The Dortatelle occurrence is located about 9 kilometres southeast of Dortatelle Peak (Property File - Canadian Superior Exploration Limited, Maps from Company Files, c. 1973).
The occurrence is hosted by Early Jurassic intrusive rock of the Hogem Plutonic Suite which intrudes undivided Upper Triassic Takla Group volcanics and is truncated, to the west, by the north trending Dortatelle fault.
Mineralization occurs in quartz veins in gneissic granodiorite. The quartz veins are at least "several inches wide" (Geological Survey of Canada Memoir 251). The veins contain molybdenite, pyrite, pyrrhotite and chalcopyrite. A selected sample assayed 0.14 per cent molybdenite (MoS2) and 1.7 grams per tonne silver (Geological Survey of Canada Memoir 251).
The Dortatelle occurrence was discovered during Geological Survey of Canada mapping program prior to 1948, under the direction of C.S. Lord. Lord published the survey's findings as Memoir 251 in 1948.