Heavy minerals in stream sediments,Southwest Norway

As part of a regional prospecting programme, 600 panned stream sediment concentrates from 1000 km² have been examined for scheelite (CaWO₄) using ultraviolet light. The mineralogical compositions of the heavy mineral concentrates were determined and related to bedrock geology. The results of the investigation are presented on maps showing the distribution of scheelite, magnetite, and ilmenite. Follow-up work resulted in the discovery of nine new tungsten occurrences. Magnetite dominates in areas of acid rocks, and ilmenite in areas of basic rocks. The areal distribution of hornblende and hypersthene reflects the metamorphic grades.