The area of the Giant East occurrence is underlain by Upper Triassic Stuhini Group metasediments and volcanic, and undivided volcanic rocks of the Pennsylvanian Stikine Assemblage. A quartz vein, less than 1 millimetre thick, occurs in rusty orange weathered, dark grey phyllite. Sulphides identified were pyrite, chalcopyrite and lead. A sample assayed 0.425 gram per tonne gold, 35.5 grams per tonne silver, 0.04 per cent copper, 0.71 per cent lead and 0.63 per cent zinc and 0.07 per cent arsenic (Sample W385655, Assessment Report 37140).

A few hundred metres to the southwest of Sample W385655 a 6-metre outcrop of volcanic rock is exposed by a glacial waterfall. Multiple rusty areas with sulphides (up to 30 per cent) are visible on the surface. An assay of this material graded 0.075 gram per tonne gold, 14.4 grams per tonne silver, 5.72 per cent zinc, 0.11 per cent copper and 0.02 per cent lead (Sample W385546, Assessment Report 37140).