The Lisa occurrence is situated at 1833 metres elevation above sea level, 3.25 kilometres south of Black Diamond Peak in the Purcell Mountains, in the Golden Mining division.
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 Lisa occurrence is hosted within dolomite of the Gateway Formation. Economic mineralization occurs in quartz and barite veins in dolomite, dolomite breccia and quartzite. Galena, tetrahedrite, sphalerite and talc chalcopyrite occur as pods or crystals in veins. Some sulphides with no gangue occur as stockworks in dolomite breccia or as massive pods. A 9-metre chip is reported to have yielded 30.86 grams per tonne silver, 2.1 per cent copper, 0.48 per cent lead, 0.63 per cent zinc (McMillan, 1968 (Property File)).
