The Riddarhyttan project is located in central Sweden 150 km northwest of Stockholm. EMX acquired the Riddarhyttan license in 2016 while following up on historic iron mines with associated copper, cobalt and gold mineralization. These mines occur along a ~15 km belt of IOCG deposits with cobalt, molybdenum, REE’s and other metals. Past production was focused on iron, with some copper as well as cobalt and REE’s. Production from Riddarhyttan started in medieval times and has produced intermittently and recently produced iron until 1979. REE, cobalt, molybdenum and zinc mineralization is also developed in vicinity of iron oxide deposits.  

The host rock consists of Paleoproterozoic (1.8-1.9 Ga) metavolcanic and metasedimentary rocks, dominated by rhyolite and interbedded carbonates with extensive sodic-calcic alteration: actinolite-albite (local scapolite) altered metavolcanic rocks (expected source rocks). Calc-silicate (skarn) alteration hosted in carbonate-bearing host rocks, and Mg-rich alteration (anthophyllite–cordierite) associated with massive sulfides.


Regional total magnetic intensity map (project area in red). Broad areas of sodic-calcic alteration characterized by actinolite-albite, local scapolite (sample at left) signify metal leaching (note 10x15 km regional mag low on map). IOCG belts of mineralization and skarn deposits (mag highs) probably focused along structural feeder zones. Click to Enlarge


Hand sample of chalcopyrite (copper mineralization) and hematite from iron mining waste pile. Click to Enlarge
Historic iron mine on the Riddarhyttan project, now flooded. Click to Enlarge