Topics and projects,

Deep repository project for Rönnskärsverket finalized

In Rönnskär outside Skellefteå in the northern part of Sweden, Implenia Sweden built a unique deep repository for process waste from Boliden's copper smelter, constructed 350 meters below Boliden's Rönnskärsverk during the years 2018-2021. A deep repository is not a typical infrastructure project but a very special and challenging project.

Rönnskär in Skelleftehamn is one of the world's most efficient copper smelters. The a high-tech metal company Boliden extract primarily copper, gold and silver from own mines and from external suppliers. Rönnskär is their biggest production unit and the biggest private employer in the region.

The contract was approved at its final inspection on the 16th of November in 2021, and de-establishment will now take place in January. Our internal project completion and experience feedback will take place during January / February 2022.

“With high accuracy and great care, we have drilled and blasted a number of large rock chambers with great care for the surrounding rock mass, approximately 330 m below sea level under the smelter. A total of 345,000 m3 of rock has been blasted out and transported 3 km up to the surface via an existing ramp tunnel", says production manager David Andersson.

"The collaboration with the project's client, Boliden, has been very successful throughout the project and they expressed at the final inspection that they considered the project to be - a very well done job", says David.

Deep repository for Rönnskärsverket in figures

1,212 meters of storage room divided into 8 storage rooms. In addition to this, connection types, gallery tunnels, pallet tunnels, laundry halls, technical niches and pump pits of a total of 1,268 meters have been operated. All in all, 2,480 meters in very varying sizes. The rooms are 18 meters high and 16 meters wide with varying lengths from 50 to 240 meters.