Omya is a worldwide mineral processing company, with North, Central, and South American headquarters located in Cincinnati, Ohio. In Vermont, Omya quarries marble, which then is ground, milled, and purified to produce a finely ground calcium carbonate. Calcium carbonate is a necessary ingredient used in a wide array of consumer products ranging from paint and paper, to vinyl siding and diapers. With over 120 employees, we are a large and economically significant employer in Vermont. And every two years, Omya hosts a open house at the Middlebury quarry, featuring free food, quarry tours, exhibits and more!