Anteros drills one m of 2.27 g/t Pt+Pd at Seagull

Executive Summary

• Anteros Metals reports assay results from drill hole RM26-01 at the Seagull Critical Minerals Project in Ontario, confirming platinum group element (PGE) mineralization in the basal contact zone consistent with historical intersections.
• The release highlights encouraging gas observations across three drill holes, including pressurized gas and sustained flow in historical holes, indicating a potential gas-bearing system in the basement rocks beneath the intrusion.
• Drilling is scheduled to resume in late April to early May 2026 to cost-effectively test basal PGE zones and further evaluate the identified gas-bearing structures using existing historical infrastructure.

Key Details

• Project & JV Terms: Seagull Critical Minerals Project, ~80 km NE of Thunder Bay, Ont. Operated by Rift Minerals Inc. under an option and joint venture agreement (announced Oct. 9, 2025) allowing Anteros to earn up to a 49% interest.
• Assay Methodology: Samples processed by ALS Chemex (Thunder Bay prep, Vancouver analysis). PGEs analyzed via PGM-ICP24 (50-gram fire assay with ICP-AES finish); base metals via ME-ICP61 (four-acid digestion with ICP-AES finish). QA/QC standards and blanks performed within acceptable limits.
• Assay Results (0.5 g/t Pt+Pd cut-off):
• 7.25 m from 587.00 to 594.25 m grading 1.58 g/t Pt+Pd (0.72 ppm Pt, 0.86 ppm Pd), with 294 ppm Cu and 2,168 ppm Ni.
• 1.00 m from 606.25 to 607.25 m grading 2.27 g/t Pt+Pd (1.02 ppm Pt, 1.25 ppm Pd), with 1,660 ppm Cu and 2,080 ppm Ni.
• Higher-Grade Subsets (1.0 g/t Pt+Pd cut-off):
• 3.00 m from 591.25 to 594.25 m grading 2.26 g/t Pt+Pd.
• 1.00 m interval at 2.27 g/t Pt+Pd.
• Mineralization Characteristics: Intersected discontinuous orthomagmatic sulphide mineralization in the basal cumulate sequence of the Seagull intrusion (~587–608 m). Mineralization is disseminated to weakly net textured, hosted in mafic-ultramafic cumulates, and approximates true width.
• Gas Observations:
• Historical hole WM01-08 (2001): Pressurized gas with sustained flow observed over an extended period.
• RM26-01 (2026): Pressurized gas intersected at ~877 m (initial 37,000-pascal pressure, 500 ppm CO2). Pressure declined before sampling; hole sealed for monitoring potential gas recharge.
• Historical hole WM00-05 (extended to 900 m): Minor anomalous carbon oxide at ~882 m in Quetico metasedimentary rocks. Periodic, non-sustained, no measurable pressure/flow.
• Future Drilling Plans: Resumption targeted for late April to early May 2026 (subject to field conditions). Phase will leverage historical infrastructure to further test basal PGE zones and evaluate gas-bearing structures.
• Qualified Person: Scientific and technical information reviewed and approved by Dr. Geoff Heggie, PGeo (Ontario), independent of Anteros, under National Instrument 43-101.

Notable Quotes

• Trumbull Fisher, CEO: "The RM26-01 assays confirm PGE mineralization in the basal contact and support continuity with historical intersections, strengthening the critical minerals potential at Seagull... The observation of gas indications in three holes to date, including historical sustained flow in WM01-08, is encouraging and highlights the presence of a gas system that merits continued investigation. We look forward to resuming drilling in the spring to advance both the PGE and gas objectives."