 NEW YORK, March 17, 2021 GLOBE NEWSWIRE -- Minerals Technologies Inc. NYSE: MTX MTI or the Company announced today that its Board of Directors has unanimously elected Douglas T. Dietrich, MTIs Chief Executive Officer and a member of the Board since 2016, to serve in the additional position of Chairman of the Board, effective immediately. Mr. Dietrich will be succeeding Duane R. Dunham who has been a director since 2002 and the Companys Chairman since 2016. Mr. Dunham will retire as a member of the Board of Directors when his term expires at the 2023 Annual Meeting of Shareholders. 