The Thor occurrence is located approximately 4 kilometres northeast of the north end of Thorne Lake about 173 kilometres north-northwest of the community of Germansen Landing.

The showing is hosted in Upper Triassic Takla Group silicified andesites, hornblende andesites and dacites near a syenitic dike. The rocks are bounded to the west by the north trending Moose Valley fault and Middle-Upper Cretaceous Sustut Group sedimentary rocks. To the east, the hostrocks are bounded by an Early Jurassic quartz monzodiorite.

Mineralization consists of sparse chalcopyrite and molybdenite in fractures and quartz veins cutting the country rock.