Dannemora is the location of an important iron ore mine, which formed the basis of the iron industry in Uppland. Östhammar Municipality ( Östhammars kommun) is a municipality in Uppsala County in east central Sweden. Uppsala County ( Uppsala län) is a county or Län on the eastern coast of Sweden. "Sverige" redirects here For other uses see Sweden (disambiguation and Sverige (disambiguation. Year -of the Julian calendar. The Gregorian calendar was 11 days ahead of the Julian calendar until Friday, but 12 days ahead since Saturday. Iron ores are rocks and Minerals from which Metallic Iron can be economically extracted Uppland ( is a historical province or landskap on the eastern coast of Sweden, just north of Stockholm, the capital It provided the raw material for about 20 finery forges that produced bar iron for export. Iron tapped from the Blast furnace is Pig iron, and contains significant amounts of Carbon and Silicon. QtubIronPillarJPG|thumb|right| Iron pillar at Delhi India containing 98% wrought iron]] Wrought iron is commercially pure Iron. In England, iron produced from Dannemora ore, was known as oregrounds iron, after the port town of Öregrund. The English term Oregrounds iron takes its name from the small Swedish city of Öregrund. Öregrund is a town (pop 1500 in Östhammar Municipality, Uppsala County in eastern Sweden. It was considered the best raw material for producing blister steel by the cementation process. The cementation process is an obsolete technique for making Steel by Carburization of Iron. The cementation process is an obsolete technique for making Steel by Carburization of Iron.
In 1878 a narrow gauge (891 mm) railway was opened to the port in Hargshamn, and iron ore started to be exported directly. A narrow gauge railway (or narrow gauge railroad) is a Railway that has a Track gauge narrower than the of Standard gauge railways Iron ores are rocks and Minerals from which Metallic Iron can be economically extracted
The mine was closed down in 1992. With world market demand rising, the feasability of reopening the mine is being invsetigated (as of may 2008).