Anteros plans phase 1 extension drilling at Seagull

Executive Summary

• Anteros Metals plans a Phase 1 extension drilling program at the Seagull Critical Minerals Project in Ontario, operated by Rift Minerals under an earn-in option agreement.
• The program builds on recent drilling (hole RM26-01) that intersected orthomagmatic sulphide mineralization and a gas-bearing interval in Archean basement rocks.
• Drilling will leverage existing historical holes to efficiently test deep targets for Ni-Cu-PGE systems and gas occurrences, subject to final design, budgets, and financing.

Key Details

• Project Location & Structure: Seagull Critical Minerals Project, ~80 km NE of Thunder Bay, Ontario. Operated by Rift Minerals under an option agreement (announced Oct 9, 2025) allowing Anteros to earn up to a 49% interest.
• Addendum Terms: Provides Anteros the right (not obligation) to conduct a revised Phase 1 extension program; expenditures under the revised program will be credited against potential Phase 2 exploration expenditures.
• Recent Drilling Results (RM26-01): Intersected discontinuous orthomagmatic sulphide mineralization within the basal cumulate sequence between ~589 and 608 metres. Also intersected a gas-bearing interval at ~877 metres within a narrow fault zone in Archean basement rocks.
• Gas Occurrence Context: Situated at a similar stratigraphic position to historical hole WM-01-08 (~100 metres away). Significance, continuity, and composition are under evaluation.
• Geophysical Integration: Ambient noise tomography (ANT) velocity modeling used to refine the interpreted geometry of the Seagull intrusion and underlying basement, informing Phase 1 extension options.
• Technical Objectives:
• Continue evaluating orthomagmatic sulphide mineralization associated with Ni-Cu-PGE systems at the basal contact of the Seagull intrusion.
• Test the ~877-metre elevation to evaluate the presence and geological context of gas within a subhorizontal structural feature.
• Collect samples for laboratory analysis to support evaluation of sulphide mineralization and gas occurrence.
• Drilling Methodology: Leveraging previously completed historical drill holes as platforms for extension drilling to efficiently test deep mineralization and gas-bearing structures while managing time, cost, and surface disturbance.
• Status & Dependencies: Program subject to final design, approved budgets, field conditions, and financing. Laboratory assay results are pending. All observations to date are visual/preliminary and subject to revision.
• Qualified Person: Dr. Geoff Heggie, PGeo (Ontario), independent of Anteros Metals.

Notable Quotes

• Trumbull Fisher, CEO: "The phase 1 extension represents a logical next step to build on observations from drill hole RM26-01, including the occurrence of gas and basal sulphide mineralization. By leveraging existing drill holes, we are able to further evaluate these features and advance our technical understanding of the Seagull critical minerals system."