The Sam-Main Glacier area is underlain by Paleozoic(?) meta- sediments which are intruded by quartz feldspar porphyry and mafic dykes. A train of mineralized bounders at the base of the "Main Glacier", on its west side, is 10 to 20 metres wide and at least 200 metres long. The boulders include massive garnet-diopside-actinolite skarn which contains up to 5 per cent copper and 5 per cent zinc, as chalcopyrite, sphalerite, and crudely banded, fine-grained massive sulphides in a quartz-actinolite(?) gangue. Samples assayed up to 5.8 per cent copper, 12.4 per cent lead, 14.3 per cent zinc, 150.86 grams per tonne silver, and 0.07 grams per tonne gold. The only in-situ mineralization occurs just above the northeast side of the glacier, and consists of quartz-rich skarn bands with minor copper mineralization.