The Star Mountain occurrence is located 8 kilometres west of Anderson Lake and 5 kilometres north east of Prospector Peaks.
In the region of the Star Mountain showing, the Cadwallader and Ferguson faults transect sedimentary and volcanic rocks of the Mississippian to Jurassic Bridge River Complex and the Upper Triassic Cadwallader Group. Linear, altered serpentinite zones called the President Ultramafics, correlative with the Permian and older Shulaps Ultramafic Complex, mark faults that have controlled the emplacement of diorite of the Permian Bralorne Igneous Complex. The above sequence lies between bodies of the Jurassic to Cretaceous Coast Plutonic Complex and outlying bodies of Cretaceous to Tertiary Bendor pluton granodiorite.
The occurrence is apparently underlain by ankerite-altered ultramafic rocks (listwanite?) of the President Ultramafics, correlative with the Shulaps Ultramafic Complex. The occurrence consists of a 20-centimetre wide quartz vein related to a feldspar porphyry dike.
In 1989, a sample from the vein assayed 1.55 grams per tonne gold (Assessment Report 19604).
In 1991, prospecting and sampling by Cogema Canada Ltd. 1.8 kilometres northeast of the Star Mountain showing and 2.4 kilometres south-southwest of the Prospector Peaks (MINFILE 092JNE159) showing revealed anomalous nickel and chromium values from sheared, pyritic (quartz?)-carbonate altered ultramafic rocks. Sample 114R yielded 0.13 per cent nickel and 0.13 per cent chromium (Assessment Report 22120).
Approximately 3.2 kilometres northwest of the Star Mountain occurrence, grab samples 096R and 097R yielded 0.93 and 0.91 gram per tonne gold, respectively (Assessment Report 22120). The samples were taken from a 0.20-metre wide quartz vein in siltstone adjacent to feldspar porphyry.
In 1980, Du Pont completed a program of rock, silt and soil sampling on the area as the Pass claim. In 1983, X-Cal Resources completed a program of rock and silt sampling and geological mapping on the area as the Mac and X-Cal claims. In 1985, Hudson Bay Exploration and Development completed a program of geochemical sampling, geological mapping and a ground electromagnetic survey. In 1989 and 1990, Teck completed programs of rock, silt and soil sampling, geological mapping and a ground electromagnetic survey on the area. In 1991, Cogema completed a program of geochemical sampling and geological mapping on the area. In 2007 and 2008, airborne ZTEM surveys were completed on the area. In 2009, a MMI soil sampling program was completed. In 2011, Worthington Resources Ltd. completed a 408.5 line-kilometre airborne ZTEM survey on the area as the Royalle property.