Since its founding in 1912 in St. Marys, Ontario, St Marys Cement has been producing cement to support new construction, modernization and infrastructure improvements across the Great Lakes region of the United States and Canada and, more recently, in the Northeast U.S. and Eastern Canada. The St Marys legacy includes landmark projects such as CN Tower, Roy Thompson Hall, Maple Leaf Gardens and the Darlington Nuclear Station, as well other renown engineering, civic and residential projects that have contributed to the growth and prosperity of the region.