The U & I occurrence is on a ridge in alpine terrain at 2367 metres elevation. It is at the head of Cup Creek, which flows into Lardeau Creek approximately 7.0 kilometres upstream from Ferguson. It is near the north end of Silver Cup Ridge, about 1.5 kilometres northwest of Triune Mountain. The U & I (L.7589) tenure is northwest of the Okanagan (L.9127) and Enderby (L.9128) [082KNW024] but close enough to them and the Winslow (L.8680) and Gladhand (L.8681) [082KNW025], and Alice (L.7440) [082KNW165] for them to be worked as a single property.

The U & I showings were developed by means of adits and open cuts prior to 1914. They were later explored by Mrs. Jowett in the 1920s. The U & I tenure was brought into the Winslow Group, by Winslow Gold Corporation, in the early 1980s and at that time was treated as part of that property.

The Trout Lake area is underlain by a thick succession of sedimentary and volcanic rocks of the Badshot Formation and Lardeau Group near the northern end of the Kootenay arc, an arcuate, north to northwest trending belt of Paleozoic and Mesozoic strata that is now classified as a distinct, pericratonic, terrane. The arc rocks are bordered by Precambrian quartzite in the east and they young to the west, where they are bounded by Jurassic-age intrusive complexes. They were deformed during the Antler orogeny in Devonian-Mississippian time and refolded and faulted during the Columbian orogeny, in the Middle Jurassic. A large panel, the "Selkirk allochthon", was later offset to the northeast by dip-slip motion along the Columbia River Fault.

The Badshot Formation is composed of a thick Cambrian limestone that is a distinctive marker horizon in the Trout Lake area. It is underlain by Hamill Group quartzite and it is overlain by a younger assemblage of limestone, calcareous, graphitic and siliceous argillite and siltstone, sandstone, quartzite and conglomerate, and also mafic volcanic flows, tuffs and breccias, all of which belong to the Lardeau Group. The rocks are isoclinally folded and intensely deformed, but only weakly metamorphosed. They occur as intercalated beds of marble, quartzite and grey, green and black phyllite and schist. Fyles and Eastwood (EMPR BULL 45) subdivided the group into six formations (Index, Triune, Ajax, Sharon Creek, Jowett and Broadview) of which the lowermost (Index) and uppermost (Broadview) are the most widespread. The Triune (siliceous argillite), Ajax (quartzite) and Sharon Creek (siliceous argillite) are restricted to the Trout Lake area. The Jowett is a mafic volcanic unit.

The U & I claim covers a small section of Lardeau group stratigraphy on the southwest side of the Silver Cup anticline. From northeast to southwest it is underlain by Ajax Formation quartzite, black siliceous argillite of the Sharon Creek Formation and green, gritty metasandstone of the Broadview Formation. The Sharon Creek rocks have been faulted against those of the Broadview. The rocks are isoclinally folded and they are locally highly deformed and schistose. Bedding and schistocity strike to the northwest and dip moderately to the northeast. The Ajax quartzite is a well defined marker unit that early prospectors referred to as the "Cromwell dyke". On the U & I property, greenish grey phyllites and schists contain numerous quartz "inclusions", as stringers and gash-veins that follow the schistocity of the countryrock. However, there are also several discordant veins. The principal mineralized vein is 0.3 metre wide, has a strike of 010 and dips at 38 degrees to the east. It was explored by open cuts and a prospect shaft prior to 1914. At that time, a sample from a small pile of sorted rocks from the shaft area assayed gold 61.7 grams per tonne gold. There was no silver assay reported. Gunning (GSC MEM 161) located several prospect pits and other old workings south and east of the southwest corner post of the U & I claim. One covered a vein in carbonate altered chlorite schist. The vein had a strike of 060 and a 65 degree dip to the southeast. Dump samples showed that it contained vuggy white quartz, pyrite, galena, chalcopyrite and sphalerite. Elsewhere, he noted veins oriented nearly parallel to bedding. They appeared to be irregular in width and locally mineralized with lenses of pyrite.