Radisson Continues to Expand Scope of Gold Mineralization at O'Brien with Latest Drill Results
Radisson Continues to Expand Scope of Gold
Mineralization at O'Brien with Latest Drill
Results
Rouyn-Noranda, Quebec--(Newsfile Corp. - September 8, 2025) -
Radisson Mining Resources Inc.
(TSXV: RDS) (OTCQB: RMRDF)
("
Radisson
" or the "
Company
") is pleased to announce assay
results from fifteen new drill holes completed at its 100%-owned O'Brien Gold Project ("
O'Brien
" or the
"
Project
") located in the Abitibi region of Québec. The fifteen holes represent step-outs below the
existing geological model, east of the historic O'Brien Gold Mine (Figure 1) and are outside the scope of
the recently completed Preliminary Economic Assessment ("
PEA
", see
Radisson news release dated
July 9, 2025
). All holes intersected gold mineralization in characteristic quartz-sulphide-gold veins, and
thirteen of the holes returned intercepts with grades and thicknesses consistent with the Project's
existing mineral resources. These results continue to expand the scope of the Project's known gold
mineralization. Highlights include:
OB-24-363
intersected 8.41 grams per tonne ("g/t") gold ("Au") over 2.2 metres, including 14.40
g/t Au over 1.2 metres
and
9.07 g/t Au over 1.8 metres, including 12.10 g/t Au over 0.9 metres;
OB-24-354
intersected 7.95 g/t Au over 2.30 metres, including 14.85 g/t Au over 1.0 metre;
OB-24-364
intersected 12.75 g/t Au over 1.4 metres and 11.15 g/t Au over 1.50 metres;
OB-24-361
intersected 3.50 g/t Au over 5.0 metres, including 8.96 g/t Au over 1.28 metres,
and
15.10 g/t Au over 1.0 metre; and
OB-25-371W1
intersected 5.66 g/t Au over 3.0 metres, including 9.97 g/t Au over 1.5 metres.
Matt Manson, President & CEO, commented:
"Our ongoing drilling at the O'Brien Project is focussed
on "proof-of-concept" step-outs designed to test the full scope of the Project beyond previous drilling.
We recently released the latest results from drilling beneath the historic O'Brien gold mine where we
have been delineating multiple high-grade gold-bearing veins over a large area up to 500 metres
below the base of the historic workings. Today's news release shows results from drill holes located to
the east of the historic mine, and below the existing mineral resources. Of note, several of the holes
represent deep step-outs below our "Trend #2", pushing the scope of known mineralization downwards
by up to 300 metres in this important area. Our Exploration Target at O'Brien is between 3 and 4
million ounces of gold in 15 to 20 million tonnes at between 4.5 and 8.0 g/t Au. This is based on the
proposition that O'Brien's mesothermal gold mineralization continues to an exploration horizon of 2
kilometres depth. Today's results continue to support this thesis. With the recent completion of our
high-value, but "snap-shot", PEA, our focus is on aggressive exploration and resource growth. Four
rigs are currently active at the Project and drilling continues."
The reader is cautioned that the potential quantity and grade of an Exploration Target is conceptual in
nature, there has been insufficient exploration to define a mineral resource and that it is uncertain if
further exploration will result in the target being delineated as a mineral resource.
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/10977/265432_bb2e887f64ce98f8_001full.jpg
Table 1
: Assay Results from Drill Holes OB-24-352 to OB-25-375
DDH
Zone
From (m)
To (m)
Core Length (m)
Au g/t - Uncut
Host Lithology
OB-24-352
Trend #2
521.0
522.0
1.00
13.10
PON-S3
703.0
704.5
1.50
3.73
S1P
OB-24-353
Trend #1
70.0
71.5
1.50
3.51
PON-S3
160.9
162.0
1.14
3.24
S1P
191.0
194.3
3.30
3.70
TX
Including
192.0
193.0
1.00
6.28
TX
OB-24-354
Trend #0
232.0
234.3
2.3
7.9
S1P
Including
232.0
233.0
1.0
14.9
S1P
302.7
304.0
1.3
6.4
V3-N
OB-24-355
Trend #3
432.4
433.7
1.30
3.91
S1P
466.8
468.9
2.10
3.49
V3-N
OB-24-359W1
Trend #3
429.3
430.8
1.50
3.88
V3-S
495.0
496.0
1.00
11.20
S3P
OB-24-361
Trend #3
195.5
196.5
1.00
4.46
PON-S3
572.4
573.4
1.00
15.10
V3-S
633.0
638.0
5.00
3.50
V3-S
Including
633.0
634.3
1.28
8.96
S1P/POR-N
OB-24-363
Trend #2
194.5
195.9
1.40
6.04
PON-S3
910.0
911.0
1.00
7.65
PON-S3
1,199.7
1,201.9
2.20
8.41
V3-S
Including
1,200.7
1,201.9
1.20
14.40
V3-S
1,231.3
1,233.1
1.80
9.07
POR-S
Including
1,232.2
1,233.1
0.90
12.10
POR-S
OB-25-363W1
Trend #2
1,037.0
1,038.4
1.40
4.16
V3-S
1,056.5
1,058.0
1.50
4.04
V3-S
OB-24-364
Trend #1
388.0
389.4
1.40
12.75
V3-CEN
402.5
404.0
1.50
6.26
S1P
413.2
414.7
1.50
11.15
POR-N
OB-25-366
Trend #2
619.0
620.0
1.00
3.71
PON-S3
OB-25-371
Trend #2
1,402.0
1,404.5
2.50
3.99
POR-S
Including
1,402.0
1,403.0
1.00
5.54
POR-N/V3-N
OB-25-371W1
Trend #2
1,058.5
1,061.5
3.00
5.66
PON-S3
Including
1,058.5
1,060.0
1.50
9.97
PON-S3
1,210.9
1,214.0
3.10
3.21
V3-S
OB-25-375
Trend #3
538.0
539.5
1.50
7.38
S3p
Notes on Calculation of Drill Intercepts:
The O'Brien Gold Project Mineral Resource Estimate effective May 6, 2025 ("MRE") utilizes a 2.20 g/t Au bottom cutoff, 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. 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.
