling is accomplished with pilot holes followed by wedges and directional drilling to

maximize drill efficiency and minimize costs. In October 2025, Radisson announced the expansion of the

step-out drill program to 140,000 metres employing eight drill rigs (see

Radisson news release dated

October 16, 2025

The origin of the step-out drill program was the deep pilot hole OB-24-337, which was the first

exploration drill hole located below the former mine workings since mining ended in 1957. This hole

intersected 31.24 g/t Au over 8.0 metres, including 242.0 g/t Au over 1.0 m at approximately 1,500

metres vertical depth (see

Radisson news release dated December 16, 2024

). Fifteen wedge branches

were completed from OB-24-337 delineating up to eight gold-bearing veins over a 250-metre by 700-

metre area in what is referred to as "O'Brien Mine East" (see

Radisson news release dated February

12, 2026

). In March 2026, Radisson published an interim update in the Project's mineral resources,

showing meaningful growth based on the on-going drilling (see

Radisson news release dated March 2,

2026

The focus of the step-out drill program has been the extension of mineralization at depth, with an

exploration floor of 2 kilometres depth, and recently announced plans to extend this drilling to 2.5

kilometres depth (see

Radisson news release dated May 28, 2026

). Given the character of neighbouring

gold deposits and the wealth of mining infrastructure within or close to the O'Brien Gold Project,

Radisson believes that significant exploration potential exists to these depths, and such mineralization

might reasonably be expected to be developed.

Figure 3

: Vertical Section Through "Trend 1 - Trend 2 Gap" with Today's New Drill Results

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/10977/312483_05a0c8bbc479e801_004full.jpg

In addition to the progressively deeper drilling, the 140,000-metre program includes targeting of areas

within the O'Brien geological model that have not previously been tested and offer the potential for

additional mineral resources at shallower depths. As exploration drilling at O'Brien has progressed over

the last several years, high-grade intercepts and vein delineations have typically been followed up with

additional drilling on steep east plunging trends. This is consistent with the observation of steeply

plunging high-grade shoots in the historical O'Brien mine, from surface trenching, and from the

orientation of grade trends in the MRE. This exploration strategy has resulted in a number of large-scale

mineralization "Trends 0 to 5" being delineated, with intervening "gaps". These gaps are typically

defined by a lack of drilling rather than a lack of mineralization. Significant gaps include between the

former mine and "Trend 0", and a gap of 800 metres vertical extent between "Trends 1 and 2" (Figure 1

and Figure 2).

Figure 4:

Deep Step-Out Drill Holes Completed and/or Published by the Company Since March 2026

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/10977/312483_05a0c8bbc479e801_005full.jpg

Pilot holes OB-26-386 and OB-26-387 were established to target the Trend 1-Trend 2 Gap at

approximately 500 and 1,000 metres vertical depth. Thirteen directional wedge branches have now been

completed from the two pilot holes for a total of fifteen cuts through the Piché Group. All of these drill

holes have returned intercepts of gold mineralization in the characteristic quartz-sulphide-gold veins and

alteration envelops developed within the conglomerate, porphyry and volcanic units of the Piché Group

(Figure 3). Thirteen of the fifteen have returned intercepts with grades and thicknesses consistent with

the Project's mineral resources. Selected highlights of these fifteen holes now include:

OB-26-386W1

intersected 3.43 g/t Au over 13.4 metres including 8.63 g/t Au over 1.0 metres

and

including

10.26 g/t Au over 1.0 metres

and including

8.24 g/t Au over 1.0 metres;

OB-26-386W4

intersected 52.34 g/t Au over 3.0 metres including 154.95 g/t Au over 1.0 metre,

and

3.82 g/t Au over 10.2 metres including 9.98 g/t Au over 3.0 metres,

and

9.39 g/t Au over 2.0

metres including 11.50 g/t Au over 1.0 metre;

OB-26-387W2

intersected 7.57 g/t Au over 9.7 metres including 52.75 g/t Au over 1.1 metre;

OB-26-387W3

intersected 66.93 g/t Au over 1.0 metres and 24.97 g/t Au over 1.0 metres;

OB-26-387W7

intersected 10.62 g/t Au over 4.7 metres including 40.90 g/t Au over 1.1 metres,

and

29.34 g/t Au over 1.0 metre,

and

6.43 g/t Au over 3.0 metres including 8.20 g/t Au over 2.0

metres.

These results demonstrate that continuity of mineralization at O'Brien can be established laterally

between what were previously thought to be discrete mineralization trends. In addition, the presence of a

gap in the mineral resource block model between Trends 1 and 2 drives a gap between mining areas

and mine infrastructure planning, as was demonstrated in the mine design contained within Radisson's

July 2025 Preliminary Economic Assessment ("

PEA

") for the Project (Figure 2). Additional mineral

resources in these under-drilled gaps will also benefit the density of mineralization at the Project, which

is a common measure of economic viability and capital efficiency in underground mine design.

The six new drill holes at the Project continue to demonstrate the very high incidence of intercepts with

grades and thicknesses consistent with the Project's mineral resources ("hits", per Table 2). This now

stands at 82% of all drill holes completed to date, an impressive result for a step-out drill program

specifically targeting non-resource areas (Figure 4). Mineralization remains open in every direction, with

clear opportunities to expand the quantity of new mineral resources, in particular by drilling at depth.

Table 2

: Drill Results Published for the O'Brien Gold Project Since December 2024

Date of Publication

Total Number of

Drill Holes

Drill Holes with

Intercepts >+3g/t

Success

Rate (%)

September 2, 2026

100%

July 7, 2026

100%

June 22, 2026-O'Brien

100%

June 22, 2026-Thompson-Cadillac

50%

June 1, 2026

86%

April 30, 2026-O'Brien

100%

April 30, 2026-Thompson-Cadillac

22%

January 27, 2026

100%

January 6, 2026

83%

October 28, 2025

87%

September 8, 2025

87%

July 16, 2025

79%

April 2, 2025

100%

February 26, 2025

75%

December 16, 2024

100%

Total

120

82%

Table 3

: Detailed Assay Results (see "Notes on Calculation of Drill Intercepts")

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/10977/312483_rad2.jpg

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