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Mesabi Range
47°30′N 93°4′W / 47.500°N 93.067°W
The Mesabi Iron Range is a mining district and mountain range in northeastern Minnesota following an elongate trend containing large deposits of iron ore. It is the largest of four major iron ranges in the region collectively known as the Iron Range of Minnesota. First described in 1866, it is the chief iron ore mining district in the United States. The district is located largely in Itasca and Saint Louis counties. It has been extensively worked since 1892 and has seen a transition from high-grade direct shipping ores through gravity concentrates to the current industry exclusively producing iron ore (taconite) pellets. Production has been dominantly controlled by vertically integrated steelmakers since 1901 and therefore is dictated largely by US ironmaking capacity and demand.
The Mesabi Range was known to the local Ojibwe as Misaabe-wajiw ('Giant mountain'). Throughout the Mesabi Range, Mesaba and Missabe spelling variations are found along with places containing Giant in their names.
There are four iron ranges in northern Minnesota: the Cuyuna, the Vermilion, the Mesabi, and the Gunflint. Most of the world's iron ore, including that contained in northern Minnesota, was formed during the middle Precambrian. During this period, erosion leveled mountains. This erosion released iron and silica into the waters of a new sea. Marine algae living in this new sea raised the level of atmospheric oxygen. This oxygen catastrophe caused the eroded iron to precipitate into the banded iron formations found in northern Minnesota and other members of the Animikie Group. Over billions of years, geological forces left behind ore deposits of varied quality and concentrations – differences that would determine how the ore was mined from place to place. On the Mesabi Range, stretching 100 miles (160 km) from Grand Rapids to Babbitt, soft ore lay close to the surface, where it could be scooped from open pit mines.
The overall structure of the range is that of a monocline dipping 5 to 15 degrees to the southeast. Key faults include the Calumet, La Rue, Morton, Biwabik, and the Siphon. The Duluth Gabbro complex to the east has caused metamorphic changes in the Biwabik formation. The natural iron ores and the magnetite taconites occur in this Precambrian Biwabik formation, which is a cherty layer 340–750 feet (100–230 m) thick. The natural ores are located in elongated channels or tabular deposits, while the magnetite taconites occur in stratigraphic zones. Natural ores have an iron content of 51 to 57 per cent while the taconites are 30 to 35 percent iron, and are beneficiated to pellets contain 60 to 67 per cent. The natural ores are mainly mixtures of hematite and goethite. The most common silicate is Minnesotaite. Also of note are the presence of algal structures in the Biwabik formation.
The Mesabi Range is 110 miles (180 km) long. Heights vary from 200–500 feet (61–152 m). The highest point, located about 5.6 miles (9.0 km) northeast of Virginia, is Pike Mountain at 1,950 feet (590 m). The range trends from the northeast to the southwest, extending from Babbitt to Grand Rapids.
The Embarrass Mountains are a small subrange of the Mesabi Range, spanning about 9 miles (14 km) through northern White Township and Hoyt Lakes in St. Louis County. Heights vary from 200–400 feet (61–122 m). The highest point, at 1,940 feet (590 m), is roughly 1.9 miles (3.1 km) west of the unincorporated community of Hinsdale, near the former Erie Mining Company's pits and taconite processing plant.
Iron-bearing rocks were noted by the Minnesota State Geologist Henry H. Eames in 1866. Iron ore was discovered north of Mountain Iron, Minnesota on November 16, 1890 by J. A. Nichols of the Merritt brothers. The range was defined by 1900. Initially underground mines were employed but these gave way to open pits so that by 1902, half the operations were conducted this way. The last underground mine closed in 1960. Natural ores eventually gave way to iron-ore concentrates from magnetite taconite so that by 1965 one third of production came from these pellets.
Mesabi Range
47°30′N 93°4′W / 47.500°N 93.067°W
The Mesabi Iron Range is a mining district and mountain range in northeastern Minnesota following an elongate trend containing large deposits of iron ore. It is the largest of four major iron ranges in the region collectively known as the Iron Range of Minnesota. First described in 1866, it is the chief iron ore mining district in the United States. The district is located largely in Itasca and Saint Louis counties. It has been extensively worked since 1892 and has seen a transition from high-grade direct shipping ores through gravity concentrates to the current industry exclusively producing iron ore (taconite) pellets. Production has been dominantly controlled by vertically integrated steelmakers since 1901 and therefore is dictated largely by US ironmaking capacity and demand.
The Mesabi Range was known to the local Ojibwe as Misaabe-wajiw ('Giant mountain'). Throughout the Mesabi Range, Mesaba and Missabe spelling variations are found along with places containing Giant in their names.
There are four iron ranges in northern Minnesota: the Cuyuna, the Vermilion, the Mesabi, and the Gunflint. Most of the world's iron ore, including that contained in northern Minnesota, was formed during the middle Precambrian. During this period, erosion leveled mountains. This erosion released iron and silica into the waters of a new sea. Marine algae living in this new sea raised the level of atmospheric oxygen. This oxygen catastrophe caused the eroded iron to precipitate into the banded iron formations found in northern Minnesota and other members of the Animikie Group. Over billions of years, geological forces left behind ore deposits of varied quality and concentrations – differences that would determine how the ore was mined from place to place. On the Mesabi Range, stretching 100 miles (160 km) from Grand Rapids to Babbitt, soft ore lay close to the surface, where it could be scooped from open pit mines.
The overall structure of the range is that of a monocline dipping 5 to 15 degrees to the southeast. Key faults include the Calumet, La Rue, Morton, Biwabik, and the Siphon. The Duluth Gabbro complex to the east has caused metamorphic changes in the Biwabik formation. The natural iron ores and the magnetite taconites occur in this Precambrian Biwabik formation, which is a cherty layer 340–750 feet (100–230 m) thick. The natural ores are located in elongated channels or tabular deposits, while the magnetite taconites occur in stratigraphic zones. Natural ores have an iron content of 51 to 57 per cent while the taconites are 30 to 35 percent iron, and are beneficiated to pellets contain 60 to 67 per cent. The natural ores are mainly mixtures of hematite and goethite. The most common silicate is Minnesotaite. Also of note are the presence of algal structures in the Biwabik formation.
The Mesabi Range is 110 miles (180 km) long. Heights vary from 200–500 feet (61–152 m). The highest point, located about 5.6 miles (9.0 km) northeast of Virginia, is Pike Mountain at 1,950 feet (590 m). The range trends from the northeast to the southwest, extending from Babbitt to Grand Rapids.
The Embarrass Mountains are a small subrange of the Mesabi Range, spanning about 9 miles (14 km) through northern White Township and Hoyt Lakes in St. Louis County. Heights vary from 200–400 feet (61–122 m). The highest point, at 1,940 feet (590 m), is roughly 1.9 miles (3.1 km) west of the unincorporated community of Hinsdale, near the former Erie Mining Company's pits and taconite processing plant.
Iron-bearing rocks were noted by the Minnesota State Geologist Henry H. Eames in 1866. Iron ore was discovered north of Mountain Iron, Minnesota on November 16, 1890 by J. A. Nichols of the Merritt brothers. The range was defined by 1900. Initially underground mines were employed but these gave way to open pits so that by 1902, half the operations were conducted this way. The last underground mine closed in 1960. Natural ores eventually gave way to iron-ore concentrates from magnetite taconite so that by 1965 one third of production came from these pellets.
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