The Big Ben showing outcrops west of the Similkameen River, about 4 kilometres north-northeast of Allison Pass and 42 kilometres southwest of Princeton.

This showing is hosted in a section of conglomerate, arkose, tuffaceous sandstone, lithic tuff, siltstone and shale of the Cretaceous Pasayten Group. The beds strike 130 degrees and dip 70 degrees southwest. Several dykes and sills of gabbro have intruded the beds in the vicinity of the showings.

The various sulphide showings comprising this occurrence are scattered about an area 800 metres long and up to 400 metres wide, bounded by two creeks flowing eastward into the Similkameen River, Cameron (Coldwater) Creek to the north and Big Ben (Bonanza) Creek to the south. Most of the mineralization outcrops along the two creeks.

Pyrrhotite, pyrite and sphalerite, with minor arsenopyrite and chalcopyrite, occur as narrow stringers, aggregates and massive lenses, usually in faults, shears and in small breccia zones. Stibnite has also been reported. Individual breccia zones are up to 15 metres long and 3 metres wide. Stronger mineralization occurs over widths of up to 1.2 metres. A chip sample, 1.8 metres long, taken across the hangingwall of a bedding-plane fault with sphalerite, assayed 3.39 per cent zinc, and a sample from a sulphide lens, 1.8 metres long and up to 0.43 metres wide, assayed 0.3 gram per tonne gold, 34 grams per tonne silver, 0.13 per cent copper and 0.06 per cent zinc (Minister of Mines Annual Report 1959, page 121). Samples containing abundant pyrite, arsenopyrite, sphalerite and chalcopyrite, taken along Big Ben Creek, assayed 12 grams per tonne gold, 21 grams per tonne silver and 16.2 per cent arsenic (Minister of Mines Annual Report 1927, page 248).

Similar mineralization is reported to be hosted in the gabbro dykes and sills.

This occurrence has been periodically explored between 1924 and 1965.