The Upper Comstock occurrence is located at the head of Cascade Creek at 2635 metres elevation above sea level in the Slocan Mining Division. The property is on the ridge between Cascade and Mat creeks.

Regionally, the area lies within the Selkirk Mountains of southeastern British Columbia. The occurrence is within the Kootenay Arc, a curving belt of highly deformed metasedimentary and metavolcanic rocks which includes the Upper Proterozoic Horsethief Creek Group, the Upper Proterozoic to Lower Cambrian Hamill Group, the Lower Cambrian Badshot Formation, and the Paleozoic Lardeau and Milford groups. The volcano-sedimentary sequence is intruded by numerous Paleozoic to Mesozoic granitoid plutons and has been metamorphosed to at least middle greenschist facies before the emplacement of the mineralization.

The oldest rocks on the Comstock property are andesitic tuffs and flows of the Index Formation of the Lardeau Group. A northwest- trending fault which passes through the centre of the Comstock property separates the volcanic rocks of the Index Formation from sandstone, siltstone and phyllite of the Broadview Formation to the west. The rocks are deformed in a series of northwest-trending folds that are cut at oblique angles by faults.

The Upper Comstock occurrence consists of two vertically dipping quartz veins striking 275 and 295 degrees respectively. The veins consist of white milky quartz sparsely mineralized with disseminated to massive galena with traces of sphalerite. The veins are exposed in a series of surface trenches. A selected grab sample from the mineralized portion of the vein assayed 800 grams per tonne silver and 26.7 per cent lead (Assessment Report 18149).