The area is underlain by Upper Triassic Nicola Group volcaniclastics and sediments which can be informally separated into the younger Whistle Creek Formation and the older Hedley Formation. The rocks are intruded by Early Jurassic hornblende-bearing diorites of the Hedley Intrusions.

The property is underlain by andesite ash tuff, tuffaceous siltstone, argillite and minor limestone of the Whistle Creek Formation.

Mineralization on the Patsy No. 1 consists of irregular weak fractures in argillites and tuffs which are infilled by pyrite, arsenopyrite, sphalerite with minor chalcopyrite and pyrrhotite in a gangue of quartz and a little calcite. Mineralization is commonly 10 centimetres or less in width and is discontinuous. The main vein in No. 1 adit strikes 030 degrees and dips 40 to 55 degrees northwest, and attains a maximum width of 20 centimetres. In the No. 2 adit, a nearly parallel shear zone, about 10 centimetres in width, hosts mineralization comprised mainly of pyrite with calcite.

In 1937, a sample of the mineralization in the underground stope returned 83.66 grams per tonne gold. A sample from the No. 2 adit returned 3.48 grams per tonne gold. Seventy-five sacks (about 3.6 tonnes) of sorted ore were reported at the foot of the No. 2 dump in 1937. A grab sample of this ore assayed 46.63 grams per tonne gold (Minister of Mines Annual Report 1937, page D5). A 15-centimetre chip sample, taken across the main shear zone exposed in a trench above the No. 1 adit, contained 19.5 grams per tonne gold, 2.9 grams per tonne silver and 1.65 per cent arsenic (Assessment Report 15864, Appendix A, sample R83584).