The Cat occurrence is situated south of Keen Creek, between Deer and Nashton creeks at 1220 metres elevation above sea level, in the Slocan Mining Division.

Regionally, the area lies on the western margin of the Kootenay Arc, in allochthonous rocks of the Quesnel Terrane. In the vicinity of the occurrence, the Quesnel Terrane is dominated by the Upper Triassic Slocan Group, a thick sequence of deformed and metamorphosed shale, argillite, siltstone, quartzite and minor limestone. Rocks of the Slocan Group are tightly and disharmonically folded. Early minor folds are tight to isoclinal with moderate east plunging, southeast inclined axial planes and younger folds are open, southwest plunging with subhorizontal axial planes. The sedimentary sequence has been regionally metamorphosed to middle greenschist facies.

About 2.5 kilometres west of the occurrence, the Slocan Group has been intruded by the Middle Jurassic Nelson intrusions which comprise at least six texturally and compositionally distinct phases ranging from diorite to lamprophyre. The most dominant phase is a medium to coarse grained potassium feldspar porphyritic granite. Several feldspar porphyritic granodiorite dikes, apparently related to the Nelson intrusions, also cut the sedimentary sequence near the occurrence (Paper 1989-5). The sedimentary sequence has been affected by contact metamorphism from the emplacement of the nearby Nelson intrusions.

Rocks on the property are massive staurolite schist, argillite, quartzite, limestone and argillaceous limestone of the Slocan Group. The rocks strike between 075 and 150 degrees and dip between 40 degrees northeast to 40 degrees southeast. A large north trending quartz porphyritic dike, up to 200 metres wide, cuts the sedimentary sequence in the western part of the claims.

Lenticular quartz veins a few centimetres to more than two metres wide are common, mostly within or peripheral to the quartz porphyritic dike. Most veins are barren except for in the area east of Deer Creek. Here, disseminated argentiferous galena occurs in a vein 0.5 to 2 metres wide. The vein strikes 070 degrees and dips 40 degrees southeast. It has been exposed in a surface trench. A 1.7 metre wide chip sample collected in 1988 assayed 58 grams per tonne silver and 0.24 per cent lead (Assessment Report 17954). The vein has been exposed for 10 metres of strike length in the trench. The vein is hosted within the intrusion near its northern contact with a limestone bed of the Slocan Group.