Iron | Geoscience Australia
The iron content of these ores varies widely and until recently most deposits needed to have an average grade of more than 60% iron for mining to be commercially viable. However, some deposits can now have iron grades between 56%59% iron and be commercially viable. BIF enrichment deposits occur in Western Australia in the Pilbara ( Yarrie), and the Yilgarn Block ( Koolyanobbing) and