Dean Mahon Plans Retirement Dean of Students, Dr. Patricia Mahon, is retiring after 21 years of service. Dean of Students, Dr. Patricia Mahon is retiring after 21 years of service to South Dakota Mines. This letter is published in the most recent edition of The Hardrock magazine. This spring, university dedicated a new plaza on campus to Dean Mahon. Dear Campus Community, In June I will be retiring. It has been an honor and a privilege to serve as the Vice President for Student Development and Dean of Students at South Dakota Mines for the past 21 years. The joy of coming to work has been centered around