The Abrahamson prospect is near the junction of North (Ferguson) Creek and South Lardeau Creek, near the community of Ferguson. The Abrahamson Group originally included the North Star, Crystal and Queen of the Hills tenures. The tenures were worked in the early 1890s; however, their precise location is uncertain.

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 Abrahamson area is poorly located. However, it is underlain by metasedimentary and metavolcanic rocks of the Lardeau Group, on the southwest side of the Cup Creek Fault. The rocks are isoclinally and cut by a pronounced axial plane cleavage that strikes to the northwest and dips at a moderate to steep dip to the northeast.

There is little known about the workings. However, in 1893, considerable work was reported and a series of ore values were quoted. The Crystal showings were described as grading "$19/ton" gold and 3428 grams per tonne silver. The North Star showings produced "$53/ton" gold and 788 grams per tonne silver and the Queen of the Hills contained "$16/ton" gold and 5246 grams per tonne silver. The following year, the same values were quoted for the North Star and Queen of the Hill.