SGI

SGI, a Standard Industries company, is a leading aggregates and mining company that supplies specialized products to the North American roofing, building materials, and agricultural industries. Headquartered in Hagerstown, Maryland, SGI has six production plants powered by more than 650 employees. Plants are strategically located nationwide in Blue Ridge Summit, Pennsylvania; Waynesboro, Pennsylvania; Annapolis, Missouri; Pembine, Wisconsin; Ione, California; and Trona, California. For more, visit: specialtygranules.com.