Lokken

Location

The Løkken Cu-Zn deposit is considered to be the largest ophiolite-hosted VMS (i.e. Cyprus type) in the world. Approximately 24 Mt grading 2.3% Cu, 1.8% Zn, 0.02% Pb, 16 g/t Ag, and 0.2 g/t Au was mined over a period of 333 years from 1654 to 1987. The deposit consists of massive sulphide ore predominantly of pyrite with subordinate chalcopyrite and sphalerite, whereas galena, magnetite, haematite and bornite are minor components locally and fahlore is the most important accessory phase.

The total length of the deposit is approximately 4 km with an average width of 150 to 200 m, and an average thickness of 50 m. An extensive feeder-zone system associated with the massive sulphide mineralisation occurs along the entire length of the deposit. Sulphide veins vary in thickness from mm to 10cm.