The Jumbo occurrence is located between Marble and Onad creeks, approximately 600 metres east of Tofino Creeks mouth, and 24.5 kilometres northeast of Tofino, B.C.

The Deer Bay area is underlain by the pre-Jurassic Westcoast Complex, an assemblage of greenstone, limestone, diorite, granite, granodiorite and basalt porphyry. Associated with the greenstone are lenses of white to grey limestone, striking northwest and dipping steeply northeast. The greenstone has been intruded by coarse-grained, dark diorite sills.

Locally, northwest striking ribbons of limestone occur within intensely skarn-altered Westcoast Complex rocks. Pockets and veins of massive chalcopyrite and bornite occur along the limestone contacts. Minor chalcopyrite also occurs with disseminated molybdenite and powellite in skarn altered rocks above the limestone ribbons. The overall width of the zone is approximately 20 metres; individual mineralized lenses can be traced for up to 30 metres. The vertically dipping zone strikes 055 degrees west and disappears beneath overburden in both directions.

In 1980, Pawnee Oil Corp. completed 330.5 metres of drilling, over four sites, on the Pawnee Claim Group. One hole (DH 1) is reported to have intercepted visible molybdenite over a significant length between depths of 9 and 22.5 metres before entering a sequence of porphyritic andesites and an intrusive quartz dioritic stock work (Assessment Report 8106).

During 1988 through 1991, Stage Exploration Ltd., later Stag Holdings, completed programs of geochemical sampling and ground geophysical surveys on the area as part of the Deer Bay property.

Mineralized intercepts in a drill hole, from 8.5 to 30.1 metres, averaged 0.08 per cent molybdenite and 0.04 per cent copper (Prospectus: Stag Explorations Limited, Dec.7, 1988).