Along with coal and limestone, the primary concentrate (ironsand) is heated and dried in one of four multi-hearth furnaces. It is then fed into the four reduction kilns, where it is converted to 80% metallic iron. Two melters then convert this into molten iron. The iron, at around 1480°C, is transferred to the Vanadium Recovery Unit (VRU), where vanadium-rich slag is recovered for export and further processing into a steel strengthening additive. The Ironmaking Plant at Glenbrook has the capacity to produce 650,000 tonnes of molten iron.