The Silver Crown showing is located in a glacial cirque at the headwater of Chimdemash Creek. The Silver Basin rises from 1,200 to 1,350 metres above sea level.

Andesite flows of the Jurassic Hazelton Group are intruded by quartz diorite dikes, probably related to a nearby diorite stock of the Coast Plutonic Complex. The volcanics, which strike southeast and dip steeply, are cut by quartz veins mineralized with tetrahedrite, chalcopyrite, chalcocite and pyrite.

One of the veins, striking 135 degrees and dipping 75 degrees southwest is 45 metres long and 7 to 17 centimetres wide. A 17.8 centimetre channel sample assayed 150.2 grams per tonne silver, 0.7 grams per tonne gold and 1.24 per cent copper (Geological Survey of Canada Memoir 212). A parallel vein, 60 metres to the northeast is 6 metres long and 13 centimetres wide. A sample across the vein assayed 1309 grams per tonne silver, 0.7 grams per tonne gold and 7.66 per cent copper (Geological Survey of Canada Memoir 212). A 15 centimetre sample of a vein 750 metres to the northwest, at the pass, assayed 1858 grams per tonne silver, 0.3 grams per tonne gold and 26.66 per cent copper (Minister of Mines Annual Report 1924).