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Gangue, typically quartz, magnetite, garnet, chromite and kyanite, which usually account for the remaining bulk of the THM content; Slimes, typically minerals as above and heavy clay minerals, too fine to be economically extracted. Generally, as zircon is the most valuable component and a critical ore component, high-zircon sands are the most ...
Magnetite crystals with a cubic habit are rare but have been found at Balmat, St. Lawrence County, New York, [47] [48] and at Långban, Sweden. [49] This habit may be a result of crystallization in the presence of cations such as zinc. [50] Magnetite can also be found in fossils due to biomineralization and are referred to as magnetofossils. [51]
One type of black sand is a heavy, glossy, partly magnetic mixture of usually fine sands containing minerals such as magnetite, found as part of a placer deposit. Another type of black sand, found on beaches near a volcano , consists of tiny fragments of basalt .
As of 2019, magnetite iron ore is mined in Minnesota and Michigan in the United States, eastern Canada, and northern Sweden. [8] Magnetite-bearing banded iron formation is mined extensively in Brazil as of 2019, which exports significant quantities to Asia, and there is a nascent and large magnetite iron ore industry in Australia.
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In many places the ore transitions to apparently disorganised ore veins in the country rock. [14] Apatite is by far the main gangue mineral while other gangue minerals are tremolite-actinolite and calcite. [11] Apatite is at places evenly distributed in the magnetite ore, but occurs also as veins and bands. [11]
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But on the Mesabi and Cuyuna Ranges, iron mining operations evolved into enormous open pit mines, where steamshovels and other industrial machines could remove massive amounts of ore. "Large-scale commercial production of magnetite taconite ore on the Mesabi Range started in 1956 at the Peter Mitchell Mine near Babbitt, Minnesota." [2]