Radisson Reports Highest Grade Drill Intercepts Achieved to Date Beneath the Historic O'Brien Gold Mine Including 89.36 g/t Gold over 3.7 Metres and 60.75 g/t Gold over 2.1 Metres
Radisson Reports Highest Grade Drill
Intercepts Achieved to Date Beneath the
Historic O'Brien Gold Mine Including 89.36 g/t
Gold over 3.7 Metres and 60.75 g/t Gold over
2.1 Metres
Rouyn-Noranda, Quebec--(Newsfile Corp. - July 16, 2025) -
Radisson Mining Resources Inc. (TSXV:
RDS) (OTCQB: RMRDF)
("
Radisson
" or the "
Company
") is pleased to announce assay results from
new drill holes completed at its 100%-owned O'Brien Gold Project ("
O'Brien
" or the "
Project
") located
in the Abitibi region of Québec.
Four of the drill holes reported today are wedges completed from the previously reported pilot hole
OB-
24-337
, the deepest hole ever drilled at the Project and the first drilled directly below the historic O'Brien
Mine workings. This pilot hole, and the first three wedge-extensions drilled from it (
OB-24-337W1 to W3
)
all returned multiple, high-grade gold intercepts, delineating a large zone of gold-bearing veins with good
continuity (see
Radisson News Release dated April 2, 2025
). Now, an additional four wedges (
OB-25-
337W4 to W7
) demonstrate the scale of this zone with the highest-grade intercepts yet achieved.
Highlights include:
OB-25-337W7
intersected 89.36 grams per tonne ("g/t") gold ("Au") over 3.7 metres, including
293.0 g/t Au over 1.1 metres
and
16.43 g/t Au over 8.1 metres, including 60.75 g/t Au over 2.1
metres
and
9.69 g/t Au over 1.3 metres;
OB-25-337W5
intersected 47.70 g/t Au over 1.0 metres and 5.25 g/t Au over 4.0 metres, including
17.90 over 1.0 metres;
OB-25-337W6
intersected 6.45 g/t Au over 3.5 metres, including 18.80 g/t Au over 1.0 metres and
3.57 g/t Au over 12.0 metres, including 6.51 g/t Au over 1.0 metre
and
3.70 g/t Au over 4.4 metres,
including 7.11 g/t Au over 1.5 metres.
Radisson is also reporting, today, results from ten shallower holes drilled adjacent to the historic mine
workings on "Trend #0", including drill holes in and around the former "Jewellery Box" zone (see
Radisson News Release dated December 9, 2024
). Recall that drill hole OB-24-347 returned 643.1 g/t
Au over 2.1 metres, including 1,345.0 g/t Au over 1.0 metres on what is interpreted to be the near
surface upwards extension of the famous high-grade and narrow mining stope. Highlights include:
OB-25-370
intersected 4.32 g/t Au over 6.5 metres, including 10.49 g/t Au over 2.1 metres;
OB-25-372
intersected 7.05 g/t Au over 2.5 metres, including 15.95 over 1.0 metre.
Figure 1
: Long 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:
https://images.newsfilecorp.com/files/10977/258964_687895dcb47bdb14_002full.jpg
Matt Manson, President & CEO, commented:
"Since last December, we have been reporting the
delineation of a series of high-grade gold-bearing veins developed over a large area up to 500 metres
below the base of the historic O'Brien Gold Mine. In today's news release we are reporting the highest-
grade intercepts returned to date from this area, with the results of four new wedges drilled from our
initial pilot hole. We are now delineating up to six mineralized zones over hundreds of metres, which
appear related to mapped veins at the base of the former mine and which are outside the scope of
conceptual mine plan contained in our recently reported Preliminary Economic Assessment (see
Radisson News Release dated July 9, 2025
). A priority of our ongoing 50-60,000 metre drill program
at O'Brien is large step outs below the current mineral resources and the historic mine in a 'proof-of-
concept' approach to test the potential extension of the O'Brien mineralizing system to 2 kilometres
depth. To date, this strategy has been remarkably successful, with important implications for the future
scale of the Project."
Matt Manson continued:
"We are also reporting today several shallower drill holes targeting the surface
projection of the famous "Jewellery Box Zone", rediscovered by Radisson with bonanza grades late
last year, as well as the downward extension of our mineral resource block model on "Trend #0"
adjacent to the Jewellery Box stope. Both target areas have returned high-grade intercepts,
demonstrating extensive gold mineralization in and around this target area."
