The Cascade occurrence is located within a few hundred metres of the beach at Kildonan, Uchucklesit Inlet, 30 kilometres southwest of Port Alberni.

The area is underlain by the contact of Upper Triassic Vancouver Group, Quatsino Formation limestone and volcanics of the Lower Jurassic Bonanza Group.

Locally, a diabase dyke (andesite) intrudes limestone and is impregnated with chalcopyrite and iron pyrite (pyrrhotite?). The deposit is also reported to be associated with skarn material made up of garnetite, epidote, hornblende and quartz and is described as a vein.

The deposit was mined in 1904 and 1905 produced 113 tonnes of ore, which contained 14,629 kilograms of copper and 3,235 grams of silver (Mineral Policy data). Most of the ore was taken from an open cut on the surface showing. A short tunnel was driven under the open cut but encountered little ore. One selected sample assayed 2.06 grams per tonne gold, 4.11 grams per tonne silver and 5.5 per cent copper (Minister of Mines Annual Report 1906).

In 2007 through 2013, Nahminto Resources completed a program of prospecting, geological mapping, geochemical sampling, a ground magnetometer survey and airborne geophysical surveys on the area as the TJM claims, a part of the Nahmint property. In 2013 Equitas Resources Corp. conducted geological mapping, rock, soil and stream moss mat sampling at the Three Jays North area of the Nahmint property.

In 2020 a structural analysis via photo interpretation and minor prospecting and stream and rock sampling were conducted on the Nahmint property for tenure holder B. McKinney.