The Revenue prospect is on Ferguson Creek, approximately 2.5 kilometres north of its confluence with Lardeau Creek. Its precise location is uncertain, but the adits are probably close to the gossan south of Broadview Creek explored in the 1990s. The Revenue prospect was originally covered by the Baltimore, Brooklyn and Katinka claims. More recently it has been covered by the Fergi #2 claim.
The showings were located alongside the Ferguson Creek Trail in the early 1900s, and 61 metres of tunnel were driven in 1908. A second adit was driven as a crosscut for 23 metres and then followed a vein in a northwest direction for 7.6 metres in 1924. The adits are 30 metres apart. There is also an open cut below the trail.
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.
The Revenue prospect is underlain by grey and black phyllites of the Boadview Formation, quartzites of the Ajax Formation and siliceous black argillites of the Triune Formation. The rocks are near the axis of the Silver Cup Anticline and are isloclinally folded and locally highly deformed. The area has a similar structural and stratigraphic setting to the Nettie L.[082KNW100] past producer to the southeast.
The open-cut exposes a 2.4 metres wide quartz vein that cuts quartzite on or close to the crest of the anticline. The vein strikes 070 degrees east and dips at 55 degrees to the south and is crossed by numerous veinlets of sphalerite. The south adit was caved in 1955. However, the north adit was open. It was found to crosscut Broadview Formation grits and a narrow band of Ajax quartzite before entering black phyllite. The tunnel drifted along a 1.2 metres wide quartz vein on the quartzite-phyllite contact for approximately 17.0 metres without encountering appreciable sulphides. The vein strikes at 135 degrees and dips at 75 degrees to the northeast. In 1924, there was reported to be a "streak of ore" at the face and a sample from the sorted ore pile assayed 1.37 grams per tonne gold, 552 grams per tonne silver, 23.3 per cent lead and 1.8 per cent zinc.
St. Patrick Mining prospected the Ferguson Creek Trail between 1992 and 1997 and located a gossan on crushed phyllitic schist approximately 200 metres south of the junction the confluence of Broadview Creek. The gossan was trenched and found to be caused by stringers of pyrite, sphalerite and galena in a carbonate matrix. The company conducted soil geochemical programmes designed to locate extensions of the nearby True Fissure vein system on the property.
