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HIGH-GRADE ANTIMONY IN ONTARIO

Howells Lake Antimony-Gold Project

Critical One controls 24,887 ha across 697 claims, with about 30 km of priority antimony-gold targets. The project has a historic estimate of about 48M lb antimony and a target of 300M+ lb.

Near-surface high-grade material offers a fast path to market, over a larger antimony-gold system with long-term mine potential.
Why Howells Lake Matters

Scale, Grade, Proof, and Jurisdiction in One Ontario Project

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District-Scale Control
One operator holds the whole district for the first time in decades.
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Exceptional Antimony Grade
‍
Multi-metre high-grade stibnite, well above typical antimony deposits.
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Infrastructure Planning Underway
A partnership with GIP is advancing site access, logistics, and development planning.
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Top Tier Jurisdiction
Howells Lake anchors the emerging "Outer Ring of Fire" critical-minerals zone.
High-Grade Proof
District Map
Modern Targeting
Gold Upside
Modern Proof

HIGH-GRADE STIBNITE IN MODERN CORE

Most antimony is mined at a few percent. Howells Lake has returned multi-metre high-grade stibnite in more than one hole.
Hole 6: 8.0 m of 42.2% Sb. Hole 7: 4.17 m of 27.35% Sb, down-dip of Hole 6.
Both intervals include near-pure stibnite over 70% Sb,
near the 71.7% purity limit of the mineral.
Hole 16 extends massive stibnite about 70 m northeast, assays pending.
Control the Trend

From Opportunity to District Control

Critical One has consolidated the Howells Lake corridor and is now testing the East Zone with modern drilling.
24,887 ha and 697 claims under one operator.
Multiple antimony-gold targets across about 30 km.
District control supports staged drilling, step-outs, and follow-up work.
Modern Targeting

VTEM Guides the Next Drill Targets

VTEM and historical drilling are helping Critical One target continuity, depth, and new zones beyond the historic East Zone.
Conductor and structure overlaps near known mineralization.
Untested anomalies along the broader corridor.
Follow-up targets ranked for staged drilling.
Framed map displaying the calculated vertical gradient for Howells Property by Critical One Energy with a colorful gradient overlay and a legend.
slam zone

Gold Intervals Add Optionality

Gold adds a second layer of upside across the broader Howells Lake land package.
West Zone and Slam Gold Zone adds separate gold targets.
Historical drilling returned 3.54 g/t Au over 20.4 m, supporting further follow-up.
Future work can test gold targets alongside antimony step-outs.
What the Data Says

Four Signals of a Compelling Project

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Scarcity Premium
North America Needs Antimony
North America imports about 91% of its antimony, most of it from a small group of overseas producers.
Antimony averaged about US$25/lb in 2025, more than double 2024, after China restricted exports.
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Scaling Potential
District Control + Priority Targets
A 300M+ lb antimony target across about 30 km of priority trend, under one operator.
Much of the broader corridor remains underexplored by modern methods.
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Modern High-Grade Proof
Hole 6 Confirmed Near-Pure Stibnite
Pure stibnite is 71.7% Sb; Hole 6 returned 70.2% Sb, near the theoretical maximum.
Visible antimony has been reported in all early East Zone holes.
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Execution in Motion
Funded, Permitted, Drilling
A C$9M 2026 program is funded, with no corporate debt.
Ontario permit, OJEP funding, and the EFN agreement are in place, with Phase I drilling underway.
FAQ

All You Need to Know about Howells Lake

Quick answers on grade, scale, jurisdiction, catalysts, market context, and the path from discovery to potential supply.
Why does antimony matter now?

Antimony is essential to defense and industry, from ammunition and night vision to semiconductors, batteries, and flame retardants, and most uses have no proven substitute.

North America imports about 91% of its antimony, mostly from a few overseas producers, so secure supply has become a priority for governments and defense buyers.

Howells Lake gives Critical One exposure through a high-grade Ontario antimony-gold project now in modern drilling.

What is known at Howells Lake today?

The historic estimate is about 48M lb of contained antimony (roughly 1.7 million tons at 1.4% Sb). It is historical, non-43-101, and not treated as current.

Modern drilling has confirmed high-grade stibnite in more than one hole. Critical One is drilling to confirm that base and test a conceptual 300M+ lb target.

How is jurisdiction and permitting risk managed?

Howells Lake is in northwestern Ontario, an established mining jurisdiction with regional access, 120 km west of the Ring of Fire.

Critical One holds its Ontario exploration permit and has signed an exploration agreement with Eabametoong First Nation that supports consultation, environmental monitoring, and community participation.

Future permitting and engagement milestones will be reported through news releases and filings.

What catalysts should investors watch next?

Near-term: Hole 16 assays, follow-up holes at the East Zone, and step-outs along the trend. Then true-width, continuity, mineralogy, and metallurgy.

Further out: evaluation of direct-ship potential, processing and supply-chain discussions, and gold results from the Slam Gold Zone.

How could Howells Lake become relevant to North American antimony supply?

North America has little antimony mining or processing today.

If drilling, metallurgy, and permitting continue to support it, Howells Lake could supply processors, industrial buyers, and defence users.

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