The Zinc Creek showing occurs within a thick series of thin bedded, well-cleaved calcareous shales of the Middle Cambrian Chancellor Group. Interbedded with the shales are narrow bands of siliceous limestone 0.6 to 0.9 metre thick. Mineralization is developed within one of these bands.

An irregular lenticular pocket of quartz-calcite with bands of pyrite, arsenopyrite, sphalerite and galena replaces a siliceous limestone band about 3 metres thick. The mineralized zone rests conformably on calcareous shales which strike 115 degrees and dip 15 degrees south, into the slope of Zinc Mountain. The mineralized zone is about 2.4 metres in maximum thickness, and extends about 9.1 metres along the strike of the shales. It appears to pinch out about 3.6 metres down on the dip of the footwall. Other masses or lenses occur along strike in the same horizon.