The C occurrence is located on the southwestern shore of McClinchy Lake.

The region is underlain to the west by the Coast Crystalline belt and to the east by Mesozoic and Tertiary volcanic and sedimentary rocks. A hybrid zone along the eastern margin of the Coast Crystalline Belt contains elements of both terranes. In this zone Mesozoic rocks have been incorporated into the plutons and are overlain by Tertiary volcanic rocks. The degree of metamorphism and deformation of the Intermontane Belt supracrustal rocks increases towards the Coast Crystalline Belt.

The showing occurs within the hybrid zone, where volcanic rocks, probably part of the Jurassic Hazelton Group, have been intruded and metasomatized by diorite and quartz monzonite. Breccia pipes containing sulphides are present in the area. In 1973, drilling encountered mainly quartz diorite with minor disseminated chalcopyrite, pyrrhotite, pyrite and magnetite. Drill samples yielded values up to 0.01 per cent copper and trace molybdenum over 3.0 metres (Assessment Report 5163).

In 1972, Cardwell Resources completed 10.5 line-kilometres of a combined airborne electromagnetic survey on the area as the McClinchy property. In 1973, Rio Tinto completed two diamond drill holes, totalling 119.0 metres, on the area as the C claim. In 2011, Seaborne Minerals completed a 901.0 line-kilometre airborne geophysical survey on the area. In 2013 and 2015, minor programs of soil sampling and prospecting were completed.