Omya is a worldwide mineral processing company, with operations in North, Central, and South America with 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 200 employees, they are a large and economically significant employer in Vermont.