After a 59-year history that most recently included changes in ownership, a devastating explosion, layoffs and its ultimate shutdown, the Androscoggin Mill in Jay has sold to an investment group that plans to auction off the paper-making equipment and find new uses for the real estate. The mill was purchased from owner Pixelle Specialty Solutions by JGT2 Redevelopment LLC, a joint venture of New Mill Capital Holdings, Infinity Asset Solutions and Camjay LLC, according to a news release Thursday.