The Sitting Bull occurrence is situated on Bruce Creek at 2300 metres elevation above sea level in the Golden Mining Division. The property consists of a single Crown grant (Lot 4097).

Regionally, the area is underlain by Proterozoic clastic sedimentary rocks of the Purcell and Windermere supergroups and by lower Paleozoic strata of the Beaverfoot and Mount Forster formations (Geoscience Map 1995-1).

The Purcell Supergroup strata include the Aldridge, Creston, Kitchener, Dutch Creek and Mount Nelson formations. The Windermere Supergroup unconformably overlies the Purcell Supergroup rocks and includes the Toby Formation and Horsethief Creek Group (Paper 1990-1).

In the vicinity of the occurrence, rocks of the Kitchener and Dutch Creek formations have been further subdivided and assigned to the Van Creek and Gateway formations. The Van Creek Formation correlates with the Lower Kitchener Formation while the Gateway Formation is equivalent to the lower portion of the Dutch Creek Formation. The Mount Nelson Formation has been subdivided into seven discrete members, a lower quartzite, a lower dolomite, a middle dolomite, a purple dolomite, an upper middle dolomite, an upper quartzite, and an upper dolomite (Open File 1990-26).

Rocks of the Horsethief Creek Group, Beaverfoot and Mount Forster formations are folded and overthrusted by rocks of the upper portion of the Dutch Creek Formation and the lower members of the Mount Nelson Formation. The sedimentary rocks have undergone regional metamorphism to at least greenschist facies.

The prospect consists of galena and stibnite occurring in 5 to 30 centimetre wide quartz veins which are emplaced parallel to the bedding of the host Mount Nelson dolomite (Minister of Mines Annual Report 1915). The prospect has been explored with several adits and a vertical shaft driven to a depth of 25 metres. In 1919, 12 tonnes of high-grade ore was mined from the workings to produce 32,472 grams of silver and 3841 kilograms of lead.