Table 1
: Assay Results from Drill Holes OB-24-356 to OB-25-374 and OB-25-337W4 to W7
DDH
Zone
From (m)
To (m)
Core Length (m)
Au g/t - Uncut
Host Lithology
OB-25-337W4
O'Brien Mine
1,474.2
1,475.5
1.3
3.44
POR-S
1,484.7
1,491.3
6.7
3.34
V3-CEN
Including
1,484.7
1,486.0
1.4
5.04
V3-CEN
1,489.8
1,491.3
1.5
6.70
V3-CEN
1,524.2
1,525.4
1.2
3.01
S1p
1,533.2
1,534.4
1.2
4.62
S1p
OB-25-337W5
O'Brien Mine
1,389.7
1,390.7
1.0
3.30
V3-S
1,427.5
1,428.5
1.0
47.70
V3-CEN
1,436.0
1,437.0
1.0
3.01
V3-CEN
1,440.0
1,441.0
1.0
5.32
V3-CEN
1,524.0
1,528.0
4.0
5.25
S3p
Including
1,525.0
1,526.0
1.0
17.90
S3p
OB-25-337W6
O'Brien Mine
1,488.5
1,492.0
3.5
6.45
POR-S
Including
1,489.6
1,490.6
1.0
18.80
POR-S
1,570.0
1,582.0
12.0
3.57
S1p
Including
1,570.0
1,571.0
1.0
6.51
S1p
1,635.5
1,639.0
3.5
4.30
V3-N
Including
1,637.0
1,638.0
1.0
6.96
V3-N
1,644.6
1,649.0
4.4
3.70
V3-N
Including
1,646.0
1,647.5
1.5
7.11
V3-N
OB-25-337W7
O'Brien Mine
1,430.6
1,438.7
8.1
16.43
POR-S/V3-CEN
Including
1,433.3
1,434.3
2.1
60.75
POR-S
1,475.2
1,478.9
3.7
89.36
S1p
Including
1,476.3
1,477.4
1.1
293.00
S1p
1,502.7
1,504.0
1.3
3.18
V3-N
1,547.7
1,549.0
1.3
9.69
S3p
OB-24-356
Trend #0
167.5
173.5
6.0
3.08
S1P
Including
172.0
173.5
1.5
8.20
S1P
OB-24-357
Trend #0
456.3
457.4
1.1
6.03
S1P
517.5
518.5
1.0
6.16
S3P
OB-24-360
Trend #0
499.0
500.0
1.0
8.51
V3-CEN
OB-25-367
Trend #0
108.6
110.5
1.9
4.65
V3-S
OB-25-370
Trend #0
169.0
175.5
6.5
4.32
V3-CEN
Including
169.0
171.1
2.1
10.49
V3-CEN
215.0
216.0
1.0
3.17
S1p/TX
OB-25-372
Trend #0
170.0
172.5
2.5
7.05
V3-CEN
Including
170.0
171.0
1.0
15.95
V3-CEN
OB-25-374
Trend #0
262.0
263.0
1.0
4.41
TX
Notes on Calculation of Drill Intercepts:
The O'Brien Gold Project Mineral Resource Estimate Published on July 9, 2025 ("MRE") utilizes a 2.20 g/t Au bottom cut-off, a US$2,000 gold
price, a minimum mining width of 1.2 metres, and a 40 g/t Au upper cap on composites. 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 2 presents additional drill intercepts calculated with a 1.00 g/t 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; POR-S, POR-N: Porphyry South, North; TX:
Crystal Tuff; ZFLLC: Larder-Lake-Cadillac Fault Zone.
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.
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. 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 near-vertical, high-grade shoots developed over
significant lengths. 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.
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 to the east of the historic
mine, with additional high-grade shoots becoming evident in the exploration data over what has been
described as a series of repeating trends ("Trend #s 0 to 5").
Since the end of 2024, Radisson has been delineating a series of high-grade veins beneath the historic
workings of the O'Brien mine with a series of wedge-extensions drilled from the pilot hole OB-24-337,
which intersected 242.0 g/t Au over 1.0 metre within a mineralized interval that averaged 31.24 g/t Au
over 8.0 metres at approximately 1,500 metres vertical depth. With today's news release, assay results
from a total of 7 wedges have now been reported and up to six gold-bearing veins have been delineated
over an area of approximately 250 metres (east-west) by 250 metres (vertical). These veins appear to
correspond to veins mapped at the base of the historic mine at 1,000 metres deep, approximately 300
to 500 metres above the new intercepts.
Radisson's vein modelling is undertaken dynamically as drilling proceeds and is used to guide future
exploration and, ultimately, domaining for future resource estimation. Beneath the historic mine, vein V3-
S_20 intersects OB-24-337W2, W3 and W7 and is further supported by underground mapping in an
exploration drift located to the south of the main mined out vein at level 3450 (feet). Vein V3-C_03 is
intersected by the pilot hole and all seven wedges and is further supported by underground mapping and
the historic stope locations. Vein V3-N_02 is intersected by the pilot hole and all seven wedges and is
further supported by historic underground drilling from the 3450 level. V3-N_03 is intersected by all
seven wedges. With the new drill holes published today, two new veins have been added to this
developing model: POR_S-14 intersected by the pilot hole plus three wedges, and CONG_15 which is
intersected by wedges W2, W4, W6 and W7.
