The Hudson Bay Mountain area is underlain by Lower-Middle Jurassic volcanic rocks of the Hazelton Group. The Mamie occurrence is underlain by massive to flow banded white to grey spherulitic rhyolite and variegated green andesitic to dacitic flows and flow breccia which strike 135 degrees and dip between 30 to 45 degrees northeast. Also, a grey polymictic volcanic breccia of unknown attitude hosts angular to subangular clasts of felsic volcanics.

Three main groups of felsic intrusions have been recognized, a porphyritic granodiorite of the Middle-Late Cretaceous Bulkley Intrusions and Early Tertiary mafic dikes followed by the emplacement of a series of felsic stocks and dikes. Mineralization in the area seems to be genetically related to the Tertiary porphyry intrusions.

The mineralization consists of polymetallic, fissure-filling veins which are related to and radiate from a central molybdenum porphyry system that occurs to the northeast of the property. It is associated with a sheared and brecciated zone striking 070 degrees with a steep southeast dip in andesitic flows and breccias and consists of sphalerite and arsenopyrite with a little chalcopyrite and rarely galena. On surface the zone is 0.6 to 2.4 metres wide over an exposed length of about 100 metres. A shipment of 13.04 tonnes of ore in 1941 averaged 33.26 grams per tonne gold, 140.57 grams per tonne silver, 0.90 per cent copper and 11.2 per cent zinc (Minister of Mines Annual Report 1941, page A41).

Drilling around the old mine workings in 1985 intersected a 1.0- metre section grading 16.46 grams per tonne gold, 78.86 grams per tonne silver, 10.7 per cent zinc and 0.73 per cent copper. Another 3.5-metre intersection assayed 2.06 grams per tonne gold, 18.5 grams per tonne silver, 3.9 per cent zinc and 0.13 per cent copper (Property File - Consolidated Silver Standard Mines Ltd., Mamie Property 1988 Mine Plan).

Proven reserves for the Mamie property are 55,330 tonnes grading 10.97 grams per tonne gold, 102.84 grams per tonne silver, 7.0 per cent zinc and 0.7 per cent copper (Vancouver Stock Exchange Offering of Rights July 17, 1985 - Consolidated Silver Standard Mining Ltd.).

Metallurgical testing on bulk samples from the Mamie vein indicate that conventional flotation or cyanidation methods to attain economic concentrate are not possible.