The Silver Moon talc bodies are on the southeast slope of Mount Whymper, 20.2 kilometres northwest of the Red Mountain talc occurrence (082O 002). They are 2.5 kilometres southwest of the Alberta border, and 840 metres northwest of, and 270 metres above Highway 93. The occurrences were originally staked by the Banff Talc Company in about 1915 and later Crown-granted (Lot 11708). Several cuts and two short adits were driven into the talc bodies.
The irregular bodies of white talc are 10 to 20 metres high and contain irregularly distributed, sheared lenses, pods and veins of high variable proportions of quartz and dolomite. In addition, bedded dolomite forms lenses and intervals in the talc bodies. The talc bodies are at nearly the same elevation along 150 metres of the slope, near the base of horizontally bedded dolomites of the Middle Cambrian Cathedral Formation. The base of the talc is about 15 metres above quartz arenites of the Lower Cambrian Gog Group. The bodies coincide with, and perhaps are localized along zones of well developed northwest striking fracture cleavage.
The "southwest" talc body is 10 metres high (vertical) and 30 to 37 metres wide. An adit 7 metres from the southwest end of the body was driven northwesterly 9 metres. The "middle" body is 8 metres high and 23 to 29 metres northeast of the "southwest" body. The "northeast" body is 40 metres northeast of the "middle" body and up to 16 metres wide and 23 metres high; an adit was driven northwesterly 6 metres into the talc.
The "southwest" body appears to contain the highest proportion of talc, with about 10 per cent bedded dolomite lenses and locally to 10 per cent quartz pods and lenses. The talc is generally weakly translucent, frosty white with a pale greenish grey tinge on fresh surfaces. Locally, it is limonite stained and light to medium rusty orange in zones 1 metre or more wide. The talc is very strongly fractured; slickensided shears also commonly cut the talc.
Pyritic lenses are surrounded by talc at both the "southwest" and "northeast" talc bodies, 1 to 3 metres above the basal contact. The lenses are up to 13 centimetres thick and 1 metre long, and dip horizontally to 25 degrees southwest. The "southwest" talc body contains 10 per cent very fine to fine anhedral pyrite irregularly scattered along stringers and within patches. The "northeast" talc body consists of gossanous talc with patches of clear grey dolomite with 8 per cent disseminated pyrite.
