Radomiro Tomic is a division of Chilean state-run copper producer Codelco responsible for operating the Radomiro Tomic open-pit mine, located 40km from the city of Calama, in Chile's Antofagasta region (II). It engages in copper oxide recovery and cathode production by electrowinning process; cathodes are 70kg, 1mx1m plates with 99.99% purity. The mine reserves are 1,800Mt of sulfide with a grade of 0.5%, which are sent through an overland conveyor belt to be processed at Codelco's Chuquicamata Division's concentrator. In 2016, the company replaced its bucket wheel excavator, increasing capacity from 11,750t of ore per hour to 14,500t of ore excavated per hour; the world's largest excavator of its kind. The Radomiro Tomic is headquartered in Calama.