For the city in the United States, see Taconite, Minnesota.
Taconite
Sedimentary iron formation rock
Composition
Primary
Magnetite, hematite and chert
Secondary
Siderite, greenalite, minnesotaite and stilpnomelane
Taconite (/ˈtækənaɪt/) is a variety of banded iron formation, an iron-bearing (over 15% iron) sedimentary rock, in which the iron minerals are interlayered with quartz, chert, or carbonate. The name "taconyte" was coined by Horace Vaughn Winchell (1865–1923) – son of Newton Horace Winchell, the Minnesota State Geologist – during their pioneering investigations of the Precambrian Biwabik Iron Formation of northeastern Minnesota. He believed the sedimentary rock sequence hosting the iron-formation was correlative with the Taconic orogeny of New England, and referred to the unfamiliar and as-yet-unnamed iron-bearing rock as the 'taconic rock' or taconyte.[1]
Following development of high grade direct shipping iron ore deposits on the Mesabi Range, containing up to 65% iron and as little as 1.25% silica, miners termed the unaltered iron-formation wall rock taconite. The iron content of taconite is generally 30% to 35%, and the silica content generally around 45%. Iron in taconite is commonly present as magnetite, iron silicates, and iron-bearing carbonates, and locally martite (hematite) formed by oxidation of magnetite. Horizons containing magnetite as the dominant mineral have been extensively mined since 1955 to produce iron ore pellets; the term 'taconite' has consequently been colloquially adapted to describe the magnetite iron-formation ores (taconite iron ore), the mining, milling, magnetic separation, and agglomerating process (taconite process), and the product iron ore pellets (taconite pellets).
^Winchell, Horace V. (1891) "The Mesabi iron range," in: Winchell, Newton H., ed., The Geological and Natural History Survey of Minnesota (Minneapolis, Minnesota, USA: Harrison & Smith), vol. 20, p. 124. From p. 124: "This rock is widely spread over the whole length of the Mesabi, and being different from anything found elsewhere and peculiar to this horizon of the Taconic, has been called taconyte by the writer."
Taconite (/ˈtækənaɪt/) is a variety of banded iron formation, an iron-bearing (over 15% iron) sedimentary rock, in which the iron minerals are interlayered...
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or jaspilite) began to be concentrated, and in 1956, the magnetite ore (taconite) was concentrated on a large scale. The concentrated ore is commonly formed...
to connect Hoyt Lakes taconite plant and the location of its ore dock at Taconite Harbor on Lake Superior, from which the taconite was shipped to eastern...
ores and concentrates were produced from 1848 until the mid-1950s, when taconites and jaspers were concentrated and pelletized, and started to become the...
gravity concentrates to the current industry exclusively producing iron ore (taconite) pellets. Production has been dominantly controlled by vertically integrated...
of lower-grade iron ore sources, principally the use of magnetite and taconite. Iron ore mining methods vary by the type of ore being mined. There are...
afterwards to be in two large pieces. For 17 years, Edmund Fitzgerald carried taconite (a variety of iron ore) from mines near Duluth, Minnesota, to iron works...
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Acindar - Villa Constitución, Argentina Ilva - Taranto, Italy Hibbing Taconite - Hibbing, United States Vanderbijlpark, South Africa Joint ventures: AM/NS...
taconite. As a researcher at the University of Minnesota, Davis developed an engineering process to economically extract iron ore from hard taconite rocks...
for more than a century. Although the high-grade ore is now depleted, taconite mining continues, using processes developed locally to save the industry...
depositing layers of sediments that compacted and became limestone, dolomite, taconite and the shale at Kakabeka Falls. The continental crust was later riven...
Bentonite is also used as a binding agent in the manufacture of iron ore (taconite) pellets as used in the steelmaking industry. Bentonite, in small percentages...