Gold Resource Corporation Announces Special Shareholder Meeting to Vote on Strategic Merger With Goldgroup Mining

With Proxy Materials Officially Being Mailed, the Board Urges Shareholders to Vote “FOR” the Milestone Deal That Will Combine Core Assets and Drive Long-Term Shareholder Value

Gold Resource Corporation (NYSE American: GORO) (the “Company,” “we,” “our,” or “GRC”) today announced updates regarding our upcoming Special Meeting of Shareholders (the “Special Meeting”) scheduled for July 2, 2026. The definitive proxy statement has been filed with the Securities and Exchange Commission (the “SEC”), and mailing has been completed to shareholders of record as of May 26, 2026.

The Goldgroup Merger: Unlocking Shareholder Value

Following the finalization of the definitive transaction documentation, the Company is moving into the final approval phase of its strategic combination. Under the terms of the Arrangement Agreement and Plan of Merger dated January 25, 2026, as amended on May 15, 2026, the Company will combine with Goldgroup Mining Inc. (TSX-V: GGA; OTC: GGAZF) (“Goldgroup”) via a reverse triangular merger with Goldgroup Merger Sub, Inc., a wholly owned subsidiary of Goldgroup (the “Merger”).