Form 8-K Filing: Gold Resource Corporation Merger Agreement and Supplemental Disclosures

This Form 8-K filing by Gold Resource Corporation provides supplemental disclosures related to the previously announced Arrangement Agreement and Plan of Merger with Goldgroup Mining Inc. The merger, where Goldgroup Merger Sub Inc. will merge with and into the Company, with the Company surviving as a subsidiary of Goldgroup, was initially announced on January 25, 2026, and amended on May 15, 2026. The Company filed a definitive proxy statement on May 29, 2026. Several lawsuits have been threatened by purported shareholders challenging the disclosures in the proxy statement. While the Company and Goldgroup believe these claims are without merit, supplemental disclosures are being provided voluntarily to mitigate litigation burdens. These disclosures update information regarding the number of outstanding shares, confirm the absence of "don't ask, don't waive" provisions in certain agreements, and provide detailed prospective financial and operating information for both Gold Resource Corporation and Goldgroup Mining Inc. for the years 2026 through 2031. This prospective information, including production, gold prices, all-in sustaining costs, operating cash flow, capital expenditures, and free cash flow, is presented with numerous disclaimers regarding its inherent uncertainties and non-GAAP nature. The Company emphasizes that these projections should not be relied upon as indicative of future performance and are expressly qualified by risk factors detailed in other SEC filings.