The Bowerman occurrence is located west of Wanokana Creek, approximately 10.1 kilometres northwest of Coal Harbour.
The area is underlain by northwest-trending mafic volcanic rocks of the Upper Triassic to Lower Jurassic Bonanza Group, primarily tuff breccia, lapilli tuff and tuff, which have been intruded by granodioritic rocks of the Jurassic Island Plutonic Suite.
Locally, a mineralized zone, approximately 60 metres wide, made up of breccia, quartz and calcite is erratically mineralized with pyrite, sphalerite and galena. The description of breccia, quartz and calcite is similar to the breccia found in several areas on the Expo (MINFILE 092L 240) property, but silver-lead-zinc mineralization suggests replacement mineralization in calcareous rocks.
In 1922, a grab sample assayed 27.4 grams per tonne silver, 1.7 per cent lead, 10.0 per cent zinc, nil copper and trace gold (Minister of Mines Annual Report 1922, page 232).
The area has been explored since the early 1900s, and by 1922 an upper adit 6.4 metres long, a lower adit 13.4 metres long and several opencuts had been excavated. In 1989, Caribbean Resources Corp. completed a program of stream sediment and rock sampling and geological mapping on the area as the Wanokana property.