The STIBNITE prospect is situated between Gwyneth Lake and the Hurley River, approximately 3.7 kilometres west-northwest of Bralorne, B.C.

The Oro claims surrounding the Stibnite prospect to the south and east (Assessment Report 9375), are underlain by Hurley Formation rocks of the Upper Triassic Cadwallader Group, consisting of sediments and volcanic aquagene breccia striking northwest and dipping southwest. These are intruded by quartz diorite stocks and hornblende porphyry dikes of the Jurassic to Tertiary Coast Plutonic Complex.

On the Oro 3 claim (Stibnite prospect), three narrow quartz-calcite veins containing minor disseminated pyrite, chalcopyrite and stibnite occur in a quartz diorite stock near the contact with Hurley sediments and volcanics. The veins average 30 centimetres in width, strike north-northwest and dip steeply west.

Grab samples assayed 12.0 grams gold per tonne and 97.4 grams silver per tonne (Assessment Report 14725). The original "stibnite" showing (on Oro 2, south of Gwyneth Lake) is hosted in Hurley volcanics and sediments near a hornblende porphyry dike. Narrow veins in shears are 60 metres long by 25 centimetres wide and contain an average of 8.9 per cent antimony. Northeast of the original showing, also on the Oro 2 claim, 2 narrow stibnite-quartz-calcite veins are hosted in quartz diorite near a felsite dike. The veins strike north-northwest, dip steeply north and average 7.5 per cent antimony over 25 centimetres for 15 metres strike length. One grab sample assayed 16.9 per cent antimony (Assessment Report 14725).

Exploration in the Gwyneth Lake area was first described by C.E. Cairnes in 1937, where a shallow shaft, two short adits and surface trenching were completed by the Golden Mitt Mining Company Ltd. In 1960, Hurley River Mines Ltd. conducted geological mapping and drilled 8 diamond drill holes.

New Congress Resources Ltd. conducted a program of geochemical soil sampling in 1981, as a follow-up to a 1979 sampling program that had revealed several gold-bearing veins. In 1983, X-Calibre Resources Ltd. instigated a program of geological mapping and rock sampling over the area. Cooke Geological Consultants ran programs of mapping, geophysics and geochemical rock and soil sampling in 1986 resulting in four strong VLF-EM anomalies. Follow-up soil sampling indicated two spot gold-arsenic anomalies, which were trenched revealing two stibnite veins. In 1988, Levon Resources initiated an airborne magnetometer and VLF-EM survey over the area, and two conductor anomalies were investigated.

In 2011, BCT Mining Corporation and partners conducted another VLF-EM survey, identifying a north-south trending anomaly and a weaker east-west trending anomaly. A magnetometer survey over the area did not reveal significant results. Cobalt One Energy Corp. conducted a program of rock and silt geochemical sampling on their Gwyneth property in 2018. One rock sample returned anomalous values of 2.11 grams per tonne gold and 22.3 grams per tonne silver (Assessment Report 37935).