The White Cat mine is located near the headwaters of Bruce Creek at 2287 metres elevation above sea level in the Golden Mining Division. The property consists of a single Crown grant (Lot 7555).
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 occurrence is within the middle dolomite member of the Mount Nelson Formation below a north trending overthrust fault that separates the Mount Nelson and Dutch Creek formations (Open File 1990-26). Mineralization is associated with a quartz vein 0.6 to 2.5 metres wide that follows an open gouge zone for 75 metres along strike. The vein strikes 050 degrees and dips 70 degrees northwest. Massive galena with minor tetrahedrite occurs throughout the vein in lenses 2 to 3 metres long and 0.5 metre wide. The vein has been developed with several small adits and trenches. Limited production between 1924 and 1928 yielded 154,893 grams of silver and 80,644 kilograms of lead from 152 tonnes mined.