EMX’s Sanna Project covers a large area between Örnsköldsvik and Sundsvall in south-central Sweden and targets the Ulvö layered mafic intrusive complex. Although the Ulvö complex (1.27-1.25 Ga) hosts known economic concentrations of Fe-Ti oxides in the Norrland archipelago, the remainder of the intrusion has not been assessed for Ni-Cu-Co-PGE mineralization and has seen no modern exploration.
The intrusions appear to have been mainly emplaced as sills, some of which have rudimentary layering characteristics, however, some may represent feeder dikes. Of greatest interest, however, are brecciated masses of sulfide-rich mineralization that have been injected into country rocks near the margins of some of these intrusions. Some of these brecciated “injection veins” were mined historically in the 18th and 19th centuries and possibly again during WWII.
EMX geologists observed three of these vein/breccia structures at the Förtnätra Prospect and recognized that similar features are seen in footwall environments in some large nickel sulfide deposits. Sampling of the three veins showed two of them to be enriched in Ni-Cu-PGE (~0.5% Ni, 0.5% Cu, 0.05% Co and 1-2 g/t Pt+Pd).
Another key observation is that the intrusion in shown to cut sulfide-rich sediments in at least one area. LKAB (a Swedish state-run mining company) noted chalcopyrite and pyrrhotite rich boulders in this area. To our knowledge, however, no company has assessed this area for nickel sulfide potential, although there are clear signs it is present.