The property is underlain by north east trending metavolcanics of the Cambrian to Ordovician part of the Eagle Bay Formation. The metavolcanics consist of bedded andesitic fragmentals and flows, siliceous tuffites with some rhyolite ignimbrites, tuffs, and frag- mentals. The andesite and tuffite contain abundant siliceous and/or cherty layers. Small amounts of pyrite, pyrrhotite, chalcopyrite and sphalerite are disseminated in the rocks. Northeast north trending quartz feldspar porphyry dykes cut the metavolcanics.

Numerous zones of massive galena, sphalerite, pyrrhotite, pyrite and magnetite with minor chalcopyrite occur in conformable chlorite and/or epidote rich layers. Layers of massive sulphides are 4 metres or more.

The BC zone covers an area measuring about 1400 metres by 400 metres in an east-northeast trend with 15 degrees to 30 degrees dips to the northwest. This zone lies about 1 kilometre northeast of the Zinc zone (082M 138). The best drill intersection (Diamond Drill Hole Harry 1-85) assayed 1.2 per cent zinc, 1.0 grams per tonne silver and .08 per cent copper over 0.84 metres (Assessment Report 14681). A drillhole (Diamond Drill Hole Harry 3-85), 250 metres south west of the first, intersected 0.3 per cent zinc, 7.9 grams per tonne silver and 0.16 per cent copper over 0.27 metre. Indicated reserves are 181,000 tonnes grading 54.9 grams per tonne silver, 0.2 per cent copper, 1.0 per cent lead and 2.72 per cent zinc (Assessment Report 13381, page 17; Property File - Black, 1976).