Ridley Magnetite Project JV Potential, page-20

Tassie Operation being going a long time - While the bulk of Rio Tinto and BHP Billiton’s Pilbara operations involve simple crushing and screening before being trucked, railed and shipped off as a 58-63% iron product to steel mill customers, magnetite deposits, because of their lower in-ground grade, require upgrading and concentrating. In the case of Savage River this involves a concentration process which upgrades the 27% iron grade magnetite ore to a 67% concentrate through an on-site circuit. The concentrate is then slurried 87km to its facility at Port Latta on Tasmania’s north-west coast where Grange converts the concentrate into iron ore pellets (essentially oxidising the material to convert it from magnetite to hematite) grading 65-69% ore.

http://www.grangeresources.com.au/c...esources_story_-_vol_1_issue_183_may_2011.pdf