Dorchester Minerals CEO And Board Chair William Casey McManemin To Retire; Named Chairman Emeritus

Dorchester Minerals, L.P. (the "Partnership") (NASDAQ-DMLP) announces the retirement of Mr. William Casey McManemin from the Board of Managers of Dorchester Minerals Management GP LLC, the general partner of the Partnership's general partner (the "Board"), effective December 31, 2025.

Mr. McManemin previously led the Partnership as Chief Executive Officer for over 19 years and has been a member and Chairman of the Board since the Partnership's inception in 2003. As a co-founder of Dorchester's predecessors, he has demonstrated steadfast dedication to this organization for over 37 years.

Mr. Bradley Ehrman, Chief Executive Officer, commented "Casey's contributions to the Partnership cannot be overstated – his vision and leadership have shaped the very foundation of Dorchester Minerals. Beginning in 1988, he had the foresight and perseverance to assemble assets that now form a core part of our mineral and royalty holdings. As a leader, advisor, mentor, and friend he has exemplified the highest standard of fair-dealing, integrity, and respect to everyone fortunate enough to have worked alongside him."

In recognition of his distinguished service, the Board has named Mr. McManemin Chairman Emeritus, an honorary designation (without compensation or voting rights) that reflects his ongoing commitment to Dorchester's people and its partners.