Where are major banded iron formation deposits found around the world?

Banded iron formations (BIFs) are found on every continent and are primarily of Precambrian age. These deposits are categorized into two main types based on their geological setting and formation:12

Lake Superior-Type Deposits

These are the most economically significant BIFs, characterized by their vast lateral continuity and deposition in ancient continental shelves or sedimentary basins. Major global locations include:2
* North America: The Lake Superior region, including the Mesabi Range in Minnesota and deposits in Michigan, as well as the Labrador Trough in Canada.23
* Australia: The Hamersley Basin in Western Australia.2
* South America: The Serra dos Carajás region in Brazil.2
* Africa: The Transvaal Basin in South Africa.2

Algoma-Type Deposits

These deposits are associated with submarine volcanic rocks and generally lack the extensive lateral continuity of Lake Superior-type formations. They are notably exploited in:2
* Australia: Various locations in Western Australia.2
* Africa: Liberia.2
* North America: Regions in Canada, such as New Brunswick, where they are often found alongside volcanogenic massive sulfide deposits.2

Additionally, other significant iron ore deposits, such as the Kiruna ores in Sweden, are also recognized as classic examples of iron-rich formations.3