The Gar C (South zone) occurrence is located on a west-trending ridge of Grassy Mountain, at an elevation of approximately 2250 metres.

Regionally, the area is underlain by Mesoproterozoic rocks of the Purcell Supergroup, including the lower members up-sequence of the Aldridge, Creston and Kitchener formations. Included within the sedimentary package are primarily sills but also dikes of the gabbroic Moyie Intrusions. The quartzite-dominated turbidites of the Aldridge Formation give way to quartzites and siltstones of the Creston Formation. Granitic intrusives in the region are of two distinct ages and are very dissimilar. Proterozoic pegmatites of the Hellroaring Creek assemblage form sills, dikes, and small stocks that only intrude the Aldridge Formation. Much younger, likely Cretaceous, stocks such as the Angus Creek stock are composed of granodiorite to quartz monzonite.

Locally, a zone of quartz veining, associated with the Big Lead fault, host limonite, pyrite and rare visible gold. The veins trend approximately parallel to bedding, strike 10 to 30 degrees, dip 50 to 70 degrees to the west and vary from 1 to 20 centimetres in width.

In 2001 and 2002, the area was prospected and sampled as the Gar claims by Super Group Holdings.