The Gar A occurrence is located on a south-trending ridge separating Angus and Hellroaring creeks, approximately 3.5 kilometres northwest of Grassy Mountain and at an elevation of 2200 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 vertical-sheeted fracture zone, approximately 40 metres wide by 120 metres long, hosts quartz veins, up to 4 centimetres wide, with pyrite, galena, chalcopyrite, sphalerite, molybdenite and rare visible gold. Limonite and iron carbonate are also reported. The zone is hosted by granite near the northern contact of the Grassy Mountain stock with Creston Formation sediments. The granite also hosts minor disseminated pyrite, galena and chalcopyrite.

In 2002, rock samples yielded up to 1.71 grams per tonne gold, 0.112 per cent copper, 2.23 per cent lead, 0.138 per cent zinc and 5.2 grams per tonne silver, whereas float samples yielded up to 11 grams per tonne gold (Assessment Report 26963).

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