The CF group (C-Zone) occurrence is located on Mount Sicker, approximately 4.5 kilometres west of Westholme.

The area is located within the Cowichan uplift and is underlain mainly by andesitic to rhyolitic volcanics of the McLaughlin Ridge and Myra Formations (Sicker Group). The local stratigraphy is disrupted by folding, faulting (pre-Triassic as well as Tertiary), intrusions of gabbro and diabase sills and dikes (informally known as the Mount Hall gabbro) that are coeval with the Upper Triassic Karmutsen Formation (Vancouver Group).

Locally, a 1.7 metre wide quartz vein containing 5 per cent chalcopyrite is hosted by gabbros with common quartz-calcite veinlets and epidote alteration.

In 1972, Duncanex Resources completed a program of prospecting, geological mapping and a ground electromagnetic survey on the area, then known as the CF group. From 1978 through 1980, S.E.R.E.M. Limited completed programs of geological mapping, ground geophysical surveys, soil sampling and two diamond drill holes, SRM 13 and 14, on an area of strong geophysical responses. The core was not assayed. From 1988 through 1990, Minnova completed programs of geochemical sampling. In 2008, Westridge Resources completed a program of airborne geophysical surveys on the area.