Restored nineteenth-century timber headframe over Storgruvan at Bersbo, a copper mining heritage site near Åtvidaberg open for guided visits.
Bersbo, Storgruvan is the principal shaft of the Bersbo copper mining field in Östergötland, a few kilometres north of Åtvidaberg. Copper extraction at the site began in the sixteenth century, with a privilege letter from 1413 providing the earliest documentary evidence of mining in the area. In the 1850s and 1860s Bersbo was the most productive copper works in Sweden, and the Baroniet Adelswärd family held ownership of the complex from 1781.
The timber headframe over Storgruvan was erected in 1870–1871 at the height of the operation, designed by builder Lars Eric Filin, and is of the square lavkur type. Mining in Storgruvan continued until 1893. Total copper production at Bersbo over its active history amounted to approximately 35,000 tonnes.
The Bersbo copper works closed definitively in 1902. The headframe, owned by Åtvidabergs kommun, has been restored and forms a centrepiece of a heritage area forming part of Ekomuseum Åtvidabergs Bruksbygd. Guided tours of the site are offered by Föreningen Bersbo koppargruvor.
The Bersbo copper field in Östergötland lies close to the town of Åtvidaberg. Tradition holds that the ore was discovered in the late fourteenth century by a herdswoman named Katarina, though the earliest documentary evidence of organised mining is a privilege letter of 1413. The initial shaft carrying the name Katarinagruvan was later renamed Storgruvan as the field expanded and additional openings — including Bondgruvan and Steffenburgsgruvan — were sunk to work the same ore body.
Mining was under way in the sixteenth century, with Bishop Hans Brask among the early operators. In 1781 the entire copper works passed into the ownership of Johan Adelswärd and his wife, who established the fideikommiss known as Baroniet Adelswärd, an entity that would continue to control the Bersbo complex and other mineral properties in the county. The settlement of Bersbo grew up around the working, at its largest housing around 1,200 people simultaneously.
In the 1850s and 1860s the Bersbo copper works was regarded as the most productive in Sweden, described by contemporaries as Sweden's second most important copper producer after Stora Kopparberg in Dalarna. The record year of 1865 saw the shaft reach approximately 357 metres in depth; in that year 11,500 cubic metres of rock were broken out, yielding 10,700 tonnes of smeltable ore and 400 tonnes of copper. Nitroglycerin was used experimentally at Bersbo from the autumn of 1865, making it among the earliest mines in Sweden to adopt the technique.
To facilitate transport of ore from Bersbo to the smelting works in Åtvidaberg, Östergötland's first locomotive-operated railway was opened in 1857 between the two settlements; the two locomotives were named Åtvidaberg and Bersbo. Copper produced at Bersbo was awarded a prize at the Paris World Exhibition of 1889. The timber headframe over Storgruvan was constructed in 1870–1871, designed by the builder Lars Eric Filin, who had moved to the district in 1862.
It is of the lavkur type — square in plan and of moderate height — and is considered a fine example of a late-nineteenth-century Swedish industrial building in timber. Its light-coloured paintwork appears to have been the original scheme. The headframe was in use until 1893, when extraction in Storgruvan ceased.
As ore quality and quantities declined in the final decades, a further attempt was made to secure the future of the works through the sinking of Adelswärds schakt, but production there also proved limited. In 1902 the Åtvidaberg Kopparverk ceased all industrial copper operations, marking the end of Bersbo as a working mining community. Sammanlagt togs det upp ca 35,000 ton kopparmalm under åren i Bersbo.
The headframe over Storgruvan passed into the ownership of Åtvidabergs kommun and was subsequently restored. It now forms the centrepiece of the heritage site at Bersbo, which includes the nearby Adelswärdska lave and ancillary surviving buildings. Together the structures form part of Ekomuseum Åtvidabergs Bruksbygd, and Föreningen Bersbo koppargruvor manages guided tours of the site and ongoing conservation works.
The land at Bersbo remains in the ownership of the Adelswärd family.