By letter dated March 21, 2024, John Longmaid notified Black Stone Minerals, L.P. (the Partnership) of his decision to resign as a director, effective as of the close of business on March 21, 2024. Mr. Longmaid?s decision to resign is not due to any disagreement with the Partnership or the General Partner on any matter relating to the Partnership?s or the General Partner?s operations, policies, or practices.