The Storwartz deposit, which produced around 1.62 Mt, was the largest in the Storwartz ore field and was worked by two mines, the Old Storwartz Mine and New Storwartz Mine during the period 1645-1919. The Quintus, Hestkletten, Olav and Solskinn deposits also occur within the Storwartz project area, which collectively produced about 2.1 MT during the period 1660-1972, with the majority being produced from the Olavs mine, which was the last in the Storwartz ore field to be mined.
Mineralisation consists mainly of pyrrhotite and sphalerite, with substantial amounts of galena. Main non-sulphides are calcite, plagioclase, quartz and chlorite, whereas sericite and biotite are subordinate phases. Strong deformation of the ore is evident in many places in the form of rounded fragments of psammite, and of plagioclase crystals.
Taking the Storwartz ore field as a whole, the deposits from east to west show a very distinct pattern with respect to zonation in the base metals from Cu-rich deposits in the east (Solskinn, Olav and Quintus) grading into Zn- and Pb-rich deposits in the west (Old Storwartz Mine and New Storwartz Mine). Together with the presence of an extensive and continuous chlorite alteration zone beneath the deposits, this is an argument in favour of the ore bodies in the Storwartz field originally being one deposit, with the zonation reflecting distance from the high T vent site(s).