A simplified sequence of the main mineralization consists of three main geological rock units. Stratigraphically below the footwall is a chlorite, epidote and carbonate rich mafic volcanic containing smaller amounts of disseminated sulphides (pyrite and pyrrhotite), displaying pillow structures in places. This unit is in contact with the immediate footwall composed of a keratophyre, at first with albite-chlorite alteration that grades into a quartz-sericite-talc and albite altered variation with varying quantities of chlorite and sulphides. The hanging wall is composed of mafic and intermediate tuffs, which are partly fine-laminated and contain disseminated sulphides (pyrite and pyrrhotite). Intermediate rocks of lava/intrusive character also occur in the hanging wall as well as thinner bands of unaltered keratophyres. Stratigraphically above the hanging wall the chlorite, epidote and carbonate mafic volcanic appears again, indicating a repetition of the stratigraphy. A magnetite bearing laminated mafic tuff acts as a good marker horizon and can be traced throughout the area.

Skiftesmyr has been affected by four deformation events all related to compressional pure shear during the Caledonian orogeny, D1 to D4. This has produced a very complex structural history of the mineralization. D3 and D4 are interpreted to give the area its regional expression while D1 and D2 are today displayed in smaller scale.

In Skiftesmyr Chalcopyrite (copper) and Sphalerite (zinc) occur in a pyrite dominated massive sulphide body. The mineralized body occurs as a folded continuous sheet with varying thickness and is known to a depth of 400 meter. The mineralization is still open.