Strata underlying the region of the J showing, from oldest to youngest, include: quartzite and dolomite of the Middle Proterozoic Mount Francis Formation (Purcell Supergroup); conglomerates and coarse clastic sediments of the Upper Proterozoic Toby Formation (Windermere Supergroup); slates, quartzites, grits and conglomerates of the Upper Proterozoic Horsethief Creek Group; argillite and dolomite of the Cambrian to Ordovician McKay Group; dolomites of the Cambrian Jubilee Formation; dolomite, shale, sandstone and quartzite of the Ordovician to Silurian Beaverfoot Formation; argillite, argillaceous limestone and quartzite of the Middle Devonian Mount Forster Formation; and thin to medium-bedded biowacke stones of the Upper Devonian Starbird Formation. The strata form a broad, north plunging anticline, with numerous minor folds generally overturned to the east.

Antimony-copper-lead mineralization was explored in 1967 by Kodiak Mines Limited. Mapping and sampling were carried out.

The mineralization is erratically distributed in a flat-lying white limestone conglomerate near the top of a very steep rocky ridge. Mineralization is exposed for a distance of 40 metres in a north-south direction and approximately 52 metres in a southwest direction on the opposite side of the ridge. One local, shown on a Kodiak map, shows that antimony (presumably stibnite) is associated with a barite vein. Elsewhere it occurs as pods in conglomerate. Pertinent documents did not discuss mineralogy.