production. Banded iron formations were first discovered in northern Michigan in 1844. Banded iron formations account for more than 60% of global iron reserves...

mixture of banded iron formations and granular iron formations. Iron formations can be divided into subdivisions known as: banded iron formations (BIFs) and...

this time. Banded iron formation largely disappears from the geological record at 1.85 Ga, after peaking at about 2.5 Ga. Banded iron formation can form...

history of the NGB. The banded iron formation can be traced continuously across the northern portion of the belt. The formation is composed mainly of quartz...

quartz). Banded iron formations occur exclusively in Precambrian rocks, and are commonly weakly-to-intensely metamorphosed. Banded iron formations may contain...

typically 2.5 to 2.9 g/cm3. Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper. The name means "spotted or speckled...

mines and iron ore treatment plants. US iron ore mining is dominated by the Precambrian banded iron formation deposits around Lake Superior, in Minnesota...

The Gunflint chert (1.88 Ga) is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and northwestern...

is generally quite iron-rich. Jaspillite is typically a banded mixture of hematite and quartz common in the banded iron formation rocks of Proterozoic...

deposits of iron ore, producing a large proportion of Australia's iron ore exports. It is predominately associated with banded iron formation. Western Australia's...