SGI, a Standard Industries company, is a leading mining and mineral processing company specializing in the development of roofing products, building materials, and the deployment of metabasalt on farmland for permanent carbon removal. Headquartered in Hagerstown, Maryland, SGI has six production plants powered by 700 employees who are committed to delivering the exceptional quality and service customers have come to expect for decades. For more, visit: www.specialtygranules.com.