Critical One Energy Geophysical Interpretation Identifies Significant Extension Potential to Howells Lake Antimony-Gold Mineralization
Critical One Energy Geophysical Interpretation Identifies Significant
Extension Potential to Howells Lake Antimony-Gold Mineralization
Toronto, ON – December 2, 2025 – Critical One Energy Inc. (formerly Madison Metals Inc.)
(“Critical One” or the “Company”) (CSE: CRTL) (OTCQB: MMTLF) (FSE: 4EF0) , a leading
Canadian mining exploration company focused on critical metals and minerals , is pleased to
announce that advanced geophysical and geological mode lling of a recently completed VTEM
airborne magnetic and electromagnetic (EM) geophysical survey has identified significant potential
expansions to the mineralization at its Howells Lake Antimony-Gold Project (“Howells Lake
Project”). The new interpretive results confirm the potential for discovering additional areas of
mineralization containing both antimony and gold along highly altered and sulphide-bearing
stratigraphic contacts that extend laterally westward for at least two kilometres (km). Modelled EM
conductors also reside at depth below historic drilling and along strike of a magnetic low structural
corridor. The new interpretive work indicates that the favourable stratigraphy is steeply dipping and
extends to a depth of more than 300 metres (m). The Howells Lake Project is located approximately
120 km west of the Ring of Fire road corridor in the Thunder Bay North Mining Division of Ontario,
Canada.
Analysis of t he recent VTEM geophysical survey, combined with detailed geological model ling,
identified characteristics of the antimony -gold mineralization and related altered host rocks th at
extend west, northeast, and at depth from the antimony-gold mineralization discovered in 1979 .
The analysis reveals:
• Previous drilling at the historical Howells Lake West Zone intersected up to 4.7% antimony
and 25.5 g/t gold over 1.43 metres in discovery drill hole W-79-2
• Previous drilling at Howells Lake East Zone intersected up to 75% antimony within an
interval of 5.37% antimony over 8.35 metres in drill hole MC -V3-79-22 and 1.18%
antimony over 5.8 metres in drill hole MC-V3-79-11
• Alteration mapping, data reconstruction , and geophysical interpretation show the West
antimony-gold zone to be a west-striking, north-dipping, silicified, and strongly altered and
mineralized zone containing stibnite (antimony sulphide), pyrite, and pyrrhotite as well as
brecciated graphite with stibnite
• Modelling of the newly defined EM anomalies associated with the mineralized zone shows
an extension of airborne electromagnetic responses or clusters of anomalies extending from
the drilled area for at least 2 km to the west (Figure 1)
• EM anomalies also extend northeast and at depth (>300 m) along a magnetically low
structural corridor previously known to span over 8 km of the current claims (Figures 1, 2)
• Newly modelled EM conductors reside below the historic east and west zones indicating
lateral extension to previously intersected antimony-gold mineralization (Figure 2)
• Antimony-gold mineralization is interpreted to be controlled by a late west-striking, north-
dipping altered stratigraphy and fault zones on the margins of a feldspar porphyry
• EM anomalies to the west indicate favourable stratigraphy outside of the historic V -3
deposit, while the northeast-southwest striking magnetic low may host additional porphyries
that mark conduits to ore-forming fluids
• Additional modelling helped to confirm and categorize other similar antimony-gold targets,
some associated with strong antimony in lake sediment geochemical anomalies, along the
30 km strike length of favourable geology on the Company’s 25,000-hectare property
• Howells Lake is the only significant new antimony-gold project in Ontario . The only
advanced project to contain significant reserves of antimony-gold in North America is
Perpetua Resources' Stibnite Gold Project, which contains total proven and probable
reserves of 4.8 million oz of gold grading 1.43 g/t, and 74,000 tons of antimony grading
0.064%. Current North American production is limited to Americas Gold and Silver
Corporation’s Galena Complex that has recently produced 224 tons of antimony in Q1 -Q3
of 2025
“As we work our way through the new geophysical data and integrate that information into our public
and private dataset, we are consolidating our ideas on how we will execute our initial, fully funded
drill program to evaluate the significant antimony and gold potential at Howells Lake,” said Duane
Parnham, Founder, Executive Chairman and CEO of Critical One . “These interpretive results
validate ou r understanding of the potenti al of Howells Lake to be a cornerston e asset with
exceptional antimony and gold exploration and development potential.”
