At the Ontario showing, an adit of unknown length was driven into soft, greenish slates and argillites of the Middle Cambrian Chancellor Group, but has since been covered by talus. The showing is upstream from the Sunday (082N 053) and Empire (082N 062) occurrences, and is inferred to be a quartz vein mineralized with chalcopyrite and galena.
A copper-galena ore sample was sent to the Paris Exhibition (Minister of Mines Annual Report 1899, page 594).