Critical One Energy geophysical interpretation identifies significant extension potential to Howells Lake Antimony-Gold mineralisation

The new interpretive results confirm the potential for discovering additional areas of mineralisation containing both antimony and gold along highly altered and sulphide-bearing stratigraphic contacts that extend laterally westward for at least 2 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 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 the recent VTEM geophysical survey, combined with detailed geological modelling, identified characteristics of the antimony-gold mineralisation and related altered host rocks that extend west, northeast, and at depth from the antimony-gold mineralisation 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 m 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 m 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 mineralised 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 mineralised 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.
• 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.
• Newly modelled EM conductors reside below the historic east and west zones indicating lateral extension to previously intersected antimony-gold mineralisation.
• Antimony-gold mineralisation 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 categorise 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 t 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 t of antimony in 1Q-3Q 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 programme 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 our understanding of the potential of Howells Lake to be a cornerstone asset with exceptional antimony and gold exploration and development potential.”

Read the article online at: https://www.globalminingreview.com/mining/08122025/critical-one-energy-geophysical-interpretation-identifies-significant-extension-potential-to-howells-lake-antimony-gold-mineralisation/