Dannemora Gruvor

Dannemora Mines

Useful Information

Das Eisenbergwerk zu Dannemora (the iron mine at Dannemora). Historic engraving from a German encyclopedia named **Meyers Universum**, published by **Carl Joseph Meyer**. By nn in ca 1850, 15x10 cm.

Location:	Österbybruk
Open:	JUN to AUG
Fee:
Classification:	Iron Mine
Light:	Electric Light
Dimension:
Guided tours:
Photography:
Accessibility:
Bibliography:	Franz Åberg (2015): Mineralogical Study of Manganese Bearing Skarn Minerals and Manganese Content in Magnetite in the Dannemora Skarn Iron Ore Deposit Degree Project, Department of Earth Sciences, Uppsala University. 118 pp. ISSN 1650-6553 Nr 336. pdf
Address:	Dannemora Gruvor, Ånghammarens Turistbyrå, Österbybruk, Tel: +46-295-21492. E-mail:
As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then. Please check rates and details directly with the companies in question if you need more recent info.

History

1481	first mentioned as a silver mine.
1992	mine closed.
2008	plans for reopening the mining due to high prices.
JUN-2012	Storrymningen open cast reopened by the company Dannemora Mineral.

Geology

The Dannemora deposit has 3km in length and some 400 to 800 metres in width. 25 bodies of magnetite ore, with minor zinc, copper and silver. The iron ore of skarn iron type is found in metavolcanics rocks and sediments. As it is low in phosphorus and rich in limestone and manganese, it was the base for the high quality steel from the famous Walloon works.

Description

The Dannemora Gruvor (Dannemora mines) are an area west of Österbybruk with numerous ancient open cast mines and the remains of underground mines. Mining started about 500 years ago and was intensified during the 16th century by King Gustav Vasa. He contracted German miners for their expertise. During the next century miners from Walloonia, Belgium, started mines in the area. The most famous mine owner at this time was the merchant Lois De Geer.

The 17th and 18th century was the heyday of the mine, with the high quality ore having both, the highest content of iron and the highest price. The mines supported more than 30 ironworks in the area. And mining was continued until late in the 20th century, when the mining finally became unprofitable. But with currently rising iron prices, the reopening of the mine in 2008 seems possible.

This area is both a historic site and a mining technology museum. There is a souvenir shop, a craft shop, an antique store and a mineral museum. Visitors may stroll along the various open cast mines, the pits have vertical walls and look pretty impressive. There are some 50 open cast mines. The fantastic abysses made the mining district a popular attraction for painters, writers and royalty from many countries during the 19th century. Carl von Linné visited the mines, and there are numerous historic paintings, in oil and copper engravings.

Storrymmningen is the longest open cast mine in th field, more than 200m long and 100 m deep. It is visited on guided tours, which then enter the underground mine and show the main shaft going down to the 620 m level. The tour ends at a small machine house nearby, which contains the first steam engine of Sweden, which was used between 1728 and 1735 to power the water pumps of the mine.