The world's largest iron ore deposits formed when the ancient ... in eight banded iron formations — giant blocks of sedimentary rock that feature alternating layers of iron oxides, such as ...

But when exactly that ore from major mining deposits in ... In the Pilbara most hematite is found in spectacular layered sedimentary rock known as banded iron formations (BIF) that are most ...

2,500 mya: Banded iron formations Banded iron formations (BIFs) are sedimentary rocks deposited extensively ... primary source of today's global iron ore supply. From the 600 trillion tons of ...

Visitors to the Museum can touch the wavy surface of the banded iron formation The waves of colourful rock within the specimen are made up of black and red bands of iron oxide (mostly haematite and ...

On one side are multinational giants such as BHP, Rio Tinto and Vale. They aim to maximise returns on the capital they put to work while taking a cautious approach to risks. On the other are much more ...