Implenia Sweden is building a repository for process waste from Boliden's Rönnskär copper smelter in Skelleftehamn. Boliden has awarded Implenia the contract, which essentially consists of drilling and blasting a series of rock excavation chambers with high crack protection, located around 330 m below sea level below the smelter. The contract is the first won by Implenia Sverige AB for the mining industry. The project has a duration of 3 years, starting in January 2018.