The Chief of the Selkirks prospect is located near the headwaters of Bobbie Burns Creek in International Basin, about 32 kilometres southwest of Golden.

The occurrence is located in the Purcell Mountains and is underlain by northwest trending metasediments of the Upper Proterozoic Horsethief Creek Group. Regionally, this group consists of slates, argillites, quartz-pebble conglomerates, grits and minor limestone.

The formations in International Basin, as well as the adjoining main valley, are folded and fractured across the bedding. Rock types include greenish grey schists, dark slaty schists (in which cubes of pyrite are a characteristic feature), quartzites, slates and conglomerates. In the bluffs and ridges it is evident that the formations have been folded to form a large anticline. Cutting the metasediments are a series of well-defined quartz veins trending north and south. These are intersected by another series of quartz veins trending about 300 degrees. Mineralization occurs at the intersection of the two vein systems. Mineralization in the veins consists mainly of galena and pyrite. However, pyrite is described as occurring in massive form or irregularly disseminated throughout the quartz.

On Crown grant claim International(L.661), there is a tunnel 24 metres in length and several open cuts. There are at least two quartz veins cutting through the Crown grant claim. These are traceable on the surface over 60 metres trending 305 degrees. One quartz vein carries galena, tetrahedrite and pyrite. The pyrite carries gold.