McEwen Mining Files NI 43-101 Technical Report for Tartan Mine Project, Confirming 308,900 oz Gold Indicated Resource

McEwen Inc. (NYSE: MUX) (TSX: MUX) announced it has filed an independent National Instrument 43-101 technical report for its Tartan Mine Project in Manitoba, supporting the previously reported mineral resource estimate. The report, with an effective date of Dec. 31, 2025, confirms 308,900 ounces of gold in indicated resources and 302,700 ounces in inferred resources.

The filing marks a significant step for the company as it continues to expand its gold and silver production footprint. McEwen’s operations span prolific mineral-rich regions across the Americas, including the Cortez Trend in Nevada, the Timmins district of Ontario, Flin Flon in Manitoba, and the Deseado Massif in Santa Cruz province, Argentina. The company is also reactivating its gold-silver El Gallo Mine in Mexico.

Beyond its precious metals production, McEwen holds a 46.3% interest in McEwen Copper, which owns the large, long-life Los Azules copper development project in San Juan province, Argentina. According to the last financing for McEwen Copper, the implied value of McEwen’s ownership interest is US$456 million (US$7.67 per share). The Los Azules project is designed to be one of the world’s first regenerative copper mines and aims to be carbon neutral by 2038, with its Feasibility Study results announced in an October 7, 2025 press release.

McEwen also recently purchased 27.3% of Paragon Advanced Labs Inc., a newly listed public company deploying PhotonAssay units globally. This technology, which the company believes is poised to become the new industry standard for assaying precious and base metals, positions Paragon as a potential leading service provider.

Chairman and Chief Owner Rob McEwen has invested over US$250 million personally and takes a salary of $1 per year, aligning his interests with shareholders. A recipient of the Order of Canada, member of the Canadian Mining Hall of Fame, and winner of the EY Entrepreneur of the Year (Energy) award, his objective is to build MUX’s profitability, share value, and ultimately implement a dividend policy, as he did while building Goldcorp Inc.

The Tartan Mine project adds to McEwen’s growing resource base, providing further exposure to gold production in a stable jurisdiction. The company’s shares trade on both the NYSE and TSX under the ticker MUX. For more information, visit the company’s newsroom at https://ibn.fm/MUX.

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