The Mussen showing is located on the southwest slope of Mount Mussen, 22 kilometres southwest of Atlin.

The Mussen area is underlain by amphibolite gneiss with occasional thin zones of chlorite schist conformable to the gneissic foliation; other mapping suggests that the amphibolite gneiss is a minor component with the main part being metasedimentary in nature (Assessment Report 2977). The BC Geological Survey prefers the term greenstone or greenschist metamorphic rock for this area - possibly deformed Mississippian to Triassic Stikine Assemblage rocks. These metamorphic rocks are intruded by porphyritic granodiorite east and north of the claim group. One large fault occurs within the gneisses close to the granodiorite contact. This fault and numerous smaller fractures are strongly gossaned due to injections of ferruginous carbonate. Occasional small quartz veins containing trace amounts of visible chalcopyrite intrude the gneisses. These discontinuous veins are all less than 30 centimetres wide; most are between 2 and 5 centimetres wide.

Wolframite was reported to have been previously found in these veins but was not observed in 1970 and therefore was thought not to be abundant. Locally, impressive surface coatings of malachite were frequently traced to tiny insignificant concentrations of chalcopyrite in quartz veins. A slightly greater abundance of malachite and of copper-bearing quartz veins was reported to occur downslope from the major cirque, coinciding with the zone of most noticeable hydrothermal alteration.

The amphibolite gneisses and porphyritic granodiorite appear to be barren of significant sulphides. The contact between the two major rock types is also unmineralized. The faults and minor fractures, although strongly gossaned, are unmineralized.

WORK HISTORY

Cominco held the Mussen 1-2 claims in 1970 and conducted geological mapping (Assessment Report 2977). The showing was covered by the Willison Bay property of Pacific Sentinel Gold Corp in 1989. In 1989, Pacific Sentinel conducted prospecting in three main areas of their Willison Bay project (Atlin Lake): (a) the area near the West Bay of Torres Channel, directly north of the Laverdiere (104M 022) showings, in the vicinity of the Callaghan veins (104M 021); (b) the southwest portion of the property; and (c) the southeast portion of the property from the eastern border down to Hoboe Creek where the Mussen showing is located. The Mussen showing, which is reported to be situated in the southeast corner of the Willison Bay property, was not located in 1989, possibly due to forests resulting in thick cover and very steep terrain.