The unit is managed via the Mining Europe unit, based in Sweden. In the Skelleftea Field, mineralisation is found in Precambrian supracrustal rocks that have been structurally deformed by granite intrusions. Typically, complex sulphide deposits occur at the boundary between volcanic and sedimentary rocks, often at considerable depth. Consequently, despite the area having been explored for more than 70 years, deposits continue to be identified. In 1990 Boliden allocated SEK250 million for exploration here, aiming to define sufficient reserves for mining until 2015.
Contractors work the open-cuts, using conventional techniques.
The redesign introduced autogenous grinding, large flotation cells, pressure filtration and a process information system, Nordic manufacturers supplying most of the equipment. New flotation and process control technologies have subsequently been introduced. As of January 2000, Boliden was awaiting permits to cyanide leach Einarsson ore. Location map for Boliden Area Operations. The tunnel between the Petikn s and Renstr m mines.