The H.Y.M. prospect is on the east side of Silver Cup Ridge, near the headwaters of Brown Creek, which drains to the northeast into the Lardeau Creek. The H.Y.M claim is poorly located and is probably an alternate name for some other prospect.
The H.Y.M showings are poorly described, although a significant amount of development work had been done by 1911. There were two adits. The upper adit followed the vein and the lower adit was driven so as to cut the vein at a distance of 45.7 metres and at a vertical depth of 38.1 metres below surface. It had not yet reached its target in 1911. A 12.7 tonne sample was shipped from the property in 1905 and returned "$83/ton".
The H.Y.M. was later included in a large property package (Bug 2 and 6-9 claims) that surrounds a number of crown granted mineral claims. Golden Rule Resources Limited conducted a soil geochemical survey in area in 1980. 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 were 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.
Two tunnels were driven on the H.Y.M. vein. The upper adit exposed a 0.25 to 0.36 metre wide vein which is reported to average 3086 grams per tonne silver over its entire (unspecified) length.
