The Mount Washington Copper deposit is located on a ridge on the north side of Mount Washington, 400 metres north of the Domineer/ Lakeview occurrence (092F 116). A complete exploration history of the area and associated occurrences can be found Assessment Report 30010.

The area of the occurrence is underlain by sediments of the Upper Cretaceous Nanaimo Group, Comox Formation, which unconformably overlie mafic volcanic rocks of the Upper Triassic Vancouver Group, Karmutsen Formation. Intruding both formations is a quartz diorite stock of the Late Eocene to Early Oligocene Mount Washington Intrusive Suite (formerly Catface Intrusions - Massey, N. Personal Communication), dated at 35 million years (+/- 6 Ma) (Carson, 1960). Several later breccias have shattered all other rock types locally. The area is also cut by sub-horizontal thrust faults that control mineralization, and near-vertical faults with a lateral displacement of more than 1.0 kilometre. The Karmutsen Formation comprises basaltic massive and pillow lavas that are commonly porphyritic. The lavas grade into pillow breccias and aquagene tuffs. The overlying Comox Formation comprises fine-grained sandstone and greywacke, with interbedded siltstone. A basal conglomerate of rounded clasts of Karmutsen Formation rocks separates the formations.

The Tertiary quartz diorite stock is variably porphyritic and is centered on McKay Lake northeast of the summit of Mount Washington. Several sills and dykes of diorite, quartz diorite and quartz diorite porphyry are related to the stock.

The Mount Washington Copper deposit is considered to be a porphyry-type deposit with a later superimposed epithermal gold-copper-arsenic event (see 092F 116). Mineralization has been defined over a length of more than 750 metres, and continues further to the south as the auriferous epithermal zone of the Domineer/Lakeview occurrence.

The mineralization is contained in a 1.5 to 7.6 metre wide subhorizontal tabular zone at or near the contact of Comox Formation sediments and the "Pit diorite" sill of the Mount Washington Intrusive Suite. The zone contains a stockwork of chalcopyrite- pyrite-quartz veins, and disseminated chalcopyrite in the sediments and the sill. Low gold and silver values are associated with the veins. Bornite, covellite, realgar, orpiment, pyrrhotite, arsenopyrite, molybdenite, sphalerite and galena are present.

Between 1964 and 1967, 381,773 tonnes of ore was mined from two open pits producing 131 kilograms of gold, 7235 kilograms of silver and 3548 tonnes of copper. An estimated 305,720 tonnes grading 1.07 per cent copper remain adjacent to the open pit (W.G. Stevenson and Associates, 1970).

In 1991, Better Resources completed a program of geochemical sampling and six diamond drill holes, totalling 602 metres, to test the extensions of the mineral zone intersected by Noranda in 1989. In 2008, Blue Rock Resources completed a geological mapping and prospecting program. In 2011, Clibetre Exploration completed a program of geochemical sampling and fifteen holes, totalling 64.8 metres, of overburden drilling on former tailings located 6 kilometres to the east.