Geological and geophysical data review and analysi s are ongoing. Critical One is also advancing
its exploration program plans for follow -up drilling to delineate and expand the antimony -gold
deposits (see the press releases dated August 28, 2025 and September 4, 2025, respectively).
Figure 1: Plan View of the latest geophysical results at the Howells Lake Antimony-Gold Project.
AEM anomalies and modelled “ Deep EM” Maxwell plates overlay airborne magnetic intensity
(FVD).
Figure 2: North-looking cross section of Howells Lake antimony -gold zones . Modelled EM
conductors show potential for lateral extension of mineralized zones below historic drilling.
The Howells Lake Project hosts a historical resource of 1.7 million tons at a grade of 1.4% antimony
with associated gold mineralization. The resource is not National Instrument (NI) 43-101 compliant
and therefore readers should not rely on the information. The resource estimate does not include
categories as required under NI 43-101 and the report predates NI 43-101 by decades. Given the
work was completed more than 40 years ago, all work w ill need to be redone as the historic work
cannot be used in a NI 43-101 compliant report. Geological mapping as well as significant drilling
will be required to establish a NI 43-101 resource estimate for the known antimony mineralization.
The resource presented in the report does not provide the parameters used in the preparation of
the resource estimate (tonnage estimate). Historical Report Reference: Themistocleous, S.G.,
Idziszek, C., 1980. Miminiska Lake Project Northwestern Ontario Geological Report, New Jersey
Zinc Exploration Company (Canada) Ltd. (*Also see historical information disclosure below.)
*Note: All geological and assay information contained in this document is historical in nature and
the Qualified Person (“QP”) responsible for the technical disclosure in this release is unable to
determine if any of that data would meet current NI 43 -101 regulations regarding disclosure of
scientific and technical information. Additionally, the QP has not done sufficient work to make the
resource current. Drill intersections are reported as downhole intervals. No true width could be
determined at this time. The information in the data recovered is considered of value and relevant
to the Company’s project. However, the Issuer is not treating the estimate as current.
References:
1. Themistocleus, S.G., 1980. Miminiska Lake Project, Northwestern Ontario, Geological Report,
New Jersey Zinc Exploration Company (Canada) Ltd.
Qualified Person
Matthew Trenkler, P.Geo. and Chief Geological Officer, Critical One Energy Inc., a Qualified Person
(“QP”) under NI 43 -101, has reviewed and approved the scientific and technical content of this
news release. All technical information in this release pertaining to geology and assays is based on
historical data that cannot be verified by the QP.
About Critical One Energy Inc.
Critical One Energy Inc. (formerly Madison Metals Inc.) is a forward -focused critical minerals and
upstream energy company, powering the future of clean energy and advanced technologies. The
Howells Lake Antimony -Gold Project focuses the Company’s exposure on antimony, one of the
most in-demand critical minerals, as well as gold, which is known to occur at numerous locations
on the Howells Lake Project. Backed by seasoned management expertise and prime resource
assets, Critical One is strategically positioned to meet the rising global demand for critical minerals
and metals. Its mine exploration portfolio is led by antimony -gold exploration potential in Canada
and uranium investment interests in Namibia, Africa. By leveraging its technical, managerial, and
financial expertise, the Company upgrades and creates high-value projects, thereby driving growth
and delivering value to its shareholders.
Additional information about Critical One Energy Inc. can be found at criticaloneenergy.com and on
the Company’s SEDAR+ profile at www.sedarplus.ca.
For further information, please contact:
Duane Parnham
Executive Chairman & CEO
Critical One Energy Inc.
+1 (416) 489-0092
Media inquiries:
Adam Bello
Manager, Media & Analyst Relations
Primoris Group Inc.
+1 (416) 489-0092
Neither the Canadian Securities Exchange nor CIRO accepts responsibility for the adequacy or
accuracy of this release.
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