Sherwin Alumina Company, LLC is an alumina producer headquartered in Gregory, Texas, operating a specialized refinery capable of producing approximately 1.65 million metric tons of smelter-grade alumina annually. The facility utilizes the Bayer Process to refine Jamaican bauxite and maintains a deep-water port on the Gulf Coast. An indirect wholly-owned subsidiary of Glencore plc, the company employs approximately 160 full-time salaried staff and supports extensive regional operations, generating $348 million in 2015 revenue.