The Ophir showing is located 7 kilometres west of Vernon, east of Okanagan Lake.

In this area, west of the Okanagan Valley fault zone, volcanic and sedimentary rocks of the Devonian to Triassic Harper Ranch Group are unconformably overlain by Upper Triassic to Lower Jurassic Nicola Group sedimentary and volcanic rocks. These units are intruded by Middle Jurassic granitic rocks informally named the Terrace Creek batholith. Patches of Eocene Penticton Group volcanic rocks overlie the older rocks.

A stratiform, volcanogenic, massive to semi-massive sulphide layer is associated with Harper Ranch slaty to schistose argillite and sericitic schistose rhyolite. The minerals present in order of abundance are pyrite, chalcopyrite, sphalerite and galena. Some secondary zinc, iron and copper minerals are present. Pyrite is ubiquitous, occurring disseminated throughout the zone while chalcopyrite and sphalerite show marked zoning. Chalcopyrite occurs as massive bands and lenses, up to 3 millimetres thick; disseminated with sphalerite and galena; or occasionally disseminated in the adjoining rhyolite.

Samples of the copper-rich massive sulphides assayed 4.3 per cent copper and 7 grams per tonne silver over 0.6 metre (Geological Survey of Canada Summary Report 1931A, page 92-94).

A zinc-rich zone occurs 120 metres along strike to the southeast. Massive to disseminated sphalerite, with associated galena, pyrite and chalcopyrite, occurs in a 0.9-metre thick zone. Samples assayed up to 21 per cent zinc, 1.6 per cent copper, 2 per cent lead, 2 grams per tonne gold and 80 grams per tonne silver (Geological Survey of Canada Summary Report 1931A, page 92-94). This zone is reported to be 250 metres long, at least 60 metres wide with an average thickness of 6 metres.

Exploration work was first reported in 1923 and continued to 1928. A 33-tonne shipment in 1928 produced 3,484 grams of silver, 62 grams of gold, 360 kilograms of copper and 756 kilograms of lead.