The McColl occurrence is located in the extreme northeastern head waters of Furry Creek, approximately 1 kilometre south of Bingham Lake and at an elevation of approximately 1380 metres.

The Britannia district is underlain by a roof pendant of mid- Mesozoic volcanic and sedimentary rocks, within the Cenozoic to Mesozoic Coast Plutonic Complex. A broad, steeply south- dipping zone of complex shear deformation and metamorphism called the Britannia shear zone, crosses the pendant in a northwest direction. The Indian River shear zone, a narrow zone of foliated rocks, is sub-parallel to the Britannia shear zone and transects the northeast part of the Britannia pendant. The deformed rocks are cut by dacite dikes and several major sets of faults. The Britannia roof pendant is one of many northwest- trending bodies within and in part metamorphosed by the Coast Plutonic Complex. The pendant is comprised of fresh to weakly metamorphosed rocks with sharp contacts against plutonic rocks, and belongs to the Lower Cretaceous Gambier Group. The Coast plutonic rocks consist of older, commonly foliated bodies ranging from diorite to granodiorite and younger quartz diorite to quartz monzonite intrusions (Squamish pluton). The plutonic rocks have produced contact metamorphic aureoles up to 100 metres wide in the Britannia pendant.

The occurrence area is underlain by a complicated interbedded succession of northwest- trending andesitic to dacitic pyroclastic rocks of the Gambier Group, which dip from 30 to 80 degrees south. The volcanic units are typically strongly sericitized and chloritized resulting in a well- developed schistosity. A complex succession of intercalated dacitic pyroclastics and rhyolite to dacite flows has been identified by diamond drilling. The stratigraphy is interpreted to be a felsic vent area, based on the observed thickening of the massive lower dacite flow/dome, a quartz feldspar porphyritic unit. The stratigraphy encountered in drill holes is composed of andesite, an upper dacite flow, dacite tuff breccia, dacite ash and lapilli tuffs, a lower dacite flow (quartz feldspar porphyry) and lower dacite ash tuffs.

Locally, a silicified felsic ash or cherty unit overlying the Watershed Dome complex of massive felsic flows with minor pyroclastics and felsic ash beds hosts arsenopyrite and pyrite mineralization.

Samples are reported to have assayed up to 2.05 grams per tonne gold (Property File - C. M. Burge [1988-09-23]: Fall Drill Program at Fleck Britannia)

The area has been historically explored in conjunction with the nearby Britannia (MINFILE 092GNW003) mine. In 1972, Anaconda performed a program of diamond drilling on the area. During 1984 through 1989, Minnova and Fleck Resources completed programs of geological mapping, rock sampling, electromagnetic surveys and diamond drilling on the area as part of the Fleck Option.