Based on drilling complete to the end of 2022, and a recently published Preliminary Economic
Assessment for the Project (see
Radisson news Release dated July 9, 2025
) the Project has estimated
Indicated Mineral Resources of 0.58 million ounces (2.20 million tonnes at 8.2 g/t Au), with additional
Inferred Mineral Resources of 0.93 million ounces (6.67 million tonnes at 4.4 g/t Au). Mineral Resources
that are not Mineral Reserves do not have demonstrated economic viability.
QA/QC
All drill cores in this campaign are NQ in size. Assays were completed on sawn half-cores, with the
second half kept for future reference. The samples were analyzed using standard fire assay procedures
with Atomic Absorption (AA) finish at ALS Laboratory Ltd, in Val-d'Or, Quebec. Samples yielding a
grade higher than 10 g/t Au were analyzed a second time by fire assay with gravimetric finish at the
same laboratory. Mineralized zones containing visible gold were analyzed with metallic sieve procedure.
Standard reference materials, blank samples and duplicates were inserted prior to shipment for quality
assurance and quality control (QA/QC) program.
Qualified Persons
Disclosure of a scientific or technical nature in this news release was prepared under the supervision of
Mr. Richard Nieminen, P.Geo, (QC), a geological consultant for Radisson and a Qualified Person for
purposes of NI 43-101. Mr. Luke Evans, M.Sc., P.Eng., ing, of SLR Consulting (Canada) Ltd., is the
Qualified Person responsible for the preparation of the MRE at O'Brien. Each of Mr. Nieminen and Mr.
Evans is independent of Radisson and the O'Brien Gold Project.
About Radisson Mining
Radisson is a gold exploration company focused on its 100% owned O'Brien Gold Project, located in the
Bousquet-Cadillac mining camp along the world-renowned Larder-Lake-Cadillac Break in Abitibi,
Québec. A July 2025 Preliminary Economic Assessment described a low cost and high value project
with an 11-year mine life and significant upside potential based on the use of existing regional
infrastructure. Indicated Mineral Resources are estimated at 0.58 million ounces (2.20 million tonnes at
8.2 g/t Au), with additional Inferred Mineral Resources estimated at 0.93 million ounces (6.67 million
tonnes at 4.4 g/t Au). Please see the NI 43-101 "Technical Report on the O'Brien Project, Northwestern
Québec, Canada" effective March 2, 2023 and other filings made with Canadian securities regulatory
authorities available at
www.sedarplus.ca
for further details and assumptions relating to the O'Brien Gold
Project.
Figure 2
: Cross Section through the O'Brien mine including drill holes OB-24-337, and W1-W7
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10977/258964_687895dcb47bdb14_006full.jpg
Figure 3
: Vein Modelling Across Drill Holes OB-25-337, and W1-W7
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10977/258964_687895dcb47bdb14_007full.jpg
Table 2
: Detailed Assay Results (see "Notes on Calculation of Drill Intercepts")
DDH
Zone
From (m)
To (m)
Core Length (m)
Au g/t - Uncut
Host Lithology
OB-25-337W4
O'Brien Mine
1,462.7
1,464.2
1.5
1.30
POR-S
1,468.8
1,475.5
6.7
1.77
POR-S
Including
1,474.2
1,475.5
1.3
3.44
POR-S
1,482.0
1,483.3
1.3
1.66
V3-CEN
1,484.7
1,491.3
6.7
3.34
V3-CEN
Including
1,484.7
1,486.0
1.4
5.04
V3-CEN
Including
1,489.8
1,491.3
1.5
6.70
V3-CEN
1,524.2
1,534.4
10.2
2.27
S1p
Including
1,524.2
1,525.4
1.2
3.01
S1p
Including
1,533.2
1,534.4
1.2
4.62
S1p
1,549.1
1,550.1
1.0
1.82
POR-N
1,578.0
1,579.0
1.0
2.56
V3-N
1,585.0
1,586.5
1.5
1.48
V3-N
1,609.5
1,612.3
2.8
1.24
S3p
OB-25-337W5
O'Brien Mine
1,368.0
1,369.5
1.5
1.59
V3-S
1,371.0
1,373.0
2.0
1.05
V3-S
1,389.7
1,391.7
2.0
2.98
V3-S
Including
1,389.7
1,390.7
1.0
3.30
V3-S
1,401.5
1,403.0
1.5
1.56
POR-S
1,412.0
1,413.5
1.5
2.05
POR-S
1,422.0
1,423.0
1.0
2.02
V3-CEN
1,427.5
1,428.5
1.0
47.70
V3-CEN
1,436.0
1,437.0
1.0
3.01
V3-CEN
1,440.0
1,441.0
1.0
5.32
V3-CEN
1,456.0
1,458.0
2.0
1.22
S1p
1,461.5
1,462.5
1.0
2.18
S1p
1,490.2
1,492.3
2.1
1.99
V3-N
1,509.5
1,510.5
1.0
1.78
V3-N
1,524.0
1,528.0
4.0
5.25
S3p
Including
1,525.0
1,526.0
1.0
17.90
S3p
OB-25-337W6
O'Brien Mine
1,090.0
1,091.0
1.0
1.12
PON-S3
1,246.5
1,248.0
1.5
1.36
PON-S3
1,479.0
1,480.5
1.5
1.42
POR-S
1,485.0
1,486.5
1.5
1.76
POR-S
1,488.5
1,492.0
3.5
6.45
POR-S
Including
1,489.6
1,490.6
1.0
18.80
POR-S
1,508.0
1,509.5
1.5
1.22
POR-S
1,516.5
1,518.0
1.5
1.81
POR-S
1,570.0
1,582.0
12.0
3.57
S1p
Including
1,570.0
1,571.0
1.0
6.51
S1p
1,585.0
1,588.0
3.0
1.95
S1p
1,620.0
1,622.8
2.8
1.88
V3-N
1,635.5
1,639.0
3.5
4.30
V3-N
Including
1,637.0
1,638.0
1.0
6.96
V3-N
1,642.0
1,643.5
1.5
1.69
V3-N
1,644.6
1,649.0
4.4
3.70
V3-N
Including
1,646.0
1,647.5
1.5
7.11
V3-N
1,650.5
1,654.0
3.5
1.30
V3-N
OB-25-337W7
O'Brien Mine
1,430.6
1,438.7
8.1
16.43
POR-S/V3-CEN
Including
1,433.3
1,434.3
2.1
60.75
POR-S
1,475.2
1,478.9
3.7
89.36
S1p
Including
1,476.3
1,477.4
1.1
293.00
S1p
1,502.7
1,504.0
1.3
3.18
V3-N
1,517.6
1,519.0
1.4
1.65
V3-N
1,547.7
1,549.0
1.3
9.69
S3p
OB-24-356
Trend #0
150.0
151.5
1.5
1.17
POR-S
167.5
173.5
6.0
3.08
S1P
Including
172.0
173.5
1.5
8.20
S1P
176.3
177.7
1.4
1.03
S1P
235.0
238.0
3.0
1.90
V3-N
244.0
245.5
1.5
2.47
V3-N
OB-24-357
Trend #0
456.3
457.4
1.1
6.03
S1P
467.0
468.0
1.0
1.44
S1P
477.0
478.0
1.0
1.08
S1P
479.5
480.8
1.3
1.29
S1P
517.5
518.5
1.0
6.16
S3P
OB-24-360
Trend #0
499.0
500.0
1.0
8.51
V3-CEN
507.5
508.5
1.0
1.52
S1P
522.0
524.0
2.0
2.23
S1P
OB-25-367
Trend #0
83.4
84.9
1.5
1.34
V3-S
108.6
110.5
1.9
4.65
V3-S
174.5
176.0
1.5
1.05
TX
187.5
190.2
2.7
1.29
V3-N
OB-25-368
Trend #0
81.0
82.2
1.2
2.00
PON-S3
117.9
125.8
7.9
1.16
POR-S/V3-CEN
182.0
183.0
1.0
1.03
V3-N
OB-25-369
Trend #0
158.6
160.1
1.5
1.54
S1p
162.8
163.8
1.0
1.35
TX
OB-25-370
Trend #0
111.5
113.0
1.5
1.47
PON-S3
163.2
164.2
1.0
2.26
V3-CEN
169.0
175.5
6.5
4.32
V3-CEN
Including
169.0
171.1
2.1
10.49
V3-CEN
215.0
219.0
4.0
2.14
S1p/TX
Including
215.0
216.0
1.0
3.17
S1p/TX
234.0
235.0
1.0
1.43
TX
OB-25-372
Trend #0
170.0
172.5
2.5
7.05
V3-CEN
Including
170.0
171.0
1.0
15.95
V3-CEN
201.0
202.3
1.3
1.84
S1p
251.0
253.0
2.0
1.41
V3-N
OB-25-373
Trend #0
182.0
185.5
3.5
2.19
V3-CEN
205.0
206.1
1.1
1.17
S1p
213.5
215.0
1.5
1.25
S1p
218.0
219.0
1.0
1.24
S1p
OB-25-374
Trend #0
77.0
78.3
1.3
1.10
PON-S3
140.7
142.2
1.5
1.56
PON-S3
251.0
252.0
1.0
1.40
S1p
262.0
263.0
1.0
4.41
TX
279.7
282.5
2.8
1.83
TX/V3-N
290.5
292.0
1.5
1.32
V3-N