The Pershing showing is located on a tributary of Le Sueur (Mosquito) Creek, about 1800 metres east-southeast of the confluence of American Creek and the Bear River.
In 1910, the Portland Dreadnought Mining Company carried out tunnelling and open cutting on a group of three claims which presumably covered the showing. It is not clear whether the adit on the Pershing claim (the No. 2 adit) was driven at this time or later. In 1920, Le Sueur held the Ruby Silver group over the showing and conducted further work. In 1924, Ruby Silver Mines, was formed and acquired the Ruby Silver claims (Ruby, Ruby 1, Star, Stirling, Pershing and Pershing 1) and Ruby Silver Extension claims (Ruby 2-5). The company name was changed in 1929 to Ruby Silver Copper Mines Limited. No further work was reported until 1984 when D. Brownlee acquired the Ruby Silver group and conducted an evaluation the following year. In 1986, Thios Resources Inc. acquired the property and subsequently entered into a joint venture with Adrian Resources Ltd. The joint venture conducted geological, geochemical and geophysical (VLF-EM and magnetometer) surveys on the property in 1990. During 2005 through 2010, Auramex completed programs of prospecting, geological mapping, geochemical sampling and airborne geophysical surveys on the area as the Bear River-Surprise Creek property.
The area is underlain by Hazelton Group rocks of the Upper Triassic to Lower Jurassic Unuk River Formation that are unconformably overlain to the east by the Middle Jurassic Salmon River Formation (Bulletin 58, 63). A stock of augite diorite intrudes the Unuk River Formation north of the property.
The immediate area of the showing is underlain by Unuk River Formation argillites and siltstones that are locally overlain by andesitic to dacitic volcaniclastics. A prominent north-northeast trending fault lies just west of the showing.
The No. 2 adit was driven on a quartz-carbonate vein containing blebs and disseminations of pyrite and chalcopyrite that locally form up to 10 per cent of the vein. Malachite and azurite staining is present in places (Assessment Report 20308).
