This magnetite skarn lies enclosed in rosette porphyry (feldspar glomerophyric ?) sills of the Upper Triassic Karmutsen Formation (Vancouver Group). Limestone is reported to occur about 800 metres south of the skarn deposit.

Magnetite occurs in two parallel belts, conformable to the structure of the rocks, dipping east 40 to 45 degrees into the hill. It is found throughout a longitudinal distance of 95 metres, but is separated by drift into four principal exposures, varying in length from 10 to 30 metres, and up to 3.3 metres wide. The continuity of the zone is broken by a dip fault near the middle of the area and their depth has only been proved for 4.6 metres. Both footwall and hangingwall are fractured and metamorphosed almost beyond recogni- tion, being now largely made up of garnet and epidote.

The deposit is a mixture of magnetite and garnet, with the garnet being either irregularly disseminated through the magnetite or occurring as thin, elongated, lenticular, closely spaced streaks that produced a marked banding in the deposit. The deposit is thought to have originated by the replacement of tuff or tuff-breccia beds between walls of rosette porphyry, since the banded structure characteristic of tuff replacement is strongly evident.

Development work, as of 1916, consists of a series of opencuts and two short adits. A rough, but approximate, average sample of the ore on the dump contained 55.9 per cent iron, 16.0 per cent silica, 1.0 per cent sulphur, and no copper (Minister of Mines Annual Report 1902).