Middleback Ranges (MBR) represents a number of surface iron ore mines, located in South Australia, approximately 60 kilometres north-west from Whyalla. MBR is wholly owned by Arrium (formerly OneSteel). MBR consists of three core mining areas: Iron Knob, Iron Baron and the South Middleback Ranges as well as a pellet plant, which forms part of the integrated steelworks at Whyalla. MBR produces 12.5Mtpa, of which 10.3Mtpa is exported and 2.2Mtpa is supplied to Arrium's Whyalla steelworks. The mine's owner Arrium is currently in administration.