The Black Douglas lead-zinc showing is located on the south slope of Hughes Creek, in granite of the middle Cretaceous Bayonne batholith about 50 metres downslope from the same contact with schists as passes through the Wisconsin property (082FSE036) to the west. The country rocks adjacent to the granite are highly metamorphosed through both regional and contact metamorphism to amphibolite facies (staurolite-kyanite according to Map 1714A of the Geological Survey of Canada), but are mapped as belonging to the Monk Formation of the Upper Proterozoic Windermere Supergroup.
Mineralization consists of quartz veins with bunches of galena and sphalerite, narrow in the schist and more persistent within the granite. The main fracture trends 070 degrees in the granite and is covered with a gossan rich in manganiferous oxides (grade up to 11 per cent manganese) and enriched in gold (a channel sample assayed 22 grams per tonne gold, 237 grams per tonne silver and 1.88 per cent manganese across 1.6 metres) (Minister of Mines Annual Report 1946, page 149). In places, the quartz is mineralized with arsenopyrite, but it does not contain gold.