Critical One extends antimony zone, hits gold-zinc at Howells Lake

Toronto, Ontario--(Newsfile Corp. - June 16, 2026) - Critical One Energy Inc.  (CSE: CRTL) (OTCQB: MMTLF) (FSE: 4EF) (" Critical One " or the " Company ") is pleased to announce that new assays have extended the lower zone of antimony mineralization in drill hole HWL-2026-006 ("Hole 6") at its flagship Howells Lake Antimony-Gold Project ("Howells Lake Project"), located approximately 120 kilometers west of the Ring of Fire access corridor in Ontario, Canada. The newly assayed interval returned 15.3 meters (m) grading 1.76% antimony (Sb) from 114.7 m to 130 m down-hole and extends the lower antimony zone previously reported by the Company on May 15, 2026 . The new assays also show associated gold (Au) and zinc (Zn) mineralization in Hole 6, adding further support to the Company's interpretation that the East Zone may represent part of a broader, vertically extensive antimony-gold mineralized system.

Highlights: Hole 6 high-grade zone: Previously released assays from Hole 6 identified massive stibnite in an interval with a grade of 42.2% Sb over 8m, including 70.2% Sb over 4 m. Lower antimony zone extended: New assays from Hole 6 identified an interval of 15.3 m at 1.76% Sb from 114.7 m to 130 m, extending the lower interval previously announced on May 15, 2026 . Polymetallic signature emerging: New assays have identified polymetallic zones with intervals up to 1.17 g/t Au, 0.54% Zn, and anomalous Sb over 3 m.

Mineralized envelope expanded: Antimony mineralization in Hole 6 now spans from 79 m to 130 m down-hole, supporting the Company's interpretation that the East Zone remains open at depth. Drill program advancing: 18 holes have been completed to date for approximately 4,000 m of drilling. Critical One is improving field logistics, core handling, and sample submissions to speed up processing and support timely release of verified results.

Funded drill budget