The Brock occurrence lies on the southwestern flank of Mount Brock approximately 1.9 kilometres southwest of the peak, about 32 kilometres east of the village of Iskut. The strongly dissected terrain is typical of the Tanzilla Plateau near its southern boundary with the Skeena Ranges.

The prospect occurs in the Stikine Terrane of the Intermontane Belt. Regional geology comprises Carboniferous to Jurassic volcanic arc-related rocks, deposited in the Hazelton eugeosynclinal trough, and Upper Jurassic to Cretaceous clastic sediments (Bowser Lake and Sustut groups) deposited in the Bowser Basin. Middle Jurassic and older rocks have been intruded by granitic to dioritic bodies belonging predominantly to the Late Triassic to Late Jurassic Hotailuh batholith. Within the Bowser Basin, regional-scale faults and folds have a northwest trend in response to a northeast-southwest contraction.

Mapping indicates that Lower Jurassic Mount Brock Volcanics (Hazelton Group) underlie the property. Units are described as interbedded maroon, grey or green, aphanitic to plagioclase porphyritic andesite and basalt which form flows, breccia and minor tuffs. At the showing, these units are intruded by Early Jurassic biotite-hornblende leucogranite of the McEwan Creek pluton. Local bedding strikes from 280 degrees to 010 degrees and dips from 24 degrees east to 65 degrees southwest with an average attitude of 330 degrees strike and sub-vertical dip.

Two shallow trenches totalling six metres have exposed two mineralized quartz veins within the intrusion. Surrounding hostrocks (0.3 to 0.5 metre envelope) are silicified and partially replaced by kaolinite. Chalcopyrite, bornite, and pyrite occur as disseminations and veinlets within the siliceous zones. Grab samples from the mineralized zones assayed upwards of 1.57 per cent copper, 5.8 grams per tonne silver and 0.27 gram per tonne gold (Assessment Report 8432). The mineralization along a 500-metre strike length is discontinuous and disrupted by black aphanitic dike swarms.

A gossanous zone in a highly altered intrusion and volcanic rock containing pyrite and trace malachite has been noted along McEwan Creek, 1 kilometre south of the trenches.

The property was briefly explored in 1977 and 1980, during which time geological mapping, trenching, and minor lithogeochemical sampling was conducted.

In 1991, geological mapping and sampling was performed by International Corona Corp. personnel; 68 rock, 4 whole rock, 42 moss mat, and 1 silt sample were collected.