Anteros Metals Enters Into Letter of Intent and Announces Private Placement of up to $1 Million

St. John's, Newfoundland and Labrador--(Newsfile Corp. - October 7, 2025) - Anteros Metals Inc. (CSE: ANT) ("Anteros" or the "Company") is pleased to announce that the Company and Rift Minerals Inc. ("Rift") have entered into a binding letter of intent (the "LOI") dated October 6, 2025, pursuant to which the Company has been granted an option (the "Option") to acquire a beneficial interest in the Seagull Project, a critical minerals exploration stage property targeting platinum group elements (PGEs), nickel, copper, and helium (the "Property"). The Property is located approximately 80 kilometres northeast of Thunder Bay, Ontario.

Upon exercise of the Option, the Company and Rift shall use reasonable commercial efforts to negotiate, complete, execute and deliver a formal joint venture agreement, pursuant to which the Company may earn a working interest of up to 49% in the Property.

In order to exercise the Option, the Company shall:

• Underwrite the Phase 1 cost of a 1,350m borehole at the Property (the "Drilling") (estimated at a minimum of $400,000 and up to $600,000 of anticipated exploration costs) to earn a contingent 20% interest in the Property;

• Make a one-time up-front cash payment to Rift in the amount of $50,000, such payment to be made before the Drilling is commenced; and

• Complete a second phase of exploration pursuant to Phase 1 results and recommendations for a Phase 2 exploration program, by an independent Qualified Person.

Rift's sole asset is an option agreement (the "Option Agreement") dated July 26, 2024 with Thunder Gold Corp., whereby Rift has the option to acquire the Property. Rift has completed passive seismic imaging (ambient noise tomography) over the Property, identifying a deep low-velocity anomaly interpreted by Rift as a potential gas-bearing zone and/or mineralized feeder structure of the Seagull Intrusion. The planned drill program will test this target.

"We're pleased to partner with Rift to advance the Seagull Project as a complementary addition to our Canadian exploration portfolio," said Trumbull Fisher, CEO of Anteros. "This agreement provides low-cost exposure to a high-impact target in an emerging critical minerals jurisdiction."

The completion of the transactions contemplated by the LOI remains subject to the Company and Rift entering into a definitive agreement and the approval of all regulatory and other approvals, including the approval of the Canadian Securities Exchange.