O'Brien Mineral Resource Estimates
The Mineral Resource Estimate ("
MRE
") utilized in the recent O'Brien PEA comprises Indicated Mineral
Resources of 0.58 million ounces (2.20 million tonnes at 8.2 g/t Au) and Inferred Mineral Resources of
0.93 million ounces (6.67 million tonnes at 4.4 g/t Au)
1
. Mineral Resources that are not Mineral Reserves
do not have demonstrated economic viability. This MRE, effective as of May 6, 2025, is based on the
Project's March 2023 estimate re-blocked with an updated cut-off yielding more ounces and more
tonnes at a lower average grade. As such, it is based on drilling completed only to the end of 2022. By
the end of the current fully funded 50-60,000 drill program, an additional 90-100,000 metres of drilling will
be available for an updated estimate, including a significant meterage of drilling outside the scope of the
current MRE and the recent PEA mine design.
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").
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 scope of mineralization at the
Project. This drilling is accomplished with pilot holes followed by wedges and directional drilling to
maximize drill efficiency. A particular focus has been the delineation of multiple high-grade veins beneath
the historic mine 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. Assay results from
a total of 7 wedges from OB-24-337 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 (see
Radisson news release dated July 16,
2025
). Current drilling in this area is focussed on infilling with pilot holes and wedge extensions both
above and below the OB-24-337 pattern of branches to test the full continuity of mineralisation from the
historic mine down to 2 kilometres depth.
Step-out drilling with wedge extensions has also confirmed high-grade mineralization 170 metres below
the base of the existing mineral resources at Trend #1, including pilot hole OB-24-324 which intersected
27.61 g/t Au over 6.0 metres (see
Radisson news release dated October 30, 2024
).
Today's results include pilot holes and wedges with high-grade mineralization located up to 300 metres
below previous drill intercepts at Trend #2 and showing good continuity with the mineral resource model
above (Figure 2). These drill holes include OB-24-363 which intersected 8.41 g/t Au over 2.20 metres
including 14.40 g/t Au over 1.20 metres and 9.07 g/t Au over 1.80 metres including 12.10 g/t Au over
0.90 metres. Three separate drill-holes were located at or close to the base of the existing mineral
resources at Trend #3, including OB-24-361 which intersected 15.10 g/t Au over 1 metre and 3.50 g/t Au
over 5.0 metres including 8.96 g/t Au over 1.28 metres. These new drill intercepts extend the scope of
known gold mineralization at O'Brien, which remains open to depth along the full 5 kilometre length of the
property.
