Large resources also occur in the Roper iron field, hosted in the Roper Group of the McArthur Basin, south of the Roper River. The field contains more than 1 billion tonnes of moderate grade iron ore, with around 85 million tonnes of higher grade direct shipping ore (57-59% Fe) at the Roper Valley and Roper Bar deposits. Mining occurred at Roper Bar in 2013-2014, with export through Bing Bong port. Iron ore in the Roper field varies from massive to oolitic and pisolitic haematite, within the Mesoproterozoic Sherwin Ironstone Member.
Iron resources also occur as part of TNG Ltd’s Mount Peake vanadium-rich magnetite project in the Aileron Province, where feasibility studies propose the production of high purity Fe2O3 with vanadium pentoxide and titanium dioxide.
Historical mining of gold- and copper-bearing ironstone at Tennant Creek has produced tailings containing up to 70% magnetite at a number of sites that are located near the Alice Springs-Darwin railway line and existing infrastructure.
Warrego tailings – Wisdom Initiative Pty Ltd 7.72 Mt @ 35.2% Fe for magnetite concentrate of 2.92 Mt @ 67.1% Fe