The Kass occurrence is located about 98 kilometres east-southeast of Dease Lake.

In the area of the showing, Upper Permian to Lower Triassic Kutcho assemblage mafic to felsic metavolcanic and metasedimentary rocks underlie Upper Triassic Sinwa Formation limestone and Lower Jurassic Inklin Formation sediments and metasediments. The area is interpreted to have been isoclinally folded during formation of the King Salmon allochthon in Early to Middle Jurassic time. The Sinwa Formation has recently been assigned to the Stuhini Group (Stikine Terrane), and the Inklin Formation to the Laberge Group (Overlap Assemblage). For details on the new Kutcho assemblage age date see Kutcho (104I 060).

The exposed rocks are mainly foliated chloritic and sericitic schists, phyllites and quartzites which are thought to be metamorphosed mafic and felsic volcanic rocks. These rocks are overlain by fine grained argillaceous sediments and massive bedded limestone. Hornblende diorite and subvolcanic porphyritic dikes intrude the strata. Diabase dikes and quartz diorite also intrude the sediments. The strata strikes northwest and dips steeply northeast.

The showing is located in the north face of a prominent peak and consists of 0.5 to 1 metre beds of pyrrhotite with minor disseminated chalcopyrite and sphalerite. The sulphides display fine 0.5-millimetre laminations and beds of chaotic breccia suggesting a sedimentary origin. Samples yielded up to 0.11 per cent copper, 0.17 per cent zinc, 6.17 grams per tonne silver and 0.12 gram per tonne gold (Assessment Report 11314).

This showing was first described and explored in 1982 and 1983 by Canamax Resources Inc. The company performed mapping, a magnetometer survey and collected 989 soil samples. No further work is documented.