The Rocky Top occurrence is located 22 kilometres west of Canal Flats in the Golden Mining Division.

The occurrence is within the Creston Formation near the contact with the Upper Aldridge Formation of the Proterozoic Purcell Supergroup (Open File 1990-26).

On the Rocky Top property, the oldest rocks belong to the Upper Aldridge Formation and consist of interbedded black argillite, minor siltstone and bedded white quartzite. The contact with the overlying Creston Formation is gradational and defined as an area where greenish argillite, green siltstone and quartzite predominate. Intrusive rocks consist of metadiorite or diabase sills of the Proterozoic Moyie intrusions. Numerous faults appear to control and localize areas of albitization, sericitization and mineralization.

The sedimentary rocks have undergone regional metamorphism to at least greenschist facies.

Bulldozer trenching has exposed a mineralized zone of approximately 10 metres in width over a 100 metre strike length. The prospect consists of a flat lying, shallow dipping albitized and silicified zone one to three metres thick within siltstone and pyritic argillite of the Lower Creston Formation. The mineralized zone is cut by near-vertical faults with minor left-lateral offsets.

Pyrite, galena, sphalerite and ankerite occur as thin, high grade crosscutting bands and as coarse crystalline aggregates associated with late-stage quartz veins that parallel and crosscut the zone. In addition, mineralized quartz veins also occur within the overlying unaltered black, pyritic argillite. A two metre chip sample taken across the best area of mineralization assayed 3 grams per tonne silver, 1.5 per cent zinc and 0.5 per cent lead (Assessment Report 15195).