Located in the mineral-rich Bergslagen district in central Sweden, the Grangesberg iron ore mine was once the third largest in Sweden before its closure in 1989. With significant amounts of iron ore remaining on the site, we conducted a pre-feasibility study and geotechnical assessment to determine the mine’s stability, and likely profitability of reopening it, assessing the site’s hydrology, power and infrastructure requirements, and conducting economic and financial appraisals. Through our work, the client, Grängesberg Iron AB, was granted a mining concession by the Swedish Mining Inspectorate in May 2013 — an important milestone towards re-opening the historic mine.