McEwen Copper announces an additional US$10 million investment by Nuton, a Rio Tinto Venture

McEwen Copper, a subsidiary of McEwen Mining (NYSE: MUX) (TSX: MUX), is pleased to announce abinding agreement for an additional $10.0 million investment by Nuton, a Rio Tinto Venture, and existing McEwen Copper shareholder.

Nuton has agreed to invest US$10.0 million to acquire shares of McEwen Copper in a two-part transaction expected to close by October 19^th, 2023 (the “Nuton Transaction”) consisting of a private placement of 152,615 McEwen Copper common shares, and the purchase of 232,000 common shares owned by McEwen Mining in a secondary sale. Proceeds of the subscription and purchase are expected to be approximately $4.0 million to McEwen Copper and $6.0 million to McEwen Mining, respectively. The proceeds of the private placement will be used to advance the development of the Los Azules copper project in San Juan, Argentina, and for general corporate purposes.

After closing, Nuton will own 14.5% of McEwen Copper on a fully diluted basis, and McEwen Mining will own 47.7%. The transaction values McEwen Copper at approximately US$800 million.

In connection with the Transaction, McEwen Copper and certain of its affiliates agreed to amend the Nuton Collaboration Agreement to extend the period of exclusivity over novel, trade secret or patented copper heap leach technologies until February 1^st, 2025.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful.