Mr. Trumbull Fisher reports

ANTEROS METALS REPORTS ASSAY RESULTS FROM RM26-01 AND PROVIDES EXPLORATION UPDATE AT THE SEAGULL CRITICAL MINERALS PROJECT, ONTARIO

Anteros Metals Inc. has released assay results from drill hole RM26-01 at the Seagull critical mineral project located approximately 80 kilometres northeast of Thunder Bay, Ont. The project is operated by Rift Minerals Inc. under the option and joint venture agreement announced on Oct. 9, 2025, pursuant to which Anteros may earn an up-to-49-per-cent interest.

Assay results from selected intervals in RM26-01 have been received from ALS Chemex with sample preparation completed in Thunder Bay and sample analyses in Vancouver. Drill hole RM26-01 located at 356746mE and 5432238mN (NAD83Z16) was drilled at a dip of minus 87 degrees with an azimuth of 180 degrees. As reported previously, the drill hole intersected discontinuous orthomagmatic sulphide mineralization in the basal cumulate sequence of the Seagull intrusion between approximately 587 and 608 metres. Analysis for platinum group elements was completed using PGM-ICP24 (50-gram fire assay with ICP-AES finish), and base metals using ME-ICP61 (four-acid digestion with ICP-AES finish). Quality assurance/quality control included inserted standards and blanks, which performed within acceptable limits.

Weighted-average results using a 0.5-gram-per-tonne-platinum-plus-palladium cut-off include:

• 7.25 metres from 587.00 to 594.25 m grading 1.58 g/t Pt+Pd (0.72 part per million Pt and 0.86 ppm Pd), with 294 ppm copper and 2,168 ppm nickel;
• 1.00 m from 606.25 to 607.25 m grading 2.27 g/t Pt+Pd (1.02 ppm Pt and 1.25 ppm Pd), with 1,660 ppm Cu and 2,080 ppm Ni.

Higher-grade subsets using a 1.0 g/t Pt+Pd cut-off include 3.00 m from 591.25 to 594.25 m grading 2.26 g/t Pt+Pd and the 1.00-metre interval at 2.27 g/t Pt+Pd noted above. These mineralized intersections approximate true width of the mineralized intervals. These results confirm the presence of platinum group element mineralization in the basal contact zone, consistent with historical intersections in the area (unverified by Anteros and provided for context only). The mineralization is disseminated to weakly net textured, hosted in mafic-ultramafic cumulates.

Gas observations have been recorded in three drill holes to date. In historical hole WM01-08 (2001), pressurized gas was reported with sustained flow observed over an extended period during initial drilling. In RM26-01 (2026), a pressurized gas occurrence was intersected at approximately 877 m (initial 37,000-pascal pressure and 500 ppm carbon dioxide). Pressure decreased with time and had declined to negligible levels by the time sample canisters were on site, preventing collection of gas. The hole was sealed for monitoring of potential gas recharge. During the recent extension of historical hole WM00-05 to 900 m, minor anomalous carbon oxide indications were detected at approximately 882 metres in joints and fractures within Quetico metasedimentary rocks. These were periodic and non-sustained, with no measurable pressure or flow sufficient for sampling at the time. These preliminary gas indications across multiple holes are encouraging and support the presence of gas-bearing structures in the basement rocks beneath the Seagull intrusion, warranting further targeted evaluation to assess potential composition, volume and continuity.

Preparations are under way to resume drilling on selected existing historical holes by late April to early May, 2026, subject to field conditions. This next phase will leverage historical infrastructure to further test the basal PGE zones and evaluate the gas-bearing structures identified to date in a cost-effective manner.

"The RM26-01 assays confirm PGE mineralization in the basal contact and support continuity with historical intersections, strengthening the critical minerals potential at Seagull," said Trumbull Fisher, chief executive officer of Anteros. "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."

All observations remain preliminary, and further evaluation, including additional sampling, analysis and drilling, is continuing.

Qualified person

The scientific and technical information in this release relating to the Seagull project has been reviewed and approved by Dr. Geoff Heggie, PGeo (Ontario), a qualified person under National Instrument 43-101, independent of Anteros.

About Anteros Metals Inc.

Anteros is a Canadian mineral exploration company focused on advancing projects in Newfoundland and Labrador and select Canadian jurisdictions, targeting critical minerals relevant to the energy transition.

About Rift Minerals Inc.

Rift Minerals is a private Ontario-based corporation operating the Seagull project.

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