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 "O'Brien Gold Project Technical Report and Preliminary
Economic Assessment, Québec, Canada" effective June 27, 2025, 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 "Trend #2" with Drill Holes OB-24-352,363, OB-25-363W1,371 and
371W1
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10977/265432_bb2e887f64ce98f8_002full.jpg
Table 2
: Detailed Assay Results (see "Notes on Calculation of Drill Intercepts")
DDH
Zone
From (m)
To (m)
CorG LGngth (m)
Au g/t - Uncut
Host Lithology
248.0
249.0
1.00
1.17
PON-S3
OB-24-352
Trend #2
521.0
522.0
1.00
13.10
PON-S3
648.0
649.5
1.50
1.46
V3-S
694.7
697.5
2.80
1.79
V3-CEN
703.0
704.5
1.50
3.73
S1P
724.1
725.5
1.40
1.32
POR-S
OB-24-353
Trend #1
26.5
28.0
1.50
2.24
PON-S3
58.7
61.0
2.30
2.05
PON-S3
70.0
71.5
1.50
3.51
PON-S3
134.5
135.9
1.40
1.90
V3-S
153.1
156.0
2.90
1.09
POR-S
160.9
162.0
1.14
3.24
S1P
165.5
166.5
1.00
1.13
S1P
180.9
181.9
1.04
1.98
S1P
184.4
185.7
1.29
1.15
POR-N
191.0
194.3
3.30
3.70
TX
Including
192.0
193.0
1.00
6.28
TX
197.0
198.0
1.00
2.11
V3-N
203.7
204.5
0.82
2.30
V3-N
OB-24-354
Trend #0
203.0
203.9
0.90
1.51
POR-S
232.0
234.3
2.30
7.95
S1P
Including
232.0
233.0
1.00
14.85
S1P
244.0
245.3
1.30
1.61
S1P
250.0
251.0
1.00
1.14
S1P
264.5
265.6
1.13
1.21
S1P
279.7
282.0
2.30
1.68
TX
302.7
304.0
1.30
6.39
V3-N
OB-24-355
Trend #3
308.6
309.7
1.10
1.04
PON-S3
401.5
403.0
1.50
1.09
V3-S
432.4
437.7
1.59
1.59
S1P
Including
432.4
433.7
1.30
3.91
S1P
440.9
442.0
1.10
1.87
V3-N
466.8
468.9
2.10
3.49
V3-N
473.2
474.2
1.00
1.18
V3-N
OB-24-359W1
Trend #3
429.3
430.8
1.50
3.88
V3-S
465.3
466.3
1.00
1.69
S1P
495.0
496.0
1.00
11.20
S3P
OB-24-361
Trend #3
195.5
196.5
1.00
4.46
PON-S3
215.5
216.5
1.00
2.01
PON-S4
413.0
414.1
1.10
1.34
PON-S5
481.5
483.0
1.50
1.05
PON-S6
514.0
515.5
1.50
1.09
V3-S
572.4
573.4
1.00
15.10
V3-S
633.0
638.0
5.00
3.50
V3-S
Including
633.0
634.3
1.28
8.96
S1P/POR-N
639.0
642.3
3.30
1.43
S1P
OB-24-362
Trend #1
432.2
433.5
1.25
2.16
POR-N
444.5
446.0
1.50
1.70
TX
OB-24-363
Trend #2
194.5
195.9
1.40
6.04
PON-S3
907.7
909.0
1.30
1.03
PON-S3
910.0
911.0
1.00
7.65
PON-S3
1,199.7
1,201.9
2.20
8.41
V3-S
Including
1,200.7
1,201.9
1.20
14.40
V3-S
1,215.2
1,216.4
1.20
1.42
V3-S
1,231.3
1,233.1
1.80
9.07
POR-S
Including
1,232.2
1,233.1
0.90
12.10
POR-S
1,286.5
1,287.5
1.00
2.91
V3-N
OB-25-363W1
Trend #2
877.0
878.3
1.30
1.43
TX
910.6
912.1
1.50
1.59
PON-S3
1,034.0
1,035.0
1.00
1.02
PON-S3
1,037.0
1,038.4
1.40
4.16
V3-S
1,042.6
1,044.0
1.40
1.93
V3-S
1,045.7
1,046.7
1.00
2.17
V3-S
1,052.6
1,059.3
6.70
1.78
V3-S
Including
1,056.5
1,058.0
1.50
4.04
V3-S
1,186.0
1,187.5
1.50
2.10
V3-S
OB-24-364
Trend #1
164.0
165.5
1.50
1.41
PON-S3
371.0
376.5
5.50
1.01
POR-S
388.0
389.4
1.40
12.75
V3-CEN
402.5
404.0
1.50
6.26
S1P
408.5
409.9
1.40
1.40
S1P
413.2
414.7
1.50
11.15
POR-N
440.7
442.0
1.30
2.32
V3-N
OB-25-365
Trend #1
379.0
380.5
1.50
1.40
V3-S
428.5
429.7
1.20
2.85
POR-S
OB-25-365
Trend #1
469.0
473.5
4.50
1.28
POR-N
502.5
504.0
1.50
1.35
S3p
OB-25-366
Trend #3
601.0
602.5
1.50
1.34
PON-S3
619.0
620.0
1.00
3.71
PON-S3
811.9
818.1
6.25
1.21
V3-CEN/S1p/POR-
N
OB-25-371
Trend #2
1,306.0
1,307.5
1.50
1.86
V3-N
1,310.5
1,312.0
1.50
1.36
S3p
1,326.0
1,327.0
1.00
1.48
V3-S
1,335.0
1,338.0
3.00
1.67
V3-S
1,370.5
1,375.2
4.70
1.07
POR-S
1,402.0
1,404.5
2.50
3.99
POR-S
Including
1,402.0
1,403.0
1.00
5.54
POR-N/V3-N
1,405.5
1,406.5
1.00
1.14
S3p
OB-25-371W1
Trend #2
1,058.5
1,061.5
3.00
5.66
PON-S3
Including
1,058.5
1,060.0
1.50
9.97
PON-S3
1,210.9
1,214.0
3.10
3.21
V3-S
1,216.0
1,218.5
2.50
1.86
V3-S
1,265.5
1,267.0
1.50
2.52
V3-S
1,272.7
1,274.2
1.50
1.08
V3-S
1,287.5
1,298.0
10.50
1.29
POR-S
1,323.0
1,324.5
1.50
1.45
S1p
1,327.6
1,328.7
1.10
2.41
POR-N
1,366.5
1,368.0
1.50
1.14
ZFLLC
OB-25-375
Trend #3
538.0
539.5
1.50
7.38
S3p
675.0
676.0
1.00
1.56
S3p
754.0
755.5
1.50
1.25
PON-S3
876.5
878.0
1.50
2.41
PON-S3
882.5
886.0
3.50
1.36
V3-S
Table 3
: Drill Hole Collar Information for Holes contained in this News Release
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10977/265432_a2bf4d99d4dc3aa5_007full.jpg
Notes:
Hole lengths for wedges represent meterage from point of wedge.
For more information on Radisson, visit our website at
www.radissonmining.com
or contact:
Matt Manson
President and CEO
416.618.5885
Kristina Pillon
Manager, Investor Relations
604.908.1695
Forward-Looking Statements
This news release contains "forward-looking information" within the meaning of the applicable
Canadian securities legislation that is based on expectations, estimates, projections, and
interpretations as at the date of this news release. Forward-looking statements including, but are not
limited to, statements with respect to the ability to execute the Company's plans relating to the O'Brien
Gold Project as set out in the Preliminary Economic Assessment; the Company's ability to complete
its planned exploration and development programs; the absence of adverse conditions at the O'Brien
Gold Project; the absence of unforeseen operational delays; the absence of material delays in
obtaining necessary permits; the price of gold remaining at levels that render the O'Brien Gold Project
profitable; the Company's ability to continue raising necessary capital to finance its operations; the
ability to realize on the mineral resource and mineral reserve estimates; assumptions regarding
present and future business strategies, local and global geopolitical and economic conditions and the
environment in which the Company operates and will operate in the future;, planned and ongoing
drilling, the significance of drill results, the ability to continue drilling, the impact of drilling on the
definition of any resource, and the ability to incorporate new drilling in an updated technical report and
resource modelling; the Company's ability to grow the O'Brien Gold Project; the ability to negotiate
and execute an arrangement with IAMGOLD related to the Doyon Mill on satisfactory terms or at all;
and the ability to convert inferred mineral resources to indicated mineral resources.
Any statement that involves discussions with respect to predictions, expectations, interpretations,
beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always
using phrases such as "expects", or "does not expect", "is expected", "interpreted", "management's
view", "anticipates" or "does not anticipate", "plans", "budget", "scheduled", "forecasts", "estimates",
"believes" or "intends" or variations of such words and phrases or stating that certain actions, events
or results "may" or "could", "would", "might" or "will" be taken to occur or be achieved) are not
statements of historical fact and may be forward-looking information and are intended to identify
forward-looking information. Except for statements of historical fact relating to the Company, certain
information contained herein constitutes forward-looking statements Forward-looking information is
based on estimates of management of the Company, at the time it was made, involves known and
unknown risks, uncertainties and other factors which may cause the actual results, performance or
achievements of the companies to be materially different from any future results, performance or
achievements expressed or implied by such forward-looking information. Such factors include, among
others; the risk that the O'Brien Gold Project will never reach the production stage (including due to a
lack of financing); the Company's capital requirements and access to funding; changes in legislation,
regulations and accounting standards to which the Company is subject, including environmental,
health and safety standards, and the impact of such legislation, regulations and standards on the
Company's activities; price volatility and availability of commodities; instability in the global financial
system; the effects of high inflation, such as higher commodity prices; the risk of any future litigation
against the Company; changes in project parameters and/or economic assessments as plans
continue to be refined; the risk that actual costs may exceed estimated costs; geological, mining and
exploration technical problems; failure of plant, equipment or processes to operate as anticipated;
accidents, labour disputes and other risks of the mining industry; delays in obtaining governmental
approvals or financing; risks relating to the drill results at O'Brien; the significance of drill results; and
the ability of drill results to accurately predict mineralization. Although the forward-looking information
contained in this news release is based upon what management believes, or believed at the time, to
be reasonable assumptions, the parties cannot assure shareholders and prospective purchasers of
securities that actual results will be consistent with such forward-looking information, as there may be