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Resource Iron Ore (Magnetite and Hematite)
CompanyOneSteel Manufacturing Pty Ltd (part of the SIMEC Mining Group)
Status Operating
Mining operation

OneSteel Manufacturing operates open-cut mines in the Middleback Ranges producing both magnetite and hematite ore for steel production and export respectively.

Some is also shipped to Port Kembla and Newcastle New South Wales, in the form of blended fines and pellets.

Location Middleback Ranges, southwest of Whyalla, Eyre Peninsula.middleback_range_blue
Tenement information

The Middleback Ranges Project comprises of a number of tenements which are broadly considered under different Mining Areas.

Mining is undertaken in three areas with multiple pits, including:

  • South Middleback Ranges (SMR) Mining area
  • Iron Baron Mining area
  • Iron Knob Mining area

Download map showing Middleback Ranges tenements via the South Australian Resources Information Gateway (SARIG).

The deposit

Iron ore deposits comprising of magnetite and hematite found within the Middleback Ranges that forms part of the Cleve sub-domain of the Gawler Craton and is comprised primarily of Early Proterozoic metasediments of the Hutchison Group.

Resource estimates and production estimates

Company released resource estimates and production statistics for South Australia's major operating and approved mines are summarised in South Australia's major operating/approved mines: resources estimates and production statistics (PDF, updated regularly).

Approval process

Programs for environment protection and rehabilitation have been submitted and approved for each mining area.

Documents and reports 

Program for environment protection and rehabilitation (PEPR)


For more information, contact:

For a copy of reports in an alternative format contact the Resource Information Centre
Customer Services
Phone: +61 8 8463 3000
For inquiries relating to this mining operation please contact the Mining Regulation Branch
Phone: + 61 8 8463 3484