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Topic: Taconite


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  taconite - HighBeam Encyclopedia   (Site not responding. Last check: 2007-11-01)
TACONITE [taconite] low-grade iron ore, a flintlike rock usually containing less than 30% iron.
Experiments begun in 1912 by the American scientist Edward W. Davis and continued by him for nearly 40 years produced the pelletizing method for upgrading the ore. The development of the jet piercer (a high-temperature flame thrower) provided penetration speeds of up to 40 ft (12 m) an hour for blasting holes in the rock.
In 1956 exploitation of the vast reserves of taconite in the Mesabi range of Minnesota was begun by some of the largest steel companies in the United States.
www.encylopedia.com /html/t/taconite.asp   (355 words)

  
 Iron - Facts, Information, and Encyclopedia Reference article
Iron is one of the more common elements on Earth, making up about 5% of the Earth's crust.
Most of this iron is found in various iron oxides, such as the minerals hematite, magnetite, and taconite.
The earth's core is believed to consist largely of a metallic iron-nickel alloy.
www.startsurfing.com /encyclopedia/i/r/o/Iron.html   (2747 words)

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