The Portage showings are located near Border Peak, south of the Scud River and just east of the Stikine River. The Portage is underlain by the "Pereleshin Pluton" which is an Early Jurassic body of the Texas Creek Plutonic Suite, composed primarily monzodioritic to gabbroic intrusive rocks. Andesitic plagioclase-hornblende dikes and narrow aplite dikes of inferred Tertiary age (Paleocene to Eocene Sloko-Hyder Plutonic Suite) are abundant. The mafic dikes generally occur along steeply dipping, northwest trending faults. A Pennsylvanian to Lower Permian roof pendant of the Stikine Assemblage is exposed in the occurrence area. These rocks consist of a sedimentary sequence, made up of mainly limestone, meta-argillite, meta-siltstone, ash tuff and calcareous siltstone, and a volcanic sequence made up of foliated meta-volcanics, andesitic flows, volcaniclastics and tuffs.

Quartz-carbonate veins, generally from 1 to 10 centimetres in width, occur along fractures within quartz monzonite. Several of these veins were observed to contain chalcopyrite, malachite, azurite, sphalerite and galena. A high-grade sample (Sample 93285) taken from a 5.0 centimetre wide polymetallic quartz vein assayed 4.53 grams per tonne gold (Assessment Report 20704). Southwest of these showing, about 500 to 700 metres, several more gold-bearing polymetallic quartz veins were sampled.

In 1990 the Mount Pereleshin property was explored by West Sea Development Corp., under option from Goldbelt Mines Inc. Besides conducting mapping and prospecting, West Sea collected 13 heavy mineral samples, 137 rock samples and 44 silt samples. A total of 47 mandays were spent on the property during the 1990 exploration program. There is no record of any other previous work that has been carried out in